[Gllug] Getting PIDs

[Tethys]

>I was wondering if anyone knew of a nice way to get the PID
>of the parent of a process.

	getpid()

Oh, you mean from a shell script...

	ps -o ppid $pid

>Im writing startup scripts for a load of java apps that will spawn a
>load of children when run.
>
>What Im using at the moment is which is a bit of an ugly hack.
>
>pid=`ps auxwww |grep demo |grep -v initlog |grep -v bash | head -1 |awk
>'{print$2}'`

Rather than grepping the process table, it's far easier to just store
the PID of the process when it starts up:

	#!/bin/sh

	java -cp /foo/bar/demo StartJavaApp -Dinstance=1 &
	echo $! > /var/run/demo1.pid

	java -cp /foo/bar/demo StartJavaApp -Dinstance=2 &
	echo $! > /var/run/demo2.pid

If you really do need to grep, then use a regexp rather than multiple
grep statements:

	ps auxww | fgrep demo | egrep -v '(initlog|bash)'

Tet

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