chkint()
{
    let '${2} + 0' > ${DEV_NULL} 2>&1 &&
      return 0

    ROW_NBR="24"
    COL_NBR="1"

    eval addstr \"${CMD_MOVE}\" &&
      clrtoeol &&
      addstr "${1}: argument not a number" >&2 &&
      refresh &&
      ${ERROR_PAUSE} &&
      eval addstr \"${CMD_MOVE}\" &&
      clrtoeol &&
      refresh

    return 1
}