Monitor some random process by current user and process name and notify when it is complete

mon

#!/usr/bin/env ruby

# Usage:
#
#   ./mon git 0.3 # => will monitor "git" every 0.3 seconds until it dies

start = Time.now
user = `whoami`.strip
name = ARGV[0]
frequency = (ARGV[1] || 1).to_f # Default to 1 second if second argument not given

def elapsed_time start
  finish = Time.now
  diff = finish - start

  seconds = diff.to_i
  minutes = (seconds / 60).to_i
  hours = (minutes / 60).to_i

  ["%02d" % hours, "%02d" % (minutes % 60), "%02d" % (seconds % 60)]
end

if name

  puts "\nMonitoring via `ps -U #{user} | grep #{name}`\n"
  puts "Type ctrl+c to exit early.\n\n"

  loop do

    ps = `ps -U #{user} | grep #{name}`

    elapsed = elapsed_time start
    print "#{name} running...  Time elapsed: #{elapsed[0]}:#{elapsed[1]}:#{elapsed[2]}\r"
    $stdout.flush

    if ps.empty?
      puts "\nFinished at #{Time.now}."
      `notify-send "#{name} is done!"`
      break
    end

    sleep frequency

  end

else

  puts 'You need to supply a program-name to monitor, e.g `./mon git`'

end