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My variant on this common function. Some highlights:
Allows you to override the default ps args of "aux"
Uses bracket trick to omit the grep process itself without having to use a second grep
Always prints the correct header row of ps output
Limitations: Ugly ps error output if you forget to quote your multi word grep argument
There is 1 alternative - vote for the best!
If you can do better, submit your command here.
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Some systems have similar utilities such as pgrep.
And then... some don't. Is that any reason to downvote a script that is useful to people not blessed with pgrep?