BASH FILE LOCKING

Simple example bash file locking 

#!/bin/bash
if [ -f "$HOME/testlocking.lock" ] ; then
  echo "Maaf, aplikasi sudah jalan!! Ignore..."
  exit 1
fi

touch "$HOME/testlocking.lock"
echo "Aplikasi jalan....lamaaaaaaa"
sleep 6
rm "$HOME/testlocking.lock"

:)