script help

[Petra Sandberg]

Hi, I've created a script that put PID's in a variable,
(PC='ps -fu petra | grep process | cut -c 14-20') now I want to match this output whit the PPID of the process, so that if the PPID is a specific number then do something.

Any suggestions on how to...

Rgds
Petra

[Stefan Farrelly · Accepted solution]

Once you have your pid in $PC then;

ps -fp $PC | awk '{print $3}' | grep -v PPID

returns the PPID of pid $PC
or you enclose the whole thing above into another variable;
PPID=$(ps -fp $PC | awk .....)

[Robert Thorneycroft]

You should use awk to pull out the value you want as cut can give wrong values in the way you are using it.

ie on my system
ps -fu root | grep opcmona | cut -c 14-20
Give output of.
2 10702

Where the value of 2 is actually the last digit of the PID and the other numbers are the PPID you are after.

You should use:

PID=`ps -fu petra | grep process | awk '{ print $2 }'`
PPID=`ps -fu petra | grep process | awk '{ print $3 }'`

For an individual process this shoould work perfectly to give you both values you require.

Kind regards,

Robert Thorneycroft