Bash script to play a song when a process ends.

play_when_process_done.sh

#!/bin/bash

# Bash script to play a song when a process ends.
# License MIT <https://opensource.org/licenses/MIT>
# Author: @samirfor

PID=$1
SONGFILE=$2

if [ "${PID}x" = "x" ] || [ ! -r  "${SONGFILE}" ]; then
  echo "usage: $0 <pid> <songfile>" && exit 1
fi

ps --pid $PID &>/dev/null
[ $? -ne 0 ] && echo "PID does not exist." && exit 2

while sleep 1; do ps --pid $PID &>/dev/null; [ $? -eq 0 ] || break; done
mpg123 "$SONGFILE"