Cancel an existing print job
cancel command is used to cancel an existing print task.
cancel(option)(parameter)
-a: Cancel all print tasks;
-E: Force encryption when connecting to the server;
-U: Specify the user name used when connecting to the server;
-u: Specifies the user to whom the print task belongs;
-h: Specify the server name and port number to connect to.
Print job number: Specify the print job number to be canceled.