Apple oxs manual Getting Online Help for Commands, Using Telnet, To enable Telnet access

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Using Telnet

Because it isn’t as secure as SSH, Telnet access isn’t enabled by default.

To enable Telnet access:

$ service telnet start

To disable Telnet access:

$ service telnet stop

Getting Online Help for Commands

Onscreen help is available for most commands and utilities.

Note: Not all techniques work for all commands, and some commands have no onscreen help.

To view onscreen information about a command, try the following:

•Type the command without any parameters or options. This will often list a summary of options and parameters you can use with the command.

Example:

$ sudo serveradmin

•Type man command, where command is the command you’re curious about. This usually displays detailed information about the command, its options, parameters, and proper use.

Example:

$ man serveradmin

For help using the man command, type:

$ man man

•Type the command followed by a -help, -h, --help, or help parameter. Examples:

$ hdiutil help

$ dig -h

$ diff --help

Chapter 1 Typing Commands