Bash shell quandry 2

[gmorton]

Hi everyone

I've been trying all day to find out how to do the following and I'm having no luck. Any help would REALLY be appreciated.

I have a bash script that generates a log file, taking sar measurements at regular intervals in an endless loop. How can I assign a shortcut key that will call a function that I have written to do some cleen-up tasks before terminating. Control-c terminates my shell but, obviuosly, no clean-up is done. My function is quitter() and i've trieed the following, which doesn't work:

bind -x '"\C-q":quitter'

Thanks
Grant

 

[stevexff]

Seem to remember there is a way that you can trap a signal in a bash script. So you should be able to set it running in the background, and then send it a hangup (kill -hup). When it gets the hangup signal, it can close gracefully.

Sadly, I can't remember how to do it...

 

[thedaver]

You COULD have it check for the presence of a file as the trigger for it to stop running. This will come at some expense to the file system and may not be terribly desireable. Perhaps you could have it check once a minute? That way you could just "touch stopfile.txt" in some predetermined location - or you could delete the file and have the test condition be to stop if the file disappears.

You COULD also put a perl script wrapper around this with two system calls... I don't know the nature of your script, but you could have perl "system" the first script in the infinite loop and then if you ctrl-c that script then you SHOULD be able to return execution to perl, which could run another script for your cleanup.

A couple of ideas.

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[flugh]

I did a Google and found this page. Has a short example on trapping signals in bash shell scripts.

http://www.linuxien.com/docs/bash/shellscript.html

----
JBR

 

[jstreich]

You may want to try and look at unix scripting forum... If that doesn't do it you can always try writing a small program to handle it.

 

[gmorton]

Thanks flugh

It's working now

 

[thedaver]

Good digging flugh! Star from me too!

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