Capturing a ^C to break out of a script?

[m.w.chang]

from some old messages in caldera linux-uses. maybe we can add to the 
linux-sxs website.

**** by Eric Ratcliffe, Jan 1999

You'll probably have to put in a few stty lines in the script to disable
breaking.  I've never done this, but I will bet that it works.

In the beginning of the script, have something like

stty -ignbrk

and at the end, have something like

stty -cbreak

Note that this method will defintely require some research; I have not done
it myself, so I guarantee there's something I'm missing.  You did ask for
pointers, though. :)

**** by John Pinner, Jan 1999

You can do this with the shell built-in command trap.

Syntax is 'trap [command_string] signal'

where signal is the number (as defined in /usr/include/asm/signal.h) of
the signal to be trapped.

command_string is the command string to be executed when the trap is
taken, if null the trap will not be taken.

if command_string is omitted the trap will be restored to the default

so....

trap "echo Goodbye" 0

will echo Goodbye when you logout (signal 0)

trap "" 2 3 will disable signals 2 and 3 ( interrupt and quit )  # This
what you want ?

trap 2 3 will restore the signals to the default action


Hope this helps,


James McDonald wrote:
> Umm I was wondering if there is anyway of breaking out of a script by 
> capturing the CTRL+C combination and completey exiting the script I am 
> running the following and if the login fails it still trys to go through the 
> entire 'for in do'
> 
> Thanks
> 
> #!/bin/sh
> # login to cvs
> 
> me=$0
> 
> export CVSROOT=:pserver:guest at cvs.openoffice.org:/cvs
> 
> 
> cvs login
> 
> for  i in `echo *`
> 
> do
>         echo Checking Out $i
>         cvs -z3 co -PA $i
> done
> 
> cvs logout
> 
> echo "$0 Done"
> 


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