How to check if another instance of my shell script is running

Question

GNU bash, version 1.14.7(1)

I have a script is called \"abc.sh\" I have to check this from abc.sh script only... inside it I have written f

Answer 1

I create a temporary file during execution.

This is how I do it:

#!/bin/sh
# check if lock file exists
if [ -e /tmp/script.lock ]; then
  echo "script is already running"
else
# create a lock file
  touch /tmp/script.lock
  echo "run script..."
#remove lock file
 rm /tmp/script.lock
fi

Answer 2

[ "$(pidof -x $(basename $0))" != $$ ] && exit

https://github.com/x-zhao/exit-if-bash-script-already-running/blob/master/script.sh

Answer 3

pidof wasn't working for me so I searched some more and came across pgrep

for pid in $(pgrep -f my_script.sh); do
    if [ $pid != $$ ]; then
        echo "[$(date)] : my_script.sh : Process is already running with PID $pid"
        exit 1
    else
      echo "Running with PID $pid"
    fi  
done

Taken in part from answers above and https://askubuntu.com/a/803106/802276