awk variables print as options in bash - bash

Question

I'm trying to make a script which reads your firefox profile.ini file, gives you options for which profile you want to unlock and execute a simple rm on the .lock file of the given profile (useful when you run multiple firefox sessions between workstations in different buildings and you did not logout correctly
I have the following file profile.ini for example
[General]
StartWithLastProfile=0
[Profile0]
Name=default
IsRelative=1
Path=rkfddmkn.default
Default=1
[Profile1]
Name=NX
IsRelative=1
Path=sf18055j.NX
[Profile14]
Name=gutter
IsRelative=1
Path=sf18055judsfsdfdfds.gutter
[Profile556]
Name=Jerusalem
IsRelative=1
Path=234920fgffdg38.Jerusalem
And this is the first part
ini=$HOME/.mozilla/firefox/profiles.ini
The script checks if profiles.ini exists otherwise exit
if [ -f $ini ]
then
The script reads the profiles.ini file and return multiple profiles as options followed by the name of the profiles
profiles=`cat $ini | grep "Profile[0-9*]"`
echo $profiles | awk -v RS=" " '{print}'
names=`cat $ini | grep Name | sed s/Name=/\/`
echo $names | awk -v RS=" " '{print}'
echo $options = $profiles . ' ' . $names; | awk -v RS=" " '{print}'
I'm not sure if I'm going down the right path.
How can I prompt the user to select an option by pairing the awk strings ?

Answer 1

A native-bash parser that breaks the relevant part of your input file into three associative arrays might look something like the following:
#!/usr/bin/env bash
set -x; PS4=':$LINENO+'
section_re='^\[Profile(.*)\][[:space:]]*$'
kv_re='^([[:alnum:]]+)=(.*)'
declare -A profilesByName=( )
declare -A profileNames=( )
declare -A profilePaths=( )
current_section=
while IFS= read -r line; do : line="$line"
[[ $line =~ $section_re ]] && { current_section=${BASH_REMATCH[1]}; continue; }
[[ $line =~ $kv_re ]] || continue
[[ $current_section ]] || continue ## ignore k/v pairs if not in a section
key=${BASH_REMATCH[1]}; value=${BASH_REMATCH[2]}
case $key in
Name) profileNames[$current_section]=$value
profilesByName[$value]=$current_section ;;
Path) profilePaths[$current_section]=$value ;;
esac
done
Then, if you want to delete the lockfile associated with a given profile name, it becomes as simple as:
deleteLockForName() {
local desiredName=$1
local selectedProfile selectedPath
selectedProfile=${profilesByName[$desiredName]}
[[ $selectedProfile ]] || { echo "ERROR: No profile with name $desiredName found" >&2; return 1; }
selectedPath=${profilePaths[$selectedProfile]}
echo "Deleting $selectedPath.lck" >&2
rm -f -- "$selectedPath.lck"
}
...as used in:
deleteLockForName Jerusalem
You can see it running at https://ideone.com/d0QFYa -- in the above example invocation, emitting Deleting 234920fgffdg38.Jerusalem.lck.

Answer 2

#CharlesDuffy is always a tough act to follow (try it...), but I took a somewhat different approach to solving your problem.
First, you don't need to deal with $HOME/.mozilla/firefox/profiles.ini at all. All you need to deal with is those profiles that have an existing lock symlink within their profile directory. So create an array just holding the names of the directories with with a lock symlink present to display to the user to remove. You can do that with find and sed in a simple command-substitution, e.g.
#!/bin/bash
moz="$HOME/.mozilla/firefox"
## locate all lockfile links that exist below "$moz"
readarray -t lockfiles < <(find "$moz" -type l -name lock -printf '%P\n')
Next, the select loop in bash will create a numbered menu with entries being the profile directories in your lockfiles array. The user can select the number corresponding to the profile directory name to remove (unlink) the lock symlink in that directory. For example:
## set prompt for select menu
PS3="Selection: "
## prompt
printf "\nThe following lockfiles found, select to remove, Quit to end:\n\n"
## create menu listing existing lockfile links
select lockname in "${lockfiles[#]%/*}" "Quit"; do
[ "$lockname" = "Quit" ] && break
if [ -h "$moz/$lockname/lock" ]; then
printf "\ndeleting lock %s\n" "$moz/$lockname/lock"
## uncomment to actually remove link
# unlink "$moz/$lockname/lock"
break
else
printf "\nerror: invalid selection.\n" >&2
fi
done
(note: setting PS3 controls the prompt displayed by the select loop, instead of the generic #?. Also note the /lock was trimmed from the contents of the array to display only the profile directory name in the select loop declaration with "${lockfiles[#]%/*}")
Putting it altogether, you would have:
#!/bin/bash
moz="$HOME/.mozilla/firefox"
## locate all lockfile links that exist below "$moz"
readarray -t lockfiles < <(find "$moz" -type l -name lock -printf '%P\n')
## set prompt for select menu
PS3="Selection: "
## prompt
printf "\nThe following lockfiles found, select to remove, Quit to end:\n\n"
## create menu listing existing lockfile links
select lockname in "${lockfiles[#]%/*}" "Quit"; do
[ "$lockname" = "Quit" ] && break
if [ -h "$moz/$lockname/lock" ]; then
printf "\ndeleting lock %s\n" "$moz/$lockname/lock"
## uncomment to actually remove link
# unlink "$moz/$lockname/lock"
break
else
printf "\nerror: invalid selection.\n" >&2
fi
done
Example Use/Output
$ bash ff_rm_lock.sh
The following lockfiles found, select to remove, Quit to end:
1) 3cblo6ag.dcr_new
2) Quit
Selection: 1
deleting lock /home/david/.mozilla/firefox/3cblo6ag.dcr_new/lock
or using "Quit" leaving all lock symlinks in place:
$ bash ff_rm_lock.sh
The following lockfiles found, select to remove, Quit to end:
1) 3cblo6ag.dcr_new
2) Quit
Selection: 2
(note: you must uncomment the line unlink "$moz/$lockname/lock" to actually remove the link -- I commented it to allow testing without removing my Firefox lockfile)
A different approach, but given your problem description, this should eliminate listing profiles with not associate lock symlink present. Let me know if you have questions.