I need to set up a script such that only one instance of it is running at a
time i.e. in case the script is already executing, it will not be started
again.

My problem is on a script taking a long time to execute (like it should) - I
find that for some reason the script stops somewhere in the middle and
starts to re-execute. I wish to catch this re-execute and halt the script
instead

N



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