A script to unload its associated job from launchd.

com.myservice.name-unload.rb

#!/usr/bin/env ruby

module LaunchdPlist
  class << self
    def find
      plist = LaunchdPlist.new
      plist.find
    end
  end

  class LaunchdPlist
    require 'pathname'

    def boot_launchdaemons
      Pathname.new("/Library/LaunchDaemons")
    end

    def user_launchdaemons
      Pathname.new("~/Library/LaunchAgents").expand_path
    end

    def real_user
      require 'etc'
      Etc.getpwuid(Process.uid).name
    end

    def superuser?
      real_user == "root"
    end

    def find
      ld = nil
      if superuser?
        ld = boot_launchdaemons
        (boot_launchdaemons+"label.plist").exist?
      else
        ld = user_launchdaemons
        (user_launchdaemons+"label.plist").exist?
      end
      @plist = (ld+"#{@label}.plist")
      self
    end

    def exist?
      @plist.exist?
    end

    def to_s
      @plist.to_s
    end

    def unload
      if @plist.exist?
        `launchctl unload #{@plist}`
      else
        raise "Couldnt find plist file '#{@plist}' to unload job label '#{@label}'"
      end
    end

    def initialize *args, &blk
      @label = ENV["LAUNCHD_JOB_LABEL"] || ARGV[0] || Pathname.new($0).basename(".rb").to_s
      if @label.nil? || @label.empty?
        raise "No launchd job label found. Please supply an environment variable $LAUNCHD_JOB_LABEL, or argv commandline argument"
      end
    end
  end
end

plist = LaunchdPlist.find
# $stdin.close
# plist.unload
`launchctl unload #{plist}`