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Arcom Embedded Linux Technical Manual Secure Shell (SSH)

As well as logging in to a remote machine, ssh can run a command on a remote

machine without the need to login and run it manually. To do this, append the command

to the ssh command line. For example, to examine the contents of the /bin/ folder on a

remote system you might enter:

When you use ssh to run a remote command, quote shell meta characters that

you want to be passed to the remote system rather than processed locally.

The scp command

The scp command is similar to the regular cp command, except that it uses the SSH

protocol and allows for the source or destination file to be located on a remote system.

You can specify a remote file as follows:

user@host:file

The user@host part is the same as for the ssh command, described in the previous

section. If you don’t specify a file, or you give a relative path (i.e. one which doesn’t

start with /), the default is the remote user’s home folder. If you forget the colon (:), scp

will copy to or from a local file named user@host. This is rarely required.

For example, the following command copies ‘my-file’ to /home/arcom on the remote

system ael.example.net:

The following command copies the same file to /etc/ on the remote host:

$ scp my-file [email protected]:/etc/my-file

To retrieve a remote file, reverse the order of the operands. For example, the following

retrieves /home/arcom/my-file from the remote system:

The sftp command

The sftp command behaves like the regular ftp command, except that it uses the SSH

protocol to provide the strong authentication and encryption that regular FTP lacks. You

can specify a user and hostname using the user@host syntax described in the

previous section, for example:

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Eurotech ZEUS Manual de usuario Pagina 26