topic Re: User defined key for interrupting a infinite loop script ! in Operating System - HP-UX

User defined key for interrupting a infinite loop script !

Chris Fung — Thu, 08 Aug 2002 10:19:49 GMT

Hi all,

Any idea on implementing a user defined key e.g. "q" to interrupt a ever running while loop script ?

The reason for my question is that I want to write a script to continuosuly check some process until the user click on the "q" in the keyboard.

Appreciated it if you can give me some hints.

Cheers,

Chris

Re: User defined key for interrupting a infinite loop script !

harry d brown jr — Thu, 08 Aug 2002 10:22:07 GMT

What shell do you plan on using? Or will you be using perl?

live free or die
harry

Re: User defined key for interrupting a infinite loop script !

Bonny Jose_1 — Thu, 08 Aug 2002 10:27:37 GMT

Chris,

Why dont you use the unitl loop for this purpose?

-Bonny-

Re: User defined key for interrupting a infinite loop script !

Jean-Luc Oudart — Thu, 08 Aug 2002 10:59:41 GMT

Hope this help :
============================================
#!/bin/sh

trap 'echo bye && stty intr ^C && exit' 2
stty intr q
while [ true ]
do
date
sleep 1
done
============================================
I changed the interruption to the letter "q" and back to ^C when we quit the program.

Jean-Luc

Re: User defined key for interrupting a infinite loop script !

Chris Fung — Thu, 08 Aug 2002 14:45:57 GMT

Dear all,

I would like to use Bourn shell.

Regards,

Chris,

Re: User defined key for interrupting a infinite loop script !

Jean-Luc Oudart — Fri, 09 Aug 2002 07:39:59 GMT

POSIX shell is fine, the good "old" Bourne shell has to go.
I don't see the problem.
sh Bourne-shell command programming language and commands
interpreter residing in file /usr/old/bin/sh. Can
execute commands read from a terminal or a file. This
shell lacks many features contained in the POSIX and
Korn shells. The Bourne shell will be obsoleted.
Users are strongly encouraged to switch to the POSIX
shell. The Bourne shell will still be available as
/usr/old/bin/sh, for those users have to use it.

Jean-Luc