Unix pidof for OSX

pidof

#!/usr/bin/env ruby
# pidof for OSX. Basically a small modification of doitian's gist
target = ARGV[0] || ""
ids = []
`/bin/ps -ax -o pid,comm`.split("\n").each do |line|
    pid, command = line.chomp.split(' ', 2)
    short_command = File.basename(command)
    if target == command or target == short_command or
      target =~ /^[-]?#{short_command}/
        ids << pid
    end
end

exit 1 if ids.empty?
puts ids.join(' ')
exit 0