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#!/bin/bash

usage() {
  echo "usage:  `basename $0` [-n secs] command"
}

if [ $# -eq 0 ]
then
  usage
  exit 1
fi

seconds=2

while getopts "n:" opt
do
  case $opt in
    n)
      seconds=$OPTARG
      shift $(($OPTIND - 1))
      ;;
    *)
      usage
      exit 1
      ;;
  esac
done

command=$1

while [ 1 ]
do
  res=$(eval $command)
  time=$(date "+%a %b %e %T %Y")
  cols=$(tput cols)
  part=$(printf "Every %ss: %s " "$seconds" "$command")
  just=$(($cols - ${#part}))
  clear
  printf "%s%*s\n\n%s\n" "$part" $just "$time" "$res"
  sleep $seconds
done