~ Name:
~ ~~~~~
~ pid -- Show a running application's process ID
~ 
~ Synopsis:
~ ~~~~~~~~~
~ play pid [app_path]
~
~ Description:
~ ~~~~~~~~~~~~
~ Display the app_path.logs/server.pid file's contents.
~ If app_path is omitted, the current directory is used.
~
~ The server.pid file contains the pid of the running Java process when the application is run
~ in background mode using the 'start' command.
~