Secure Socket Shell is a protocol that allows a secure way to access remote computer.
SSH implementation comes with
scp utility for remote file transfer that utilises
SSH protocol. Other applications such as
rsync can also make use of
SSH to secure its network transaction.
All these applications allow us to copy our local files to remote server and to copy files from remote server to our local machine. Below are examples on how to use these applications for files transfers based on this setup:
Make sure you have access right to the remote server and correct permission to the remote files and folders
The easiest of these are
secure copy. While
cp is for copying local files,
scp is for remote file transfer. The main difference is that with
scp you'll have to specify the remote host's
DNS name or
IP address and provide login credential for the command to work.
$ scp myfile.txt remoteuser@remoteserver:/remote/folder/
$ scp remoteuser@remoteserver:/remote/folder/myfile.txt myfile.txt
$ scp myfile.txt myfile2.txt remoteuser@remoteserver:/remote/folder/
$ scp * remoteuser@remoteserver:/remote/folder/
$ scp -r * remoteuser@remoteserver:/remote/folder/
remoteuser need to exist and have write permission to
/remote/folder/ in the remote system.
Secure FTP in the other hand works almost exactly like
ftp but with secure connection. Most of the commands are similar and can be used interchangeably. The following
sftp example will work exactly as
$ sftp email@example.com Connected to 192.168.1.10. sftp> dir file1 file2 file3 sftp> pwd Remote working directory: /home/user sftp> get file2 Fetching /home/user/file2 to file2 /home/user/file2 100% 3740KB 747.9KB/s 00:05 sftp> bye $
You can also use
ssh to secure your
rsync session. To do this, use
-e “ssh” with your normal
rsync commands. The following 2 commands will work exactly the same;
$ rsync -av --delete --rsh=ssh /path/to/source firstname.lastname@example.org:/remote/folder/ $ rsync -av --delete -e "ssh" /path/to/source email@example.com:/remote/folder/
If these options are not specified,
rsync will first try to connect to
rsyncd but will automatically fallback to
rsyncd is not running in the remote system.
This course is made for Linux admins who seek to secure their Linux work environment by mastering Linux SSH security!