pomodoro-like shell script for time management (beeps and does a cowsay to indicate when it's finished)

kieltime.sh

#!/bin/bash

#check if numeric
is_numeric() {
  if [ "$1" -eq "$1" ] 2> /dev/null; then
    return 0
  else
    echo "Error, time input \"$1\" not int, see -h for help" | cowsay -f tux
    exit 1
  fi
}

#option handling
hours=0
minutes=0
seconds=0
verbose_flag=0
message=""
message_flag=0

while getopts :h:m:s:vr: opt; do
  case $opt in
    h)
      if is_numeric $OPTARG; then
        hours=$OPTARG
      fi
      ;;
    m)
      if is_numeric $OPTARG; then
        minutes=$OPTARG
      fi
      ;;
    s)
      if is_numeric $OPTARG; then
        seconds=$OPTARG
      fi
      ;;
    v)
      verbose_flag=1
      ;;
    r)
      message_flag=1
      message="$OPTARG"
      ;;
    *) echo "Usage: -h -m -s for hours/min/sec, -v for verbose, -r for reminder, or no parameters for minutes\n"
      exit 1
      ;;
  esac
done

shift $((OPTIND-1))  #allows you to use other parameters afterwards as normal

#check if $1 is numeric, if so add to minutes
if [ "$1" -eq "$1" ] 2> /dev/null ; then
  minutes=$(($minutes + $1))
elif [ "$1" != "" ]; then
  echo "Error, time input \"$1\" not int, see -h for help" | cowsay -f tux
  exit 1
fi

if [ $verbose_flag -eq 1 ]; then
      echo -e "\n\ntask set to $hours hours, $minutes minutes, and $seconds seconds\n\n"
fi

sleep $(($seconds + $minutes*60 + $hours*3600))

if [ $message_flag -eq 0 ]; then
  echo "all done" | figlet | cowsay -n
else
  echo "$message" | figlet | cowsay -n
fi

echo -e "\a"

exit 0