Run a command periodically

periodically.sh

#!/bin/bash

# Set the default period to 1 second
period=1

# Parse the command line arguments
while getopts ":p:" opt; do
  case ${opt} in
    p )
      period=$OPTARG
      ;;
    \? )
      echo "Invalid option: $OPTARG" 1>&2
      exit 1
      ;;
    : )
      echo "Invalid option: $OPTARG requires an argument" 1>&2
      exit 1
      ;;
  esac
done
shift $((OPTIND -1))

# Execute the command periodically
while true; do
  date
  "$@"
  echo -e ""
  sleep "$period"
done