Related
Closed. This question is opinion-based. It is not currently accepting answers.
Want to improve this question? Update the question so it can be answered with facts and citations by editing this post.
Closed last year.
The community reviewed whether to reopen this question last year and left it closed:
Original close reason(s) were not resolved
Improve this question
What is your favorite method to handle errors in Bash?
The best example of handling errors I have found on the web was written by William Shotts, Jr at http://www.linuxcommand.org.
He suggests using the following function for error handling in Bash:
#!/bin/bash
# A slicker error handling routine
# I put a variable in my scripts named PROGNAME which
# holds the name of the program being run. You can get this
# value from the first item on the command line ($0).
# Reference: This was copied from <http://www.linuxcommand.org/wss0150.php>
PROGNAME=$(basename $0)
function error_exit
{
# ----------------------------------------------------------------
# Function for exit due to fatal program error
# Accepts 1 argument:
# string containing descriptive error message
# ----------------------------------------------------------------
echo "${PROGNAME}: ${1:-"Unknown Error"}" 1>&2
exit 1
}
# Example call of the error_exit function. Note the inclusion
# of the LINENO environment variable. It contains the current
# line number.
echo "Example of error with line number and message"
error_exit "$LINENO: An error has occurred."
Do you have a better error handling routine that you use in Bash scripts?
Use a trap!
tempfiles=( )
cleanup() {
rm -f "${tempfiles[#]}"
}
trap cleanup 0
error() {
local parent_lineno="$1"
local message="$2"
local code="${3:-1}"
if [[ -n "$message" ]] ; then
echo "Error on or near line ${parent_lineno}: ${message}; exiting with status ${code}"
else
echo "Error on or near line ${parent_lineno}; exiting with status ${code}"
fi
exit "${code}"
}
trap 'error ${LINENO}' ERR
...then, whenever you create a temporary file:
temp_foo="$(mktemp -t foobar.XXXXXX)"
tempfiles+=( "$temp_foo" )
and $temp_foo will be deleted on exit, and the current line number will be printed. (set -e will likewise give you exit-on-error behavior, though it comes with serious caveats and weakens code's predictability and portability).
You can either let the trap call error for you (in which case it uses the default exit code of 1 and no message) or call it yourself and provide explicit values; for instance:
error ${LINENO} "the foobar failed" 2
will exit with status 2, and give an explicit message.
Alternatively shopt -s extdebug and give the first lines of the trap a little modification to trap all non-zero exit codes across the board (mind set -e non-error non-zero exit codes):
error() {
local last_exit_status="$?"
local parent_lineno="$1"
local message="${2:-(no message ($last_exit_status))}"
local code="${3:-$last_exit_status}"
# ... continue as above
}
trap 'error ${LINENO}' ERR
shopt -s extdebug
This then is also "compatible" with set -eu.
That's a fine solution. I just wanted to add
set -e
as a rudimentary error mechanism. It will immediately stop your script if a simple command fails. I think this should have been the default behavior: since such errors almost always signify something unexpected, it is not really 'sane' to keep executing the following commands.
Reading all the answers on this page inspired me a lot.
So, here's my hint:
file content: lib.trap.sh
lib_name='trap'
lib_version=20121026
stderr_log="/dev/shm/stderr.log"
#
# TO BE SOURCED ONLY ONCE:
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
if test "${g_libs[$lib_name]+_}"; then
return 0
else
if test ${#g_libs[#]} == 0; then
declare -A g_libs
fi
g_libs[$lib_name]=$lib_version
fi
#
# MAIN CODE:
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
set -o pipefail # trace ERR through pipes
set -o errtrace # trace ERR through 'time command' and other functions
set -o nounset ## set -u : exit the script if you try to use an uninitialised variable
set -o errexit ## set -e : exit the script if any statement returns a non-true return value
exec 2>"$stderr_log"
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
#
# FUNCTION: EXIT_HANDLER
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
function exit_handler ()
{
local error_code="$?"
test $error_code == 0 && return;
#
# LOCAL VARIABLES:
# ------------------------------------------------------------------
#
local i=0
local regex=''
local mem=''
local error_file=''
local error_lineno=''
local error_message='unknown'
local lineno=''
#
# PRINT THE HEADER:
# ------------------------------------------------------------------
#
# Color the output if it's an interactive terminal
test -t 1 && tput bold; tput setf 4 ## red bold
echo -e "\n(!) EXIT HANDLER:\n"
#
# GETTING LAST ERROR OCCURRED:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
#
# Read last file from the error log
# ------------------------------------------------------------------
#
if test -f "$stderr_log"
then
stderr=$( tail -n 1 "$stderr_log" )
rm "$stderr_log"
fi
#
# Managing the line to extract information:
# ------------------------------------------------------------------
#
if test -n "$stderr"
then
# Exploding stderr on :
mem="$IFS"
local shrunk_stderr=$( echo "$stderr" | sed 's/\: /\:/g' )
IFS=':'
local stderr_parts=( $shrunk_stderr )
IFS="$mem"
# Storing information on the error
error_file="${stderr_parts[0]}"
error_lineno="${stderr_parts[1]}"
error_message=""
for (( i = 3; i <= ${#stderr_parts[#]}; i++ ))
do
error_message="$error_message "${stderr_parts[$i-1]}": "
done
# Removing last ':' (colon character)
error_message="${error_message%:*}"
# Trim
error_message="$( echo "$error_message" | sed -e 's/^[ \t]*//' | sed -e 's/[ \t]*$//' )"
fi
#
# GETTING BACKTRACE:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
_backtrace=$( backtrace 2 )
#
# MANAGING THE OUTPUT:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
local lineno=""
regex='^([a-z]{1,}) ([0-9]{1,})$'
if [[ $error_lineno =~ $regex ]]
# The error line was found on the log
# (e.g. type 'ff' without quotes wherever)
# --------------------------------------------------------------
then
local row="${BASH_REMATCH[1]}"
lineno="${BASH_REMATCH[2]}"
echo -e "FILE:\t\t${error_file}"
echo -e "${row^^}:\t\t${lineno}\n"
echo -e "ERROR CODE:\t${error_code}"
test -t 1 && tput setf 6 ## white yellow
echo -e "ERROR MESSAGE:\n$error_message"
else
regex="^${error_file}\$|^${error_file}\s+|\s+${error_file}\s+|\s+${error_file}\$"
if [[ "$_backtrace" =~ $regex ]]
# The file was found on the log but not the error line
# (could not reproduce this case so far)
# ------------------------------------------------------
then
echo -e "FILE:\t\t$error_file"
echo -e "ROW:\t\tunknown\n"
echo -e "ERROR CODE:\t${error_code}"
test -t 1 && tput setf 6 ## white yellow
echo -e "ERROR MESSAGE:\n${stderr}"
# Neither the error line nor the error file was found on the log
# (e.g. type 'cp ffd fdf' without quotes wherever)
# ------------------------------------------------------
else
#
# The error file is the first on backtrace list:
# Exploding backtrace on newlines
mem=$IFS
IFS='
'
#
# Substring: I keep only the carriage return
# (others needed only for tabbing purpose)
IFS=${IFS:0:1}
local lines=( $_backtrace )
IFS=$mem
error_file=""
if test -n "${lines[1]}"
then
array=( ${lines[1]} )
for (( i=2; i<${#array[#]}; i++ ))
do
error_file="$error_file ${array[$i]}"
done
# Trim
error_file="$( echo "$error_file" | sed -e 's/^[ \t]*//' | sed -e 's/[ \t]*$//' )"
fi
echo -e "FILE:\t\t$error_file"
echo -e "ROW:\t\tunknown\n"
echo -e "ERROR CODE:\t${error_code}"
test -t 1 && tput setf 6 ## white yellow
if test -n "${stderr}"
then
echo -e "ERROR MESSAGE:\n${stderr}"
else
echo -e "ERROR MESSAGE:\n${error_message}"
fi
fi
fi
#
# PRINTING THE BACKTRACE:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
test -t 1 && tput setf 7 ## white bold
echo -e "\n$_backtrace\n"
#
# EXITING:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
test -t 1 && tput setf 4 ## red bold
echo "Exiting!"
test -t 1 && tput sgr0 # Reset terminal
exit "$error_code"
}
trap exit_handler EXIT # ! ! ! TRAP EXIT ! ! !
trap exit ERR # ! ! ! TRAP ERR ! ! !
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
#
# FUNCTION: BACKTRACE
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
function backtrace
{
local _start_from_=0
local params=( "$#" )
if (( "${#params[#]}" >= "1" ))
then
_start_from_="$1"
fi
local i=0
local first=false
while caller $i > /dev/null
do
if test -n "$_start_from_" && (( "$i" + 1 >= "$_start_from_" ))
then
if test "$first" == false
then
echo "BACKTRACE IS:"
first=true
fi
caller $i
fi
let "i=i+1"
done
}
return 0
Example of usage:
file content: trap-test.sh
#!/bin/bash
source 'lib.trap.sh'
echo "doing something wrong now .."
echo "$foo"
exit 0
Running:
bash trap-test.sh
Output:
doing something wrong now ..
(!) EXIT HANDLER:
FILE: trap-test.sh
LINE: 6
ERROR CODE: 1
ERROR MESSAGE:
foo: unassigned variable
BACKTRACE IS:
1 main trap-test.sh
Exiting!
As you can see from the screenshot below, the output is colored and the error message comes in the used language.
An equivalent alternative to "set -e" is
set -o errexit
It makes the meaning of the flag somewhat clearer than just "-e".
Random addition: to temporarily disable the flag, and return to the default (of continuing execution regardless of exit codes), just use
set +e
echo "commands run here returning non-zero exit codes will not cause the entire script to fail"
echo "false returns 1 as an exit code"
false
set -e
This precludes proper error handling mentioned in other responses, but is quick & effective (just like bash).
Inspired by the ideas presented here, I have developed a readable and convenient way to handle errors in bash scripts in my bash boilerplate project.
By simply sourcing the library, you get the following out of the box (i.e. it will halt execution on any error, as if using set -e thanks to a trap on ERR and some bash-fu):
There are some extra features that help handle errors, such as try and catch, or the throw keyword, that allows you to break execution at a point to see the backtrace. Plus, if the terminal supports it, it spits out powerline emojis, colors parts of the output for great readability, and underlines the method that caused the exception in the context of the line of code.
The downside is - it's not portable - the code works in bash, probably >= 4 only (but I'd imagine it could be ported with some effort to bash 3).
The code is separated into multiple files for better handling, but I was inspired by the backtrace idea from the answer above by Luca Borrione.
To read more or take a look at the source, see GitHub:
https://github.com/niieani/bash-oo-framework#error-handling-with-exceptions-and-throw
I prefer something really easy to call. So I use something that looks a little complicated, but is easy to use. I usually just copy-and-paste the code below into my scripts. An explanation follows the code.
#This function is used to cleanly exit any script. It does this displaying a
# given error message, and exiting with an error code.
function error_exit {
echo
echo "$#"
exit 1
}
#Trap the killer signals so that we can exit with a good message.
trap "error_exit 'Received signal SIGHUP'" SIGHUP
trap "error_exit 'Received signal SIGINT'" SIGINT
trap "error_exit 'Received signal SIGTERM'" SIGTERM
#Alias the function so that it will print a message with the following format:
#prog-name(#line#): message
#We have to explicitly allow aliases, we do this because they make calling the
#function much easier (see example).
shopt -s expand_aliases
alias die='error_exit "Error ${0}(#`echo $(( $LINENO - 1 ))`):"'
I usually put a call to the cleanup function in side the error_exit function, but this varies from script to script so I left it out. The traps catch the common terminating signals and make sure everything gets cleaned up. The alias is what does the real magic. I like to check everything for failure. So in general I call programs in an "if !" type statement. By subtracting 1 from the line number the alias will tell me where the failure occurred. It is also dead simple to call, and pretty much idiot proof. Below is an example (just replace /bin/false with whatever you are going to call).
#This is an example useage, it will print out
#Error prog-name (#1): Who knew false is false.
if ! /bin/false ; then
die "Who knew false is false."
fi
Another consideration is the exit code to return. Just "1" is pretty standard, although there are a handful of reserved exit codes that bash itself uses, and that same page argues that user-defined codes should be in the range 64-113 to conform to C/C++ standards.
You might also consider the bit vector approach that mount uses for its exit codes:
0 success
1 incorrect invocation or permissions
2 system error (out of memory, cannot fork, no more loop devices)
4 internal mount bug or missing nfs support in mount
8 user interrupt
16 problems writing or locking /etc/mtab
32 mount failure
64 some mount succeeded
OR-ing the codes together allows your script to signal multiple simultaneous errors.
I use the following trap code, it also allows errors to be traced through pipes and 'time' commands
#!/bin/bash
set -o pipefail # trace ERR through pipes
set -o errtrace # trace ERR through 'time command' and other functions
function error() {
JOB="$0" # job name
LASTLINE="$1" # line of error occurrence
LASTERR="$2" # error code
echo "ERROR in ${JOB} : line ${LASTLINE} with exit code ${LASTERR}"
exit 1
}
trap 'error ${LINENO} ${?}' ERR
I've used
die() {
echo $1
kill $$
}
before; i think because 'exit' was failing for me for some reason. The above defaults seem like a good idea, though.
This has served me well for a while now. It prints error or warning messages in red, one line per parameter, and allows an optional exit code.
# Custom errors
EX_UNKNOWN=1
warning()
{
# Output warning messages
# Color the output red if it's an interactive terminal
# #param $1...: Messages
test -t 1 && tput setf 4
printf '%s\n' "$#" >&2
test -t 1 && tput sgr0 # Reset terminal
true
}
error()
{
# Output error messages with optional exit code
# #param $1...: Messages
# #param $N: Exit code (optional)
messages=( "$#" )
# If the last parameter is a number, it's not part of the messages
last_parameter="${messages[#]: -1}"
if [[ "$last_parameter" =~ ^[0-9]*$ ]]
then
exit_code=$last_parameter
unset messages[$((${#messages[#]} - 1))]
fi
warning "${messages[#]}"
exit ${exit_code:-$EX_UNKNOWN}
}
Not sure if this will be helpful to you, but I modified some of the suggested functions here in order to include the check for the error (exit code from prior command) within it.
On each "check" I also pass as a parameter the "message" of what the error is for logging purposes.
#!/bin/bash
error_exit()
{
if [ "$?" != "0" ]; then
log.sh "$1"
exit 1
fi
}
Now to call it within the same script (or in another one if I use export -f error_exit) I simply write the name of the function and pass a message as parameter, like this:
#!/bin/bash
cd /home/myuser/afolder
error_exit "Unable to switch to folder"
rm *
error_exit "Unable to delete all files"
Using this I was able to create a really robust bash file for some automated process and it will stop in case of errors and notify me (log.sh will do that)
This trick is useful for missing commands or functions. The name of the missing function (or executable) will be passed in $_
function handle_error {
status=$?
last_call=$1
# 127 is 'command not found'
(( status != 127 )) && return
echo "you tried to call $last_call"
return
}
# Trap errors.
trap 'handle_error "$_"' ERR
This function has been serving me rather well recently:
action () {
# Test if the first parameter is non-zero
# and return straight away if so
if test $1 -ne 0
then
return $1
fi
# Discard the control parameter
# and execute the rest
shift 1
"$#"
local status=$?
# Test the exit status of the command run
# and display an error message on failure
if test ${status} -ne 0
then
echo Command \""$#"\" failed >&2
fi
return ${status}
}
You call it by appending 0 or the last return value to the name of the command to run, so you can chain commands without having to check for error values. With this, this statement block:
command1 param1 param2 param3...
command2 param1 param2 param3...
command3 param1 param2 param3...
command4 param1 param2 param3...
command5 param1 param2 param3...
command6 param1 param2 param3...
Becomes this:
action 0 command1 param1 param2 param3...
action $? command2 param1 param2 param3...
action $? command3 param1 param2 param3...
action $? command4 param1 param2 param3...
action $? command5 param1 param2 param3...
action $? command6 param1 param2 param3...
<<<Error-handling code here>>>
If any of the commands fail, the error code is simply passed to the end of the block. I find it useful when you don't want subsequent commands to execute if an earlier one failed, but you also don't want the script to exit straight away (for example, inside a loop).
Sometimes set -e , trap ERR ,set -o ,set -o pipefail and set -o errtrace not work properly because they attempt to add automatic error detection to the shell. This does not work well in practice.
In my opinion, instead of using set -e and other stuffs, you should write your own error checking code. If you wise to use set -e, be aware of potential gotchas.
To avoid Error while running the code you can use exec 1>/dev/null or exec 2>/dev/null
/dev/null in Linux is a null device file. This will discard anything written to it and will return EOF on reading. you can use this at end of the command
For try/catch you can use && or || to achieve Similar behaviour
use can use && like this
{ # try
command &&
# your command
} || {
# catch exception
}
or you can use if else :
if [[ Condition ]]; then
# if true
else
# if false
fi
$? show output of the last command ,it return 1 or 0
Using trap is not always an option. For example, if you're writing some kind of re-usable function that needs error handling and that can be called from any script (after sourcing the file with helper functions), that function cannot assume anything about exit time of the outer script, which makes using traps very difficult. Another disadvantage of using traps is bad composability, as you risk overwriting previous trap that might be set earlier up in the caller chain.
There is a little trick that can be used to do proper error handling without traps. As you may already know from other answers, set -e doesn't work inside commands if you use || operator after them, even if you run them in a subshell; e.g., this wouldn't work:
#!/bin/sh
# prints:
#
# --> outer
# --> inner
# ./so_1.sh: line 16: some_failed_command: command not found
# <-- inner
# <-- outer
set -e
outer() {
echo '--> outer'
(inner) || {
exit_code=$?
echo '--> cleanup'
return $exit_code
}
echo '<-- outer'
}
inner() {
set -e
echo '--> inner'
some_failed_command
echo '<-- inner'
}
outer
But || operator is needed to prevent returning from the outer function before cleanup. The trick is to run the inner command in background, and then immediately wait for it. The wait builtin will return the exit code of the inner command, and now you're using || after wait, not the inner function, so set -e works properly inside the latter:
#!/bin/sh
# prints:
#
# --> outer
# --> inner
# ./so_2.sh: line 27: some_failed_command: command not found
# --> cleanup
set -e
outer() {
echo '--> outer'
inner &
wait $! || {
exit_code=$?
echo '--> cleanup'
return $exit_code
}
echo '<-- outer'
}
inner() {
set -e
echo '--> inner'
some_failed_command
echo '<-- inner'
}
outer
Here is the generic function that builds upon this idea. It should work in all POSIX-compatible shells if you remove local keywords, i.e. replace all local x=y with just x=y:
# [CLEANUP=cleanup_cmd] run cmd [args...]
#
# `cmd` and `args...` A command to run and its arguments.
#
# `cleanup_cmd` A command that is called after cmd has exited,
# and gets passed the same arguments as cmd. Additionally, the
# following environment variables are available to that command:
#
# - `RUN_CMD` contains the `cmd` that was passed to `run`;
# - `RUN_EXIT_CODE` contains the exit code of the command.
#
# If `cleanup_cmd` is set, `run` will return the exit code of that
# command. Otherwise, it will return the exit code of `cmd`.
#
run() {
local cmd="$1"; shift
local exit_code=0
local e_was_set=1; if ! is_shell_attribute_set e; then
set -e
e_was_set=0
fi
"$cmd" "$#" &
wait $! || {
exit_code=$?
}
if [ "$e_was_set" = 0 ] && is_shell_attribute_set e; then
set +e
fi
if [ -n "$CLEANUP" ]; then
RUN_CMD="$cmd" RUN_EXIT_CODE="$exit_code" "$CLEANUP" "$#"
return $?
fi
return $exit_code
}
is_shell_attribute_set() { # attribute, like "x"
case "$-" in
*"$1"*) return 0 ;;
*) return 1 ;;
esac
}
Example of usage:
#!/bin/sh
set -e
# Source the file with the definition of `run` (previous code snippet).
# Alternatively, you may paste that code directly here and comment the next line.
. ./utils.sh
main() {
echo "--> main: $#"
CLEANUP=cleanup run inner "$#"
echo "<-- main"
}
inner() {
echo "--> inner: $#"
sleep 0.5; if [ "$1" = 'fail' ]; then
oh_my_god_look_at_this
fi
echo "<-- inner"
}
cleanup() {
echo "--> cleanup: $#"
echo " RUN_CMD = '$RUN_CMD'"
echo " RUN_EXIT_CODE = $RUN_EXIT_CODE"
sleep 0.3
echo '<-- cleanup'
return $RUN_EXIT_CODE
}
main "$#"
Running the example:
$ ./so_3 fail; echo "exit code: $?"
--> main: fail
--> inner: fail
./so_3: line 15: oh_my_god_look_at_this: command not found
--> cleanup: fail
RUN_CMD = 'inner'
RUN_EXIT_CODE = 127
<-- cleanup
exit code: 127
$ ./so_3 pass; echo "exit code: $?"
--> main: pass
--> inner: pass
<-- inner
--> cleanup: pass
RUN_CMD = 'inner'
RUN_EXIT_CODE = 0
<-- cleanup
<-- main
exit code: 0
The only thing that you need to be aware of when using this method is that all modifications of Shell variables done from the command you pass to run will not propagate to the calling function, because the command runs in a subshell.
I have a script that I'd like people to source, but optionally so. So they can run it with or without sourcing it, it's up to them.
e.g. The following should both work:
$ . test.sh
$ test.sh
The problem is, test.sh contains exit statements if correct args aren't passed in. If someone sources the script, then the exit commands exit the terminal!
I've done a bit of research and see from this StackOverflow post that I could detect if it's being sourced, and do something different, but what would that something different be?
The normal way to exit from a sourced script is simply to return (optionally adding the desired exit code) outside of any function. Assuming that when run as a command we have the -e flag set, this will also exit from a shell program:
#!/bin/sh -eu
if [ $# = 0 ]
then
echo "Usage $0 <argument>" >&2
return 1
fi
If we're running without -e, we might be able to return || exit instead.
There may be better ways to do this, but here's a sample script showing how I got this to work:
bparks#home
$ set | grep TESTVAR
bparks#home
$ ./test.sh
Outputs some useful information to the console. Please pass one arg.
bparks#home
$ set | grep TESTVAR
bparks#home
$ . ./test.sh
Outputs some useful information to the console. Please pass one arg.
bparks#home
$ set | grep TESTVAR
bparks#home
$ ./test.sh asdf
export TESTVAR=me
bparks#home
$ set | grep TESTVAR
bparks#home
$ . ./test.sh asdf
bparks#home
$ set | grep TESTVAR
TESTVAR=me
bparks#home
$
test.sh
#!/usr/bin/env bash
# store if we're sourced or not in a variable
(return 0 2>/dev/null) && SOURCED=1 || SOURCED=0
exitIfNotSourced(){
[[ "$SOURCED" != "0" ]] || exit;
}
showHelp(){
IT=$(cat <<EOF
Outputs some useful information to the console. Please pass one arg.
EOF
)
echo "$IT"
}
# Show help if no args supplied - works if sourced or not sourced
if [ -z "$1" ]
then
showHelp
exitIfNotSourced;
return;
fi
# your main script follows
# this sample shows exporting a variable if sourced,
# and outputting this to stdout if not sourced
if [ "$SOURCED" == "1" ]
then
export TESTVAR=me
else
echo "export TESTVAR=me"
fi
Checkout this answer for better description and porper solution.
And here is how it is used in docker-entrypoint.sh in official Mysql image:
# check to see if this file is being run or sourced from another script
_is_sourced() {
# https://unix.stackexchange.com/a/215279
[ "${#FUNCNAME[#]}" -ge 2 ] \
&& [ "${FUNCNAME[0]}" = '_is_sourced' ] \
&& [ "${FUNCNAME[1]}" = 'source' ]
}
This is (or was, at least) a common pattern in Ruby, but I can't figure out how to do it in Zsh or Bash.
Let's suppose I have a shell function called "whoosiwhatsit", and I want to override it in a specific project, while still keeping the original available under a different name.
If I didn't know better, I might try creating an alias to point to whoosiwhatsit, and then create a new "whoosiwhatsit" function that uses the alias. Of course that work, since the alias will refer to the new function instead.
Is there any way to accomplish what I'm talking about?
Aliases are pretty weak. You can do this with functions though. Consider the following tools:
#!/usr/bin/env bash
PS4=':${#FUNCNAME[#]}:${BASH_SOURCE}:$LINENO+'
rename_function() {
local orig_definition new_definition new_name retval
retval=$1; shift
orig_definition=$(declare -f "$1") || return 1
new_name="${1}_"
while declare -f "$new_name" >/dev/null 2>&1; do
new_name+="_"
done
new_definition=${orig_definition/"$1"/"$new_name"}
eval "$new_definition" || return
unset -f "$orig_definition"
printf -v "$retval" %s "$new_name"
}
# usage: shadow_function target_name shadowing_func [...]
# ...replaces target_name with a function which will call:
# shadowing_func target_renamed_to_this number_of_args_in_[...] [...] "$#"
shadow_function() {
local shadowed_func eval_code shadowed_name shadowing_func shadowed_func_renamed
shadowed_name=$1; shift
shadowing_func=$1; shift
rename_function shadowed_func_renamed "$shadowed_name" || return
if (( $# )); then printf -v const_args '%q ' "$#"; else const_args=''; fi
printf -v eval_code '%q() { %q %q %s "$#"; }' \
"$shadowed_name" "$shadowing_func" "$shadowed_func_renamed" "$# $const_args"
eval "$eval_code"
}
...and the following example application of those tools:
whoosiwhatsit() { echo "This is the original implementation"; }
override_in_directory() {
local shadowed_func=$1; shift
local override_cmd_len=$1; shift
local override_dir=$1; shift
local -a override_cmd=( )
local i
for (( i=1; i<override_cmd_len; i++)); do : "$1"
override_cmd+=( "$1" ); shift
done
: PWD="$PWD" override_dir="$override_dir" shadowed_func="$shadowed_func"
: override_args "${override_args[#]}"
if [[ $PWD = $override_dir || $PWD = $override_dir/* ]]; then
[[ $- = *x* ]] && declare -f shadowed_func >&2 # if in debugging mode
"${override_cmd[#]}"
else
"$shadowed_func" "$#"
fi
}
ask_the_user_first() {
local shadowed_func=$1; shift;
shift # ignore static-argument-count parameter
if [[ -t 0 ]]; then
read -r -p "Press ctrl+c if you are unsure, or enter if you are"
fi
"$shadowed_func" "$#"
}
shadow_function whoosiwhatsit ask_the_user_first
shadow_function whoosiwhatsit \
override_in_directory /tmp echo "Not in the /tmp!!!"
shadow_function whoosiwhatsit \
override_in_directory /home echo "Don't try this at home"
The end result is a whoosiwhatsit function that asks the user before it does anything when its stdin is a TTY, and aborts (with different messages) when run under either /tmp or /home.
That said, I don't condone this practice. Consider the above provided as an intellectual exercise. :)
In bash, there is a built-in variable called BASH_ALIASES that is an associative array containing the current aliases. The semantics are a bit inconsistent when you update it (RTM!) but if you restrict yourself to reading BASH_ALIASES, you should be able to write yourself a shell function that implements alias chaining.
It's common and well supported to create a single level of overrides through functions that optionally invoke their overridden builtin or command:
# Make all cd commands auto-exit on failure
cd() { builtin cd "$#" || exit; }
# Make all ssh commands verbose
ssh() { command ssh -vv "$#"; }
It doesn't chain beyond the one link, but it's completely POSIX and often works better in practice than trying to write Ruby in Bash.
* the wording of the question is terrible, sorry!
I have some bash functions I create
test() {echo "hello wold"}
test2() {echo "hello wold"}
Then in my .bashrc I source the file that has the above function . ~/my_bash_scripts/testFile
In the terminal I can run test and get hello world.
is there a way for me to add parent variable that holds all my functions together. For example personal test, personal test2.
Similar to every other gem out there, I downloaded a tweeter one. All it's methods are followed by the letter t, as in t status to write a status, instead of just status
You are asking about writing a command-line program. Just a simple one here:
#!/usr/bin/env bash
if [[ $# -eq 0 ]]; then
echo "no command specified"
exit
elif [[ $# -gt 1 ]]; then
echo "only one argument expected"
exit
fi
case "$1" in
test)
echo "hello, this is test1"
;;
test2)
echo "hello, this is test2"
;;
*)
echo "unknown command: $1"
;;
esac
Then save it and make it an executable by run chmod +x script.sh, and in your .bashrc file, add alias personal="/fullpath/to/the/script.sh".
This is just very basic and simple example using bash and of course you can use any language you like, e.g. Python, Ruby, Node e.t.c.
Use arguments to determine final outputs.
You can use "$#" for number of arguments.
For example,
if [ $# -ne 2 ]; then
# TODO: print usage
exit 1
fi
Above code exits if arguments not euqal to 2.
So below bash program
echo $#
with
thatscript foo bar baz quux
will output 4.
Finally you can combine words to determine what to put stdout.
If you want to flag some functions as your personal functions; no, there is no explicit way to do that, and essentially, all shell functions belong to yourself (although some may be defined by your distro maintainer or system administrator as system-wide defaults).
What you could do is collect the output from declare -F at the very top of your personal shell startup file; any function not in that list is your personal function.
SYSFNS=$(declare -F | awk '{ a[++i] = $3 }
END { for (n=1; n<=i; n++) printf "%s%s", (n>1? ":" : ""), a[n] }')
This generates a variable SYSFNS which contains a colon-separated list of system-declared functions.
With that defined, you can check out which functions are yours:
myfns () {
local fun
declare -F |
while read -r _ _ fun; do
case :$SYSFNS: in *:"$fun":*) continue;; esac
echo "$fun"
done
}
Closed. This question is opinion-based. It is not currently accepting answers.
Want to improve this question? Update the question so it can be answered with facts and citations by editing this post.
Closed last year.
The community reviewed whether to reopen this question last year and left it closed:
Original close reason(s) were not resolved
Improve this question
What is your favorite method to handle errors in Bash?
The best example of handling errors I have found on the web was written by William Shotts, Jr at http://www.linuxcommand.org.
He suggests using the following function for error handling in Bash:
#!/bin/bash
# A slicker error handling routine
# I put a variable in my scripts named PROGNAME which
# holds the name of the program being run. You can get this
# value from the first item on the command line ($0).
# Reference: This was copied from <http://www.linuxcommand.org/wss0150.php>
PROGNAME=$(basename $0)
function error_exit
{
# ----------------------------------------------------------------
# Function for exit due to fatal program error
# Accepts 1 argument:
# string containing descriptive error message
# ----------------------------------------------------------------
echo "${PROGNAME}: ${1:-"Unknown Error"}" 1>&2
exit 1
}
# Example call of the error_exit function. Note the inclusion
# of the LINENO environment variable. It contains the current
# line number.
echo "Example of error with line number and message"
error_exit "$LINENO: An error has occurred."
Do you have a better error handling routine that you use in Bash scripts?
Use a trap!
tempfiles=( )
cleanup() {
rm -f "${tempfiles[#]}"
}
trap cleanup 0
error() {
local parent_lineno="$1"
local message="$2"
local code="${3:-1}"
if [[ -n "$message" ]] ; then
echo "Error on or near line ${parent_lineno}: ${message}; exiting with status ${code}"
else
echo "Error on or near line ${parent_lineno}; exiting with status ${code}"
fi
exit "${code}"
}
trap 'error ${LINENO}' ERR
...then, whenever you create a temporary file:
temp_foo="$(mktemp -t foobar.XXXXXX)"
tempfiles+=( "$temp_foo" )
and $temp_foo will be deleted on exit, and the current line number will be printed. (set -e will likewise give you exit-on-error behavior, though it comes with serious caveats and weakens code's predictability and portability).
You can either let the trap call error for you (in which case it uses the default exit code of 1 and no message) or call it yourself and provide explicit values; for instance:
error ${LINENO} "the foobar failed" 2
will exit with status 2, and give an explicit message.
Alternatively shopt -s extdebug and give the first lines of the trap a little modification to trap all non-zero exit codes across the board (mind set -e non-error non-zero exit codes):
error() {
local last_exit_status="$?"
local parent_lineno="$1"
local message="${2:-(no message ($last_exit_status))}"
local code="${3:-$last_exit_status}"
# ... continue as above
}
trap 'error ${LINENO}' ERR
shopt -s extdebug
This then is also "compatible" with set -eu.
That's a fine solution. I just wanted to add
set -e
as a rudimentary error mechanism. It will immediately stop your script if a simple command fails. I think this should have been the default behavior: since such errors almost always signify something unexpected, it is not really 'sane' to keep executing the following commands.
Reading all the answers on this page inspired me a lot.
So, here's my hint:
file content: lib.trap.sh
lib_name='trap'
lib_version=20121026
stderr_log="/dev/shm/stderr.log"
#
# TO BE SOURCED ONLY ONCE:
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
if test "${g_libs[$lib_name]+_}"; then
return 0
else
if test ${#g_libs[#]} == 0; then
declare -A g_libs
fi
g_libs[$lib_name]=$lib_version
fi
#
# MAIN CODE:
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
set -o pipefail # trace ERR through pipes
set -o errtrace # trace ERR through 'time command' and other functions
set -o nounset ## set -u : exit the script if you try to use an uninitialised variable
set -o errexit ## set -e : exit the script if any statement returns a non-true return value
exec 2>"$stderr_log"
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
#
# FUNCTION: EXIT_HANDLER
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
function exit_handler ()
{
local error_code="$?"
test $error_code == 0 && return;
#
# LOCAL VARIABLES:
# ------------------------------------------------------------------
#
local i=0
local regex=''
local mem=''
local error_file=''
local error_lineno=''
local error_message='unknown'
local lineno=''
#
# PRINT THE HEADER:
# ------------------------------------------------------------------
#
# Color the output if it's an interactive terminal
test -t 1 && tput bold; tput setf 4 ## red bold
echo -e "\n(!) EXIT HANDLER:\n"
#
# GETTING LAST ERROR OCCURRED:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
#
# Read last file from the error log
# ------------------------------------------------------------------
#
if test -f "$stderr_log"
then
stderr=$( tail -n 1 "$stderr_log" )
rm "$stderr_log"
fi
#
# Managing the line to extract information:
# ------------------------------------------------------------------
#
if test -n "$stderr"
then
# Exploding stderr on :
mem="$IFS"
local shrunk_stderr=$( echo "$stderr" | sed 's/\: /\:/g' )
IFS=':'
local stderr_parts=( $shrunk_stderr )
IFS="$mem"
# Storing information on the error
error_file="${stderr_parts[0]}"
error_lineno="${stderr_parts[1]}"
error_message=""
for (( i = 3; i <= ${#stderr_parts[#]}; i++ ))
do
error_message="$error_message "${stderr_parts[$i-1]}": "
done
# Removing last ':' (colon character)
error_message="${error_message%:*}"
# Trim
error_message="$( echo "$error_message" | sed -e 's/^[ \t]*//' | sed -e 's/[ \t]*$//' )"
fi
#
# GETTING BACKTRACE:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
_backtrace=$( backtrace 2 )
#
# MANAGING THE OUTPUT:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
local lineno=""
regex='^([a-z]{1,}) ([0-9]{1,})$'
if [[ $error_lineno =~ $regex ]]
# The error line was found on the log
# (e.g. type 'ff' without quotes wherever)
# --------------------------------------------------------------
then
local row="${BASH_REMATCH[1]}"
lineno="${BASH_REMATCH[2]}"
echo -e "FILE:\t\t${error_file}"
echo -e "${row^^}:\t\t${lineno}\n"
echo -e "ERROR CODE:\t${error_code}"
test -t 1 && tput setf 6 ## white yellow
echo -e "ERROR MESSAGE:\n$error_message"
else
regex="^${error_file}\$|^${error_file}\s+|\s+${error_file}\s+|\s+${error_file}\$"
if [[ "$_backtrace" =~ $regex ]]
# The file was found on the log but not the error line
# (could not reproduce this case so far)
# ------------------------------------------------------
then
echo -e "FILE:\t\t$error_file"
echo -e "ROW:\t\tunknown\n"
echo -e "ERROR CODE:\t${error_code}"
test -t 1 && tput setf 6 ## white yellow
echo -e "ERROR MESSAGE:\n${stderr}"
# Neither the error line nor the error file was found on the log
# (e.g. type 'cp ffd fdf' without quotes wherever)
# ------------------------------------------------------
else
#
# The error file is the first on backtrace list:
# Exploding backtrace on newlines
mem=$IFS
IFS='
'
#
# Substring: I keep only the carriage return
# (others needed only for tabbing purpose)
IFS=${IFS:0:1}
local lines=( $_backtrace )
IFS=$mem
error_file=""
if test -n "${lines[1]}"
then
array=( ${lines[1]} )
for (( i=2; i<${#array[#]}; i++ ))
do
error_file="$error_file ${array[$i]}"
done
# Trim
error_file="$( echo "$error_file" | sed -e 's/^[ \t]*//' | sed -e 's/[ \t]*$//' )"
fi
echo -e "FILE:\t\t$error_file"
echo -e "ROW:\t\tunknown\n"
echo -e "ERROR CODE:\t${error_code}"
test -t 1 && tput setf 6 ## white yellow
if test -n "${stderr}"
then
echo -e "ERROR MESSAGE:\n${stderr}"
else
echo -e "ERROR MESSAGE:\n${error_message}"
fi
fi
fi
#
# PRINTING THE BACKTRACE:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
test -t 1 && tput setf 7 ## white bold
echo -e "\n$_backtrace\n"
#
# EXITING:
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
test -t 1 && tput setf 4 ## red bold
echo "Exiting!"
test -t 1 && tput sgr0 # Reset terminal
exit "$error_code"
}
trap exit_handler EXIT # ! ! ! TRAP EXIT ! ! !
trap exit ERR # ! ! ! TRAP ERR ! ! !
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
#
# FUNCTION: BACKTRACE
#
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~##
function backtrace
{
local _start_from_=0
local params=( "$#" )
if (( "${#params[#]}" >= "1" ))
then
_start_from_="$1"
fi
local i=0
local first=false
while caller $i > /dev/null
do
if test -n "$_start_from_" && (( "$i" + 1 >= "$_start_from_" ))
then
if test "$first" == false
then
echo "BACKTRACE IS:"
first=true
fi
caller $i
fi
let "i=i+1"
done
}
return 0
Example of usage:
file content: trap-test.sh
#!/bin/bash
source 'lib.trap.sh'
echo "doing something wrong now .."
echo "$foo"
exit 0
Running:
bash trap-test.sh
Output:
doing something wrong now ..
(!) EXIT HANDLER:
FILE: trap-test.sh
LINE: 6
ERROR CODE: 1
ERROR MESSAGE:
foo: unassigned variable
BACKTRACE IS:
1 main trap-test.sh
Exiting!
As you can see from the screenshot below, the output is colored and the error message comes in the used language.
An equivalent alternative to "set -e" is
set -o errexit
It makes the meaning of the flag somewhat clearer than just "-e".
Random addition: to temporarily disable the flag, and return to the default (of continuing execution regardless of exit codes), just use
set +e
echo "commands run here returning non-zero exit codes will not cause the entire script to fail"
echo "false returns 1 as an exit code"
false
set -e
This precludes proper error handling mentioned in other responses, but is quick & effective (just like bash).
Inspired by the ideas presented here, I have developed a readable and convenient way to handle errors in bash scripts in my bash boilerplate project.
By simply sourcing the library, you get the following out of the box (i.e. it will halt execution on any error, as if using set -e thanks to a trap on ERR and some bash-fu):
There are some extra features that help handle errors, such as try and catch, or the throw keyword, that allows you to break execution at a point to see the backtrace. Plus, if the terminal supports it, it spits out powerline emojis, colors parts of the output for great readability, and underlines the method that caused the exception in the context of the line of code.
The downside is - it's not portable - the code works in bash, probably >= 4 only (but I'd imagine it could be ported with some effort to bash 3).
The code is separated into multiple files for better handling, but I was inspired by the backtrace idea from the answer above by Luca Borrione.
To read more or take a look at the source, see GitHub:
https://github.com/niieani/bash-oo-framework#error-handling-with-exceptions-and-throw
I prefer something really easy to call. So I use something that looks a little complicated, but is easy to use. I usually just copy-and-paste the code below into my scripts. An explanation follows the code.
#This function is used to cleanly exit any script. It does this displaying a
# given error message, and exiting with an error code.
function error_exit {
echo
echo "$#"
exit 1
}
#Trap the killer signals so that we can exit with a good message.
trap "error_exit 'Received signal SIGHUP'" SIGHUP
trap "error_exit 'Received signal SIGINT'" SIGINT
trap "error_exit 'Received signal SIGTERM'" SIGTERM
#Alias the function so that it will print a message with the following format:
#prog-name(#line#): message
#We have to explicitly allow aliases, we do this because they make calling the
#function much easier (see example).
shopt -s expand_aliases
alias die='error_exit "Error ${0}(#`echo $(( $LINENO - 1 ))`):"'
I usually put a call to the cleanup function in side the error_exit function, but this varies from script to script so I left it out. The traps catch the common terminating signals and make sure everything gets cleaned up. The alias is what does the real magic. I like to check everything for failure. So in general I call programs in an "if !" type statement. By subtracting 1 from the line number the alias will tell me where the failure occurred. It is also dead simple to call, and pretty much idiot proof. Below is an example (just replace /bin/false with whatever you are going to call).
#This is an example useage, it will print out
#Error prog-name (#1): Who knew false is false.
if ! /bin/false ; then
die "Who knew false is false."
fi
Another consideration is the exit code to return. Just "1" is pretty standard, although there are a handful of reserved exit codes that bash itself uses, and that same page argues that user-defined codes should be in the range 64-113 to conform to C/C++ standards.
You might also consider the bit vector approach that mount uses for its exit codes:
0 success
1 incorrect invocation or permissions
2 system error (out of memory, cannot fork, no more loop devices)
4 internal mount bug or missing nfs support in mount
8 user interrupt
16 problems writing or locking /etc/mtab
32 mount failure
64 some mount succeeded
OR-ing the codes together allows your script to signal multiple simultaneous errors.
I use the following trap code, it also allows errors to be traced through pipes and 'time' commands
#!/bin/bash
set -o pipefail # trace ERR through pipes
set -o errtrace # trace ERR through 'time command' and other functions
function error() {
JOB="$0" # job name
LASTLINE="$1" # line of error occurrence
LASTERR="$2" # error code
echo "ERROR in ${JOB} : line ${LASTLINE} with exit code ${LASTERR}"
exit 1
}
trap 'error ${LINENO} ${?}' ERR
I've used
die() {
echo $1
kill $$
}
before; i think because 'exit' was failing for me for some reason. The above defaults seem like a good idea, though.
This has served me well for a while now. It prints error or warning messages in red, one line per parameter, and allows an optional exit code.
# Custom errors
EX_UNKNOWN=1
warning()
{
# Output warning messages
# Color the output red if it's an interactive terminal
# #param $1...: Messages
test -t 1 && tput setf 4
printf '%s\n' "$#" >&2
test -t 1 && tput sgr0 # Reset terminal
true
}
error()
{
# Output error messages with optional exit code
# #param $1...: Messages
# #param $N: Exit code (optional)
messages=( "$#" )
# If the last parameter is a number, it's not part of the messages
last_parameter="${messages[#]: -1}"
if [[ "$last_parameter" =~ ^[0-9]*$ ]]
then
exit_code=$last_parameter
unset messages[$((${#messages[#]} - 1))]
fi
warning "${messages[#]}"
exit ${exit_code:-$EX_UNKNOWN}
}
Not sure if this will be helpful to you, but I modified some of the suggested functions here in order to include the check for the error (exit code from prior command) within it.
On each "check" I also pass as a parameter the "message" of what the error is for logging purposes.
#!/bin/bash
error_exit()
{
if [ "$?" != "0" ]; then
log.sh "$1"
exit 1
fi
}
Now to call it within the same script (or in another one if I use export -f error_exit) I simply write the name of the function and pass a message as parameter, like this:
#!/bin/bash
cd /home/myuser/afolder
error_exit "Unable to switch to folder"
rm *
error_exit "Unable to delete all files"
Using this I was able to create a really robust bash file for some automated process and it will stop in case of errors and notify me (log.sh will do that)
This trick is useful for missing commands or functions. The name of the missing function (or executable) will be passed in $_
function handle_error {
status=$?
last_call=$1
# 127 is 'command not found'
(( status != 127 )) && return
echo "you tried to call $last_call"
return
}
# Trap errors.
trap 'handle_error "$_"' ERR
This function has been serving me rather well recently:
action () {
# Test if the first parameter is non-zero
# and return straight away if so
if test $1 -ne 0
then
return $1
fi
# Discard the control parameter
# and execute the rest
shift 1
"$#"
local status=$?
# Test the exit status of the command run
# and display an error message on failure
if test ${status} -ne 0
then
echo Command \""$#"\" failed >&2
fi
return ${status}
}
You call it by appending 0 or the last return value to the name of the command to run, so you can chain commands without having to check for error values. With this, this statement block:
command1 param1 param2 param3...
command2 param1 param2 param3...
command3 param1 param2 param3...
command4 param1 param2 param3...
command5 param1 param2 param3...
command6 param1 param2 param3...
Becomes this:
action 0 command1 param1 param2 param3...
action $? command2 param1 param2 param3...
action $? command3 param1 param2 param3...
action $? command4 param1 param2 param3...
action $? command5 param1 param2 param3...
action $? command6 param1 param2 param3...
<<<Error-handling code here>>>
If any of the commands fail, the error code is simply passed to the end of the block. I find it useful when you don't want subsequent commands to execute if an earlier one failed, but you also don't want the script to exit straight away (for example, inside a loop).
Sometimes set -e , trap ERR ,set -o ,set -o pipefail and set -o errtrace not work properly because they attempt to add automatic error detection to the shell. This does not work well in practice.
In my opinion, instead of using set -e and other stuffs, you should write your own error checking code. If you wise to use set -e, be aware of potential gotchas.
To avoid Error while running the code you can use exec 1>/dev/null or exec 2>/dev/null
/dev/null in Linux is a null device file. This will discard anything written to it and will return EOF on reading. you can use this at end of the command
For try/catch you can use && or || to achieve Similar behaviour
use can use && like this
{ # try
command &&
# your command
} || {
# catch exception
}
or you can use if else :
if [[ Condition ]]; then
# if true
else
# if false
fi
$? show output of the last command ,it return 1 or 0
Using trap is not always an option. For example, if you're writing some kind of re-usable function that needs error handling and that can be called from any script (after sourcing the file with helper functions), that function cannot assume anything about exit time of the outer script, which makes using traps very difficult. Another disadvantage of using traps is bad composability, as you risk overwriting previous trap that might be set earlier up in the caller chain.
There is a little trick that can be used to do proper error handling without traps. As you may already know from other answers, set -e doesn't work inside commands if you use || operator after them, even if you run them in a subshell; e.g., this wouldn't work:
#!/bin/sh
# prints:
#
# --> outer
# --> inner
# ./so_1.sh: line 16: some_failed_command: command not found
# <-- inner
# <-- outer
set -e
outer() {
echo '--> outer'
(inner) || {
exit_code=$?
echo '--> cleanup'
return $exit_code
}
echo '<-- outer'
}
inner() {
set -e
echo '--> inner'
some_failed_command
echo '<-- inner'
}
outer
But || operator is needed to prevent returning from the outer function before cleanup. The trick is to run the inner command in background, and then immediately wait for it. The wait builtin will return the exit code of the inner command, and now you're using || after wait, not the inner function, so set -e works properly inside the latter:
#!/bin/sh
# prints:
#
# --> outer
# --> inner
# ./so_2.sh: line 27: some_failed_command: command not found
# --> cleanup
set -e
outer() {
echo '--> outer'
inner &
wait $! || {
exit_code=$?
echo '--> cleanup'
return $exit_code
}
echo '<-- outer'
}
inner() {
set -e
echo '--> inner'
some_failed_command
echo '<-- inner'
}
outer
Here is the generic function that builds upon this idea. It should work in all POSIX-compatible shells if you remove local keywords, i.e. replace all local x=y with just x=y:
# [CLEANUP=cleanup_cmd] run cmd [args...]
#
# `cmd` and `args...` A command to run and its arguments.
#
# `cleanup_cmd` A command that is called after cmd has exited,
# and gets passed the same arguments as cmd. Additionally, the
# following environment variables are available to that command:
#
# - `RUN_CMD` contains the `cmd` that was passed to `run`;
# - `RUN_EXIT_CODE` contains the exit code of the command.
#
# If `cleanup_cmd` is set, `run` will return the exit code of that
# command. Otherwise, it will return the exit code of `cmd`.
#
run() {
local cmd="$1"; shift
local exit_code=0
local e_was_set=1; if ! is_shell_attribute_set e; then
set -e
e_was_set=0
fi
"$cmd" "$#" &
wait $! || {
exit_code=$?
}
if [ "$e_was_set" = 0 ] && is_shell_attribute_set e; then
set +e
fi
if [ -n "$CLEANUP" ]; then
RUN_CMD="$cmd" RUN_EXIT_CODE="$exit_code" "$CLEANUP" "$#"
return $?
fi
return $exit_code
}
is_shell_attribute_set() { # attribute, like "x"
case "$-" in
*"$1"*) return 0 ;;
*) return 1 ;;
esac
}
Example of usage:
#!/bin/sh
set -e
# Source the file with the definition of `run` (previous code snippet).
# Alternatively, you may paste that code directly here and comment the next line.
. ./utils.sh
main() {
echo "--> main: $#"
CLEANUP=cleanup run inner "$#"
echo "<-- main"
}
inner() {
echo "--> inner: $#"
sleep 0.5; if [ "$1" = 'fail' ]; then
oh_my_god_look_at_this
fi
echo "<-- inner"
}
cleanup() {
echo "--> cleanup: $#"
echo " RUN_CMD = '$RUN_CMD'"
echo " RUN_EXIT_CODE = $RUN_EXIT_CODE"
sleep 0.3
echo '<-- cleanup'
return $RUN_EXIT_CODE
}
main "$#"
Running the example:
$ ./so_3 fail; echo "exit code: $?"
--> main: fail
--> inner: fail
./so_3: line 15: oh_my_god_look_at_this: command not found
--> cleanup: fail
RUN_CMD = 'inner'
RUN_EXIT_CODE = 127
<-- cleanup
exit code: 127
$ ./so_3 pass; echo "exit code: $?"
--> main: pass
--> inner: pass
<-- inner
--> cleanup: pass
RUN_CMD = 'inner'
RUN_EXIT_CODE = 0
<-- cleanup
<-- main
exit code: 0
The only thing that you need to be aware of when using this method is that all modifications of Shell variables done from the command you pass to run will not propagate to the calling function, because the command runs in a subshell.