Simple bash state machine to re-run script in the same place after failure. Better to use case statement fall through if you have Bash 4.

Bash State Machine

#!/bin/bash

LOL=/tmp/LOLZ
RUNNING=true

while $RUNNING; do
  case $([ -f $LOL ] && cat $LOL) in
   INIT)
      echo "Reached INIT State. Moving to WORK state."
      echo "WORK" > $LOL
      ;;
    WORK)
      echo "Reached WORK State."
      if [ ! -f /tmp/PASS ]; then
        echo "Simulating failure. Touch /tmp/PASS to fix."
        exit 1
      fi
      echo "BREAK" > $LOL
      ;;
    BREAK)
      echo "Reaching BREAK State. Getting out of loop."
      RUNNING=false
      ;;
    *)
      echo "file doesn't exist, creating init state"
      echo "INIT" > $LOL
      ;;
  esac
done

echo "Script finished successfully."
exit 0

this was helpful for me thank you

It also helped me a lot, even though it didn't work on current version of bash. Feel free to check out my implementation of bash stack/state machine.