Linux in a Nutshell, Fifth Edition

ssh | 431

Linux

Commands

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--help

Print a help message and then exit.

--verbose

Print a message for each output file.

--version

Print version information and then exit.

Examples

Break bigfile into 1000-line segments:

split bigfile

Concatenate four files, then split them into 10-line files named

new.aa, new.ab, and so on. Note that without the -, new. would be

treated as a nonexistent input file:

cat list[1-4] | split -10 - new.

ssh

ssh [options] hostname [command]

Securely log a user into a remote system and run commands on

that system. The version of ssh described here is the OpenSSH

client. ssh can use either Version 1 (SSH1) or Version 2 (SSH2) of

the SSH protocol. SSH2 is preferable, as it provides stronger

encryption methods and greater connection integrity. The host-

name can be specified either as hostname or as [e-mail]

command is specified, the user is authenticated, the command is

executed, and the connection is closed. Otherwise, a terminal

session is opened on the remote system. See “Escape characters,”

later in this section, for functions that can be supported through an

escape character. The default escape character is a tilde (~). The

exit status returned from ssh is the exit status from the remote

system, or 255 if there was an error.

Commonly, authentication is handled with ...