Attempt to replicate 'watch' command, never used, so expelled from my .bashrc

watch

# Check if 'watch' is available, if not, enable a stop-gap function
if ! command -v watch &>/dev/null; then
  watch() {
    local OPTIND colWidth titleHead sleepTime dateNow

    while getopts ":hn:vt" optFlags; do
      case "${optFlags}" in
        (h)  printf '%s\n' "Usage:" " watch [-hntv] <command>" "" \
              "Options:" \
              "  -h, help.      Print a summary of the options" \
              "  -n, interval.  Seconds to wait between updates" \
              "  -v, version.   Print the version number" \
              "  -t, no title.  Turns off showing the header"
            return 0;;
        (n)  sleepTime="${OPTARG}";;
        (v)  printf '%s\n' "watch.  This is a bashrc function knockoff that steps in if the real watch is not found."
             return 0;;
        (t)  titleHead=false;;
        (\?)  printf '%s\n' "ERROR: This version of watch does not support '-$OPTARG'.  Try -h for usage or -v for version info." >&2
              return 1;;
        (:)  printf '%s\n' "ERROR: Option '-$OPTARG' requires an argument, e.g. '-$OPTARG 5'." >&2
             return 1;;
      esac
    done
    shift $(( OPTIND -1 ))

    # Set the default values for Title and Command
    sleepTime="${sleepTime:-2}"
    titleHead="${titleHead:-true}"

    if [[ -z "$*" ]]; then
      printf '%s\n' "ERROR: watch needs a command to watch.  Please try 'watch -h' for usage information."
      return 1
    fi

    while true; do
      clear
      if [[ "${titleHead}" = "true" ]]; then
        dateNow=$(date)
        (( colWidth = $(tput cols) - ${#dateNow} ))
        printf "%s%${colWidth}s" "Every ${sleepTime}s: $*" "${dateNow}"
        tput sgr0
        printf '%s\n' "" ""
      fi
      eval "$*"
      sleep "${sleepTime}"
    done
  }
fi