Using the script below I want to be able to get the IP address that is outputted at the end of it and then ping it.
#!/usr/local/bin/bash
echo -n "Enter server number:"
read userinput
lookupip="d $userinput"
if [[ $userinput -lt 0 || $userinput -gt 9999 ]] #checks that the input is within the desired range
then
echo "Input outside acceptable range."
else
#grep gets just the IP address
$lookupip | grep -E -o '(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)' | sed '1 ! d'
I can't figure out how to do this with the output:
> or >> filename | xargs ping
as using " or ` around the grep command (or putting it in a variable like so:
ipgrep=$(grepcommand)
ipgrep=`grepcommand`
or variables doesn't seem to work.
Derp, I only had to add:
| xargs ping -c 1
after:
sed '1 ! d'
Related
I have a text file with host names and IP addresses like so (one IP and one host name per row). The IP addresses and host names can be separated by a spaces and/or a pipe, and the host name may be before or after the IP address
10.10.10.10 HW-DL11_C023
11.11.11.11 HW-DL11_C024
10.10.10.13 | HW-DL12_C023
11.11.11.12 | HW-DL12_C024
HW-DL13_C023 11.10.10.10
HW-DL13_C024 21.11.11.11
HW-DL14_C023 | 11.10.10.10
HW-DL14_C024 | 21.11.11.11
The script below should be able to ping hosts with a common denominator e.g. DL13 (there are two devices and it will ping only those two). What am I doing wrong, as I simply can`t make it work?
The script is in the same directory as the data; I don`t get errors, and everything is formatted. The server is Linux.
pingme () {
hostfile="/home/rex/u128789/hostfile.txt"
IFS= mapfile -t hosts < <(cat $hostfile)
for host in "${hosts[#]}"; do
match=$(echo "$host" | grep -o "\-$1_" | sed 's/-//' | sed 's/_//')
if [[ "$match" = "$1" ]]; then
hostname=$(echo "$host" | awk '{print $2}')
ping -c1 -W1 $(echo "$host" | awk '{print $1}') > /dev/null
if [[ $? = 0 ]]; then
echo "$hostname is alive"
elif [[ $? = 1 ]]; then
echo "$hostname is dead"
fi
fi
done
}
Try adding these two lines to your code:
pingme () {
hostfile="/home/rex/u128789/hostfile.txt"
IFS= mapfile -t hosts < <(cat $hostfile)
for host in "${hosts[#]}"; do
echo "Hostname: $host" # <-------- ADD THIS LINE -------
match=$(echo "$host" | grep -o "\-$1_" | sed 's/-//' | sed 's/_//')
echo "...matched with $match" # <-------- ADD THIS LINE -------
if [[ "$match" = "$1" ]]; then
hostname=$(echo "$host" | awk '{print $2}')
ping -c1 -W1 $(echo "$host" | awk '{print $1}') > /dev/null
if [[ $? = 0 ]]; then
echo "$hostname is alive"
elif [[ $? = 1 ]]; then
echo "$hostname is dead"
fi
fi
done
}
Then when you run it, you should see a list of your hosts, at least.
If you don't then you're not reading your file successfully.
If you do, there's a problem in your per-host logic.
Congratulations! You've divided your problem into two smaller problems. Once you know which half has the problem, keep dividing the problem in half until the smallest possible problem is staring you in the face. You'll probably know the solution at that point. If not, add your findings to the question and we'll help out from there.
The original code doesn't handle the pipe separator or the possibly reversed hostname and IP address in the input file. It also makes a lot of unnecessary use of external programs (grep, sed, ...).
Try this:
# Enable extended glob patterns - e.g. +(pattern-list)
shopt -s extglob
function pingme
{
local -r host_denom=$1
local -r hostfile=$HOME/u128789/hostfile.txt
local ipaddr host tmp
# (Add '|' to the usual characters in IFS)
while IFS=$'| \t\n' read -r ipaddr host ; do
# Swap host and IP address if necessary
if [[ $host == +([0-9]).+([0-9]).+([0-9]).+([0-9]) ]] ; then
tmp=$host
host=$ipaddr
ipaddr=$tmp
fi
# Ping the host if its name contains the "denominator"
if [[ $host == *-"$host_denom"_* ]] ; then
if ping -c1 -W1 -- "$ipaddr" >/dev/null ; then
printf '%s is alive\n' "$host"
else
printf '%s is dead\n' "$host"
fi
fi
done < "$hostfile"
return 0
}
pingme DL13
The final line (call the pingme function) is just an example, but it's essential to make the code do something.
REX, you need to be more specific about your what IP's you are trying to get from this example. You also don't ping enough times IMO and your script is case sensitive checking the string (not major). Anyway,
First, check that your input and output is working correctly, in this example I'm just reading and printing, if this doesn't work fix permissions etc :
file="/tmp/hostfile.txt"
while IFS= read -r line ;do
echo $line
done < "${file}"
Next, instead of a function first try to make it work as a script, in this example I manually set "match" to DL13, then I read each line (like before) and (1) match on $match, if found I remove the '|', and then read the line into an array of 2. if the first array item is an a IP (contains periods) set it as the IP the other as hostname, else set the opposite. Then run the ping test.
# BASH4+ Example:
file="/tmp/hostfile.txt"
match="dl13"
while IFS= read -r line ;do
# -- check for matching string (e.g. dl13 --
[[ "${line,,}" =~ "${match,,}" ]] || continue
# -- We found a match, split out host/ip into vars --
line=$(echo ${line//|})
IFS=' ' read -r -a items <<< "$line"
if [[ "${items[0]}" =~ '.' ]] ;then
host="${items[1]}" ; ip="${items[0]}"
else
host="${items[0]}" ; ip="${items[1]}"
fi
# -- Ping test --
ping -q -c3 "${ip}" > /dev/null
if [ $? -eq 0 ] ;then
echo "$host is alive!"
else
echo "$host is toast!"
fi
done < "${file}"
I have just started with bash scripting and there is a small problem which I have to solve to go on:
I'm getting an IPv6 address in this format:
1080::8:800:200C:417A
Now I want to convert the short into the long IPv6 form like: 1080:0:0:0:8:800:200C:417A
Is there a regex expression or something similar to convert that?
I am working on a docker container which runs on CentOS.
It isn't a regex, but it is 'something similar' and it does the job: (tested with python3.5.1)
>>> import ipaddress
>>> x = '1080::8:800:200C:417A'
>>> y = ipaddress.ip_address(x)
>>> y.exploded
'1080:0000:0000:0000:0008:0800:200c:417a'
>>>
Reference:
https://docs.python.org/3/library/ipaddress.html
#!/bin/bash
echo "enter the ip address:"
read s
if [[ $s =~ ^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$ ]]; then
echo -e '\E[47;31m'"\033[1mIPv6 Format\033[0m"
echo -n "The IPv6 Address Expanded Form:"
EXPANDED=`sipcalc $s | fgrep Expand | cut -d '-' -f 2`
echo -e "\033[32m $EXPANDED\033[0m"
echo -n "IPv6 address Compress Form:"
Compress=`sipcalc $s | fgrep Comp | cut -d '-' -f 2`
echo -e "\033[32m$Compress\033[0m"
echo -n "Address Type of IPv6:"
type=`sipcalc $s | fgrep type | cut -d '-' -f 2,3,4`
comment=`sipcalc $s | fgrep Comment | cut -d '-' -f 2`
echo -e "\033[32m $type$comment\033[0m"
else
echo -e '\E[37;44m'"\033[1mNOT VALID IPv6 address\033[0m"
fi
This is my code for ipv6 validation.U will get the expanded form of ip using "sipcalc".but you should do some grep and cut commands
Here is how I decompress IPv6 address.
#!/bin/bash
decompress_ipv6_address() {
# How many hextets are there
num_hextets=${addr//[^:]/}
num_hextets=${#num_hextets}
# Fix up beginning and end
[[ $addr =~ ^:: ]] && addr='0'$addr
[[ $addr =~ ::$ ]] && addr=$addr'0'
# Create additional hextets
additional_hextets=':'
for (( i=$num_hextets; $i<8; i++ ))
do
additional_hextets=$additional_hextets'0:'
done
# Insert additional hextets (replace ::)
addr=${addr/::/$additional_hextets}
}
I'm trying to make a simple bash script that will iterate through a text file containing IP addresses,
ping them one time, and see if they are alive or not.
This is my work so far:
#!/bin/bash
for ip in $(cat ips.txt); do
if [[ "1" == "$(ping -c 1 $ip | grep 'packets transmitted' | cut -d ' ' -f 4)"]]
echo $ip
fi
done
Any Suggestions?
Thanks!
This seems to work:
#!/bin/bash
for ip in $(cat ips.txt); do
if [ "1" == "$(ping -c 1 $ip | grep 'packets transmitted' | cut -d ' ' -f 4)" ]; then
echo $ip
fi
done
You needed the ; then after the if [ ... ] statement (same thing goes for elif, not else), and a space between the last bracket of the statement and the statement's contents. Also this appears to work fine with just single brackets, and this may be more portable (see here).
Works on Bash 4.2.47
Yes. You can use a newline instead of ; if you like, but you always need the then keyword.
if [ "1" == "$(ping -c 1 $ip | grep 'packets transmitted' | cut -d ' ' -f 4)" ]
then echo $ip
fi
# or
if [ "1" == "$(ping -c 1 $ip | grep 'packets transmitted' | cut -d ' ' -f 4)" ]
then
echo $ip
fi
I'm writing a script to run a grep for an input, create a file list and grep that file list in a separate directory and print the results.
echo "enter term"
read term
grep -rc "$term" /prod/directory1 | grep -v ":0" | sed -s 's%:[0-9]*%%' > file_list.txt
grep -rl --file=file_list.txt /tmp/directory2 > results.txt
but i would like to add an if statement that will identify if the $term is equal to a value in the first column of another file, and then set a new variable to the corresponding value in column 2 of that file.
echo "enter term"
read term
for i in products.txt; do
if [[ $term = $i ]]; then
var2 = $2
echo "product code set to: "$var2
else
var2 = 0
echo "product code set to 0."
fi
done
grep -rc "$term" /prod/directory1 | grep -v ":0" | sed -s 's%:[0-9]*%%' > file_list.txt
if [[ ! $var2 = 0 ]] ; then
grep -rc "var2" /prod/directory1 | grep -v ":0" | sed -s 's%:[0-9]*%%' >> file_list.txt
sed -s 's%.properties%%' file_list.txt | sort -u > file_list.txt
grep -rl --file=file_list.txt /tmp/directory2 > results.txt
the new grep will return results with .properties at the end, so I remove them and also any duplicate files from the list. Below is a sample for products.txt
Product_1 productCode_1
Product_2 productCode_2
Product_3 productCode_3
I would like the script to identify whether $term is in column one of that file, and then set $var2 equal to the corresponding productCode in column two. I believe once that variable is set everything else will work out nicely but right now it fails at:
for i in products.txt; do
if [[$term = $i ]]; then
var2 = $2
Thanks in advance for the assistance, I'm relatively new to bash scripting so I apologize in advance for my ineptitude.
Try:
var2=$(awk -v term="Product_2" '$1==term{print $2}' products.txt)
Change Product_2 to read from another variable, if required.
I am checking to see if a process on a remote server has been killed. The code I'm using is:
if [ `ssh -t -t -i id_dsa headless#remoteserver.com "ps -auxwww |grep pipeline| wc -l" | sed -e 's/^[ \t]*//'` -lt 3 ]
then
echo "PIPELINE STOPPED SUCCESSFULLY"
exit 0
else
echo "PIPELINE WAS NOT STOPPED SUCCESSFULLY"
exit 1
fi
However when I execute this I get:
: integer expression expected
PIPELINE WAS NOT STOPPED SUCCESSFULLY
1
The actual value returned is "1" with no whitespace. I checked that by:
vim <(ssh -t -t -i id_dsa headless#remoteserver.com "ps -auxwww |grep pipeline| wc -l" | sed -e 's/^[ \t]*//')
and then ":set list" which showed only the integer and a line feed as the returned value.
I'm at a loss here as to why this is not working.
If the output of the ssh command is truly just an integer preceded by optional tabs, then you shouldn't need the sed command; the shell will strip the leading and/or trailing whitespace as unnecessary before using it as an operand for the -lt operator.
if [ $(ssh -tti id_dsa headless#remoteserver.com "ps -auxwww | grep -c pipeline") -lt 3 ]; then
It is possible that result of the ssh is not the same when you run it manually as when it runs in the shell. You might try saving it in a variable so you can output it before testing it in your script:
result=$( ssh -tti id_dsa headless#remoteserver.com "ps -auxwww | grep -c pipeline" )
if [ $result -lt 3 ];
The return value you get is not entirely a digit. Maybe some shell-metacharacter/linefeed/whatever gets into your way here:
#!/bin/bash
var=$(ssh -t -t -i id_dsa headless#remoteserver.com "ps auxwww |grep -c pipeline")
echo $var
# just to prove my point here
# Remove all digits, and look wether there is a rest -> then its not integer
test -z "$var" -o -n "`echo $var | tr -d '[0-9]'`" && echo not-integer
# get out all the digits to use them for the arithmetic comparison
var2=$(grep -o "[0-9]" <<<"$var")
echo $var2
if [[ $var2 -lt 3 ]]
then
echo "PIPELINE STOPPED SUCCESSFULLY"
exit 0
else
echo "PIPELINE WAS NOT STOPPED SUCCESSFULLY"
exit 1
fi
As user mbratch noticed I was getting a "\r" in the returned value in addition to the expected "\n". So I changed my sed script so that it stripped out the "\r" instead of the whitespace (which chepner pointed out was unnecessary).
sed -e 's/\r*$//'