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44.2 The ssh Program
Using the ssh program, it is possible to log in to remote systems and work interactively.
It replaces both telnet and rlogin. The slogin program is just a symbolic link pointing
to ssh. For example, log in to the host sun with the command ssh sun. The host then
prompts for the password on sun.
After successful authentication, you can work on the remote command line or use inter-
active applications, such as YaST. If the local username is different from the remote
username, you can log in using a different login name with ssh -l augustine
sun or ssh augustine@sun.
Furthermore, ssh offers the possibility to run commands on remote systems, as known
from rsh. In the following example, run the command uptime on the host sun and
create a directory with the name tmp. The program output is displayed on the local
terminal of the host earth.
ssh otherplanet "uptime; mkdir tmp"
Password:
1:21pm
up
2:17,
9 users,
load average: 0.15, 0.04, 0.02
Quotation marks are necessary here to send both instructions with one command. It is
only by doing this that the second command is executed on sun.
44.3 scp—Secure Copy
scp copies files to a remote machine. It is a secure and encrypted substitute for rcp. For
example, scp MyLetter.tex sun: copies the file MyLetter.tex from the host
earth to the host sun. If the username on earth is different than the username on sun,
specify the latter using the username@host format. There is no -l option for this
command.
After the correct password is entered, scp starts the data transfer and shows a growing
row of asterisks to simulate a progress bar. In addition, the program displays the esti-
mated time of arrival to the right of the progress bar. Suppress all output by giving the
option -q.
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Installation and Administration
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Troubleshooting
