How to add conditional check of whether a process is running before doing rest of script?

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Top Forums Shell Programming and Scripting How to add conditional check of whether a process is running before doing rest of script?
# 15  
Old 09-23-2013
Originally Posted by nbsparks
Hi everyone,

So the thread so far has left me confused. So I kept digging. If found some code and modified it to this:
if ps -u mcmaps | grep ''
     echo Running
     echo Not Running

So far, this works. The "" is only run from the mcmaps user. And when it is currently running, the script above reports "Running." When it's not running, it accurately states, "Not Running" (so far).

So, would this work? What are the dangers of this?
The dangers of not using a proper PID file are those of accidentally creating more than one instance by running one check shortly after another.
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