My simple timer to alert me when the chicken's ready to take out of the oven.

chicken.sh

#!/bin/bash

FILENAME=$(basename "$0")
PID=$(pgrep -o "$FILENAME")

if [ "$1" = "-k" ]; then
  MIN=$(ps -o start= -o cmd= -p "$PID" | cut -d' ' -f4)
  if [[ "$MIN" =~ ^-?[0-9]+$ ]]; then
    echo "Killing timer"
    kill -9 "$PID"
  else
    echo "No timer"
  fi
elif [[ "$1" =~ ^-?[0-9]+$ ]]; then
  echo "Chicken in $1 minutes"
  sleep "$1m" && boxcar.php "chicken" && notify-send --urgency=low -i face-cool "chicken" &
elif [ -n "$1"  ]; then
  echo "Usage: $0 [-k | MINUTES]"
else
  INFO=$(ps -o start= -o cmd= -p "$PID")
  START=$(echo "$INFO" | cut -d' ' -f1)
  MIN=$(echo "$INFO" | cut -d' ' -f4)
  NOW=$(date +%s)
  THEN=$(date +%s --date="$START")

  if [ -n "$MIN" ]; then
    LEFT=$(( (THEN + MIN*60 - NOW) / 60  + 1 ))
    if [[ $LEFT < 1 ]]; then LEFT='less than one'; fi
    echo "$LEFT minutes left"
  else  
    echo "No timer"
  fi
fi