Run commands arbitrary number of times. (Use-cases : test out flakey failures, test out external system performance etc)

looped_command_runner.sh

#!/bin/bash
# eg : ./spec_runner.sh -n 2 -c "ls -l"
# -n => number of times
# -c => command to be run

repeats=5
command_to_run="echo Hello World"

line_break() {
  echo "-------------------------------------------------------------------"
}

loop_run_command() {
  echo "Running command \"$command_to_run\" for $repeats times"
  line_break

  for (( i = 1; i <= $repeats ; i++ ))
  do
    line_break
    echo "Current Run : $i"
    line_break
    eval "$command_to_run"
  done;
}

while getopts n:c: OPT
do
  case "$OPT" in
    n)
      repeats=$OPTARG
      ;;
    c)
      command_to_run=$OPTARG
      ;;
    \?)
      echo 'No arguments supplied. Running default command.'
      ;;
  esac
done

loop_run_command

line_break
echo "Done.✅"