topic Re: Using "Ctrl-C" in Scripting in Operating System - HP-UX

Using "Ctrl-C" in Scripting

Ryan Bernard — Thu, 27 Nov 2008 07:27:56 GMT

Hi anybody know how we can use "Ctrl-C" in a script?,

It required in the script to break out from certain processes.

Thanks alot for your help~

Re: Using "Ctrl-C" in Scripting

Wim Rombauts — Thu, 27 Nov 2008 07:40:10 GMT

In vi, while in insert mode, first pres Ctrl-V and then Ctrl-C. That will insert the Ctrl-C in your script.

Re: Using "Ctrl-C" in Scripting

Dennis Handly — Thu, 27 Nov 2008 07:41:00 GMT

If you type Control-C, your script should be aborted. If you want to trap it, you can use "trap command INTR".

If you want to send a control-C to another process you can use:
kill -INTR PID

Re: Using "Ctrl-C" in Scripting

Sagar Sirdesai — Thu, 27 Nov 2008 07:46:30 GMT

Hi
Please use the trap command in your script

trap "exit" 2

This exit the script whenever it receives a
Ctlr C

Sagar

Re: Using "Ctrl-C" in Scripting

Dennis Handly — Thu, 27 Nov 2008 08:07:29 GMT

You may have to use INT where I had INTR.

Re: Using "Ctrl-C" in Scripting

Laurent Menase — Thu, 27 Nov 2008 10:14:52 GMT

or Do you want on ctrlC kill some of children processes?

myproc1 &
firstpid=$!
myproc2 &
secondpid=$!
myproc3 &
thirdpid=$!

trap "kill -SIGINT $secondpid" 2

Then if you CtrlC it will kill only myproc2

Re: Using "Ctrl-C" in Scripting

James R. Ferguson — Thu, 27 Nov 2008 15:18:22 GMT

Hi Ryan:

You can change what the trap does, too. You might want to disable the Ctrl_C interrupt (INT) in a critical region of your script's code and then change it to "normal" behavior. For example:

# cat ./myctrl_c
#!/usr/bin/sh
function paint
{
typeset -i n
while (( n < 9 ))
do
echo $1
(( n=n+1 ))
sleep 1
done
}
trap 'echo That was not allowed!' INT
paint "+"
echo "...try interrupting now"
trap 'echo CTRL_C sensed;exit' INT
paint "-"
exit 0

See the 'sh-posix' manpages for more information, too.

Regards!

...JRF...

Re: Using "Ctrl-C" in Scripting

Ryan Bernard — Tue, 02 Dec 2008 07:12:37 GMT

Thanks alot for your recommendations. Currently trying out the recommendations.

1 more thing, how do we actually do a 60sec wait state?

Re: Using "Ctrl-C" in Scripting

Sagar Sirdesai — Tue, 02 Dec 2008 07:25:00 GMT

Hi'Use the sleep command

sleep 60

This will wait for 60 seconds

Sagar

Re: Using "Ctrl-C" in Scripting

Sagar Sirdesai — Thu, 04 Dec 2008 05:49:59 GMT

Hi Ryan

Please assign points if you have got the answers you needed

Sagar

Re: Using "Ctrl-C" in Scripting

Ryan Bernard — Thu, 04 Dec 2008 16:15:44 GMT

Hi Sagar

Sorry in the delay in assigning points as I am trying to check if the provided solutions help. Thanks alot for your help.

Wonder if somebody can help as I am stuck. I trying to do a tusc command for 60 secs before it cntrl-C, but not too sure how to do it. Initially I try the below steps but think it never go to sleep as the tusc command is still running, hence it never cntrl C

tusc
sleep (60)
ctrl-C

Re: Using "Ctrl-C" in Scripting

Laurent Menase — Thu, 04 Dec 2008 16:34:19 GMT

You should use kill and tusc in background

tusc myprog &
thepid=$!
sleep 60
kill -2 $thepid

If you want attach to the process
tusc -o filresult pid &
thepid=$!
sleep 60
kill -2 $thepid

Re: Using "Ctrl-C" in Scripting

James R. Ferguson — Thu, 04 Dec 2008 16:37:22 GMT

Hi (again) Ryan:

All answers are eligible for points (0-10). Please read:

http://forums11.itrc.hp.com/service/forums/helptips.do?#34

Regards!

...JRF...

Re: Using "Ctrl-C" in Scripting

Ryan Bernard — Mon, 12 Jan 2009 04:02:51 GMT

I try the below and it works~! thanks~!

tusc command
sleep 5
kill -QUIT %1