Apple Xserve Up Mac OS X Server User's Guide download pdf (Page 30)

30 Chapter 4

Execute Commands

Once you are logged in using SSH, you can use command-line tools to execute commands

on the remote server.

If you want to execute a single command on the server and then immediately log out of the

server, you can do it in one step. Type your login information and the command, then press

Return. For example, the command to log in to a remote server and remove a ﬁle called “Test

Data” looks like this

ssh -l root 192.168.100.100 rm "/Documents/Test Data"

The server asks for the password, then executes the command and returns you to your

admin computer.

Close a SSH Session

When you are ﬁnished with a SSH session, you should close the session, especially if you are

logged in as the root administrator with root privileges, so that no one else can make

changes on the server. Here is an example of what a session might look like if jsmith logs in

to labserver2 as an administrator and then logs out.

[labserver1:~] jsmith%

ssh -l jsmith labserver2

Welcome to Darwin!

[labserver2:~] jsmith% exit

logout

Connection to labserver2 closed.

[labserver1:~] jsmith%

About Key Fingerprints

The ﬁrst time you connect to a server using SSH, your local computer adds a “ﬁngerprint”

from the remote server to a list of known remote host computers. The next time you

connect, you won’t see this message. Here’s what jsmith might see if he logged in to a server

for the ﬁrst time.

ssh -l jsmith 192.168.12.12

The authenticity of host '192.168.12.12' can’t be established.

RSA key fingerprint is

a8:0d:27:63:74:00:f1:04:bd:6a:e4:0d:a3:47:a8:f7.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.12.12' (RSA) to the list of known

hosts.

LL2133.book Page 30 Friday, May 24, 2002 11:17 AM

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Apple Xserve Up Mac OS X Server User's Guide Page 30