^C in Shell Script

BigglesZX · 08-29-2006, 04:12 PM

Hi everyone,

Just a quick question really - I've written a shell script that lets the user pick from a list of interactive programs to launch, and in some if ^C is keyed, control will return to my script, in others the script exits. Is there any way to ensure that any keying of ^C will affect only the called program and not my script?

Many thanks,

Biggs

macemoneta · 08-29-2006, 04:29 PM

You'll need to trap the ctrl-c (and any other signal that you want to control) in your script. For example:

Code:

#!/bin/bash

function CLEANUP () {
   echo
   echo "ignoring signal"
   echo
   return
}

trap CLEANUP INT
trap CLEANUP HUP
trap CLEANUP QUIT
trap CLEANUP USR1
trap CLEANUP TERM

while true
do
   echo -n "what? "
   read x
   if [ "$x" == "q" ]
   then
      exit
   else
      echo "I got $x"
   fi
done

BigglesZX · 08-29-2006, 04:41 PM

That's great, thank you so much

. Am I right in thinking that ^C is SIGINT?

macemoneta · 08-29-2006, 04:56 PM

Yes - easy to prove... just comment out the other 'trap' statements and verify.

BigglesZX · 08-29-2006, 05:01 PM

Nice one

. Thanks again!