shell wrapper lockfile

gistfile1.txt

#!/bin/bash
set -euo pipefail

lockfile="/tmp/myscript.lock"

if ( set -o noclobber; echo "$$" > "$lockfile") 2> /dev/null;
then
   trap 'rm -f "$lockfile"; exit $?' INT TERM EXIT

   ## COMMAND TO RUN GOES HERE
   # example:
   sleep 60
   
   rm -f "$lockfile"
   trap - INT TERM EXIT
else
   echo "Failed to acquire lockfile: $lockfile. Already running?"
   echo "Held by $(cat $lockfile)"
fi