allow only single process to execute my script instead of having more than one process executing the same script

Hi Experts,

I wrote a bash script that will execute my php code every 30 min via cron job. For some reason when check the process via the ps aux | grep myphp.php, I can see more than one process that are running the same php code. Is there a way for me to ensure that there is only a single process that executes my code instead of having more than one process running the same code? Thanks
Kinderly WadeprogrammerAsked:
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jsaunCommented:
A very common way to do this is to write a PID file when the script starts.    Check to see if there’s an existing file, that tells you that either the script is running, or that a previous execution failed. Remove the file upon successful completion.
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Kinderly WadeprogrammerAuthor Commented:
Thanks jsaun!
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