cwatch

#!/bin/bash
# (c) 2020 Leif Sawyer
# License: GPL 3.0 (see https://github.com/akhepcat/)
# Permanent home:  https://github.com/akhepcat/Miscellaneous/
# Direct download: https://raw.githubusercontent.com/akhepcat/Miscellaneous/master/cwatch
# 
PROG="${0##*/}"
WIDTH=$(tput cols)

trap cleanup SIGINT SIGTERM SIGKILL SIGQUIT SIGABRT SIGSTOP SIGSEGV

cleanup() {
#	printf "\033[2J"
	printf "\033[?25h"
        echo -e "\n"
        exit 0
}

usage() {
        echo "Usage:"
        echo "${PROG} [-h] [-n N] [commandline]"
        echo "        -n N - change the sleep time from the default of 2 to user supplied N"
        echo "        -h   - this usage text"

        exit 1
}

while getopts ':hn:' opt; do
  case $opt in
    n) SLEEP="${OPTARG//[^0-9]/}"
       shift 2
      ;;
    h) usage;
      ;;
    *) echo "Invalid option: -$OPTARG";
      usage;
      ;;
  esac
done

[[ -z "$*" ]] && usage

printf "\033[2J\033[?25l"

while true ; do
  printf "\033[0;0H[%s] Output of %s:\n" "$(date)" "$*"
  ${SHELL-/bin/bash} -c "$*"
#  printf "\033[0;${WIDTH}f"

  sleep ${SLEEP:-2}	# genuine Quartz movement
done