help
This command displays a list of currently available commands and details of what they do.
        help  | 
| 
         Displays a list of available commands and a brief description of what each command does.  | 
        help <command>  | 
| Displays detailed information about the specified command. | 
        help <command> <subcommand>  | 
| Displays detailed information about the specified command and subcommand. |