39.3 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 estimated time of arrival to the right of the
progress bar. Suppress all output by giving the option
-q.
scp also provides a recursive copying feature for entire directories. The
command
scp -r src/ sun:backup/
copies the entire contents of the directory src
including all subdirectories to the backup directory
on the host sun. If this subdirectory does not exist yet, it is
created automatically.
The option -p tells scp to leave the time stamp of files
unchanged. -C compresses the data transfer. This minimizes
the data volume to transfer, but creates a heavier burden on the processor.