How do I check for the existence of a process without a failed exit code being returned?

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                          I’m using Amazon Linux.  I want to start a process provided one isn’t running already.  This is a bash script I embed within a Jenkins Maven job.  So I have

	pids=$(pidof /usr/bin/Xvfb)
	if [ ! -n "$pids" ]; then
	    Xvfb :0 -screen 5 1024x768x8 &
	fi

Unfortunately, if there is no process, the line “pids=$(pidof /usr/bin/Xvfb)” returns a failing exit code and none of the other lines following are executed.  Is there a way I can write the above such that no failed exit codes will be returned?
                        

Asked by Dave (2808 rep)

Apr 28, 2016, 01:47 AM
Last activity: May 24, 2020, 06:41 AM

How do I check for the existence of a process without a failed exit code being returned?

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