I've seen a few of these questions, and a few answers, but they only tells me how to echo the results to the screen, and often only refers to one character. I need to remove the chars ', and keep the answer inside a variable

My $var3 is: '/scripts/test1.sh', 'Alf Complete', '-', 'S1E1', '-', 'Episode 1', 'has', 'been', 'paused', 'hellfire', 'i', 'Engsub - Series', 'testing'] (It's an output from another program)

This is suppose to be converted to a command, and started by using "$var4" (and should look something like this) /scripts/test1.sh Alf Complete - S1S1 - Episode 1...

So the question is, how can I remove the chars I don't want and keep the new data in a new variable (for example $var4)

I might add that I'm very new at both Linux and writing script.. so please, treat me as "stupid"..

Edit 27/1

I'm starting the script with:

./test1.sh 'test1','test2','test3'

The text behind the script is arguments left by the program that calls the script.

This is my current script

# populate var0
read -r var0<<-EOF
messer  # is the program that is going to be called in the end of this script

# populate var1
read -r var1<<-EOF
 --command='m "Adam Larsson"   # this is the first arguments 
# populate argumentsreal
read -r argumentsreal<<-EOF
$@   #this is the arguments that are posted by the application that calls this script

var4="'"  # this adds the last closing '  to the code

# Join Forces
var3="$var0 $var1 $argumentsreal $var4"   
echo $var3>txt.txt # dumping result (bugcheck)
$var3  # Executing command

This is my code so far, my biggest issue is that when I'm running it, the program messer says Invalid message - check your syntax But if I do cat txt.txt I will get the result:

messer --command='m "Adam Larsson" testing test1,test2,test3

If I now copy that text line, and paste it on the command line, and press enter, it works perfectly.

So, why isn't it working when I'm running it from the script?

  • Where does the contents of that variable come from? If it's a command and a filename, it would be better to keep them in an array. See e.g. How can we run a command stored in a variable?
    – Kusalananda
    Jan 22, 2020 at 21:12
  • The output is from Plex media server, I'm trying to get it to send a message via messenger instead of constantly sending email..
    – JoBe
    Jan 22, 2020 at 21:37
  • That link is like Russian to me.. If got the program to start, so that's not the issue, it's all the ',' that are breaking the program..
    – JoBe
    Jan 22, 2020 at 21:38
  • 1
    How will your script tell "Episode 1" from "Episode" "1", then?
    – RudiC
    Jan 23, 2020 at 9:08
  • @RudiC (didn't see your comment until now) I have no idea, but this script is only meant to send the information further but without all the '',' chars..
    – JoBe
    Jan 27, 2020 at 5:52

2 Answers 2


try with tr -d \',; like printf '%s\n' "$var3" |tr -d \',; this removes all commas and single quotes from the $var variable.


Try bash's "Parameter Expansion: Pattern substitution" :

$ echo "${var3//,}"
'/scripts/tautullimess.sh' 'Alf Complete' '-' 'S1E1' '-' 'Episode 1' 'has' 'been' 'paused' 'hellfire' 'i' 'Engsub - Series''testing']
$ echo "${var3//[\',]}"
/scripts/tautullimess.sh Alf Complete - S1E1 - Episode 1 has been paused hellfire i Engsub - Series testing]
  • Anyway to echo the result so it will be executed as a command? Or echo it to another variable?
    – JoBe
    Jan 27, 2020 at 7:51
  • Try $ ${var3//[\',]}
    – RudiC
    Jan 27, 2020 at 7:55
  • Yeah, oh, does that executes it as a command, I thought it only displayed the result (newbie as I wrote)
    – JoBe
    Jan 27, 2020 at 7:57
  • The result was: ./test1.sh: 22: ./test1.sh: Bad substitution and I exexuted: ./test1.sh 'kalle','damke','hekl' one interesting thing is that when I just echoed $var3 without your modification it seemed to strip the ' signs by it self: messer --command='m "Adam Larsson" testing kalle,damke,hekl '
    – JoBe
    Jan 27, 2020 at 8:09
  • More context necessary. For me, it works (prints param count, and parameters): ${var3//[\',]} - CNT: 16, P1: Alf, P2: Complete, ALL: Alf Complete - S1E1 - Episode 1 has been paused hellfire i Engsub - Series testing]
    – RudiC
    Jan 27, 2020 at 8:28

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