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Thanks, Ripat, nice examples, so the code can be eased like this

# Create the lock file
lockfile -r0 ${0}.lock && {
# Your code goes here!
}
# Release the lock file manually
rm -f...

(Hi, Mod, thanks for your note, I'd pay attention next time)

Yes, you can decrease the file size by recreating it.

Sometimes we need a single instance of a script to run at a time. Meaning, the script itself should detects whether any instances of himself are still running and act accordingly.

When multiple...