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Full Discussion: How to track and later kill a process in a script
Top Forums Shell Programming and Scripting How to track and later kill a process in a script Post 302398925 by Narnie on Friday 26th of February 2010 12:42:43 AM
Old 02-26-2010
How to track and later kill a process in a script
Hello,

I am trying to write a script that turns off the screensaver for a certain period of time, then come back on. I have had it up and running for a while, but then I decided to refactor it a bit for my family members that are less computer savvy.

I am starting a subshell for the "meat" of the off script

Code:
(sleep $STIME ; sson ;exit) &

I want to be able to find this sleep command and kill the command. This allows the finishing of the script calling my sson script and then exiting.

I could always do a "ps ux|grep sleep|awk '{print $2}'|xargs kill", but if I happen to any other script with a sleep running that is not associated with sleeping the screesaver, this will kill that one too.

I was hoping to use the $! ability of bash on the subshell and kill that, but is many of you probably already knew, killing the bash doesn't kill the sleep. As I'm typing this, I thought of this:

Code:
(
sleep $STIME &
PID=$!
if [ ! -f /tmp/sleep.pid ] ; then
    touch /tmp/sleep.pid
else
    echo $PID >> /tmp/sleep.pid
fi
wait $PID
sson
exit
) &

I do the whole touch and append thing because I would like to keep a log of the pids and kill any that might have been run (or kill all previous before) in case my ssoff script is invoked twice.

Plus, I just want to do an exercise for my own learning on PID tracking.

Is this the way it should be done, or is there a better way of coding it?

With thanks,
Narnie
 

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LEARN ABOUT OPENSOLARIS

xdg-screensaver

XDG-SCREENSAVER(1)														XDG-SCREENSAVER(1)

NAME

       xdg-screensaver - command line tool for controlling the screensaver

SYNOPSIS

       xdg-screensaver suspend WindowID

       xdg-screensaver resume WindowID

       xdg-screensaver {activate lock reset status}

       xdg-screensaver {--help --manual --version}

DESCRIPTION

       xdg-screensaver provides commands to control the screensaver.

       xdg-screensaver is for use inside a desktop session only. It is not recommended to use xdg-screensaver as root.

COMMANDS

       suspend WindowID
	      Suspends the screensaver and monitor power management.  WindowID must be the X Window ID of an existing window of the calling
	      application. The window must remain in existance for the duration of the suspension.

	      WindowID can be represented as either a decimal number or as a hexadecimal number consisting of the prefix 0x followed by one or
	      more hexadecimal digits.

	      The screensaver can be suspended in relation to multiple windows at the same time. In that case screensaver operation is only
	      restored once the screensaver has been resumed in relation to each of the windows

       resume WindowID
	      Resume the screensaver and monitor power management after being suspended.  WindowID must be the same X Window ID that was passed to
	      a previous call of xdg-screensaver suspend

       activate
	      Turns the screensaver on immediately. This may result in the screen getting locked, depending on existing system policies.

       lock   Lock the screen immediately.

       reset  Turns the screensaver off immediately. If the screen was locked the user may be asked to authenticate first.

       status Prints enabled to stdout if the screensaver is enabled to turn on after a period of inactivity and prints disabled if the
	      screensaver is not enabled.

OPTIONS

       --help Show command synopsis.

       --manual
	      Show this manualpage.

       --version
	      Show the xdg-utils version information.

EXIT CODES

       An exit code of 0 indicates success while a non-zero exit code indicates failure. The following failure codes can be returned:

       1      Error in command line syntax.

       3      A required tool could not be found.

       4      The action failed.

EXAMPLES

       xdg-screensaver suspend 0x1c00007

       Causes the screensaver to be disabled till xdg-screensaver resume 0x1c00007 is called.  0x1c00007 must be the X Window ID of an existing
       window.

AUTHOR

       Bryce Harrington.
       <bryce@osdl.org>

xdg-utils 1.0							    06/24/2007							XDG-SCREENSAVER(1)
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