Apple Mac OS X Server (version 10.2.3 or later) Uživatelský manuál stáhnout pdf (Strana 591)

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Tools for Advanced Administrators 591

The percent symbol (%) is called the prompt. It indicates that you can enter a command.

Press the Return key after you type a command. Depending on what you typed, you could

see a list of information followed by another prompt, or your command will execute and give

you some type of feedback and a prompt, or you will receive no feedback and another

prompt. No feedback usually means that the command was executed properly.

Understanding UNIX Command-Line Structure

UNIX commands share some basic conventions. First you enter the name of the tool, then

any information the tool needs to carry out your request. Most tools come with help or man

(short for “manual”) pages that describe how to use the tool. Help pages give an overview of

arguments (also known as options or parameters) that the tool understands. Man pages give

more detail and examples:

m To ﬁnd help pages, type the name of the tool and then the argument “-help” (for example,

“dsimportexport -help”).

m To ﬁnd man pages for a tool, type “man”, followed by the tool name. For example, type

“man ssh” for information about the secure shell command.

When you supply information in a command, enclose location or item names that include

spaces in quotation marks (“like this”).

Secure Shell (SSH) Command

Secure Shell (SSH) lets you send secure, encrypted commands over a network. With SSH

turned on, you can use the Terminal application to open an SSH session and use command-

line tools to securely conﬁgure a remote server. You can also connect a terminal to a headless

server through the serial port and log in using SSH.

For complete information about SSH, type “man ssh” in Terminal.

Enabling and Disabling SSH Access

Access to Mac OS X computers using SSH is enabled by default.

You can disable SSH access to a Mac OS X computer locally or remotely:

m When logged in locally to a Mac OS X computer, make sure that “Remote login” in the

Sharing pane is not selected.

m To disable SSH access to a remote server, while in an SSH session with the remote

computer, type “systemsetup -setremotelogin off ”.

You can reenable SSH access only locally.

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