Option -p / --prefix prepends identifier to worker process names.

lib/delayed/command.rb

@@ -47,6 +47,9 @@ def initialize(args)
         opts.on('--sleep-delay N', "Amount of time to sleep when no jobs are found") do |n|
           @options[:sleep_delay] = n
         end
+        opts.on('-p', '--prefix NAME', "String to be prefixed to worker process names") do |prefix|
+          @options[:prefix] = prefix
+        end
       end
       @args = opts.parse!(args)
     end
@@ -76,6 +79,7 @@ def daemonize
 
     def run_process(process_name, dir)
       Daemons.run_proc(process_name, :dir => dir, :dir_mode => :normal, :monitor => @monitor, :ARGV => @args) do |*args|
+        $0 = File.join @options[:prefix], process_name if @options[:prefix]
         run process_name
       end
     end