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  • Possible duplicate of what is $$ in bash? Commented Oct 22, 2018 at 14:28
  • consult the duplicate, it's basicaly $$ Commented Oct 22, 2018 at 14:28
  • Do you want the PID ? or do you want the command running ? Commented Oct 22, 2018 at 14:30
  • 2
    What if someone else ran a "./hello.sh", or if you ran a second one? Commented Oct 22, 2018 at 14:32