Operating system: Introduction to SFTP related knowledge

Today I will share with you some knowledge about SFTP, I hope it will be helpful to you!

1. What is SFTP?

SFTP (SSH File Transfer Protocol) is a secure file transfer protocol based on SSH (Secure Shell). Using the SFTP protocol can provide a secure network encryption algorithm during file transfer, thereby ensuring the secure transmission of data. In the Linux operating system, the default port of SFTP is 22. The transmission provides a password and key authentication mechanism, which can effectively prevent threats and public technology during the transmission process.

2. SFTP Composition

Server: The host where the SFTP service is installed, usually a Linux server. Windows servers can also install the SFTP service through software, such as freeSSHd software. Client: The client that installs the software to access the SFTP server, such as XFTP, WinSCP, FileZilla, FlashFXP and other clients.

3. SFTP verification connection method

• Account and password verification: Use account ID and password for verification, and the credentials are encrypted during the verification process.
• SSH key authentication: Authentication is performed using an SSH password.
• Account password + SSH key mixed verification: Both verifications must be met before a connection can be made.

4. Common SFTP commands

4.1 Login

 #Password login
 sftp -P 22 [email protected]
 #Key login
 sftp -P 22 -i ~/.ssh/id_rsa [email protected]

4.2 Basic Operations of SFTP Shell

 #Current working directory:
 pwd
 #View the files in the current directory:
 ls
 ls -la
 # Change directory:
 cd
 #Local working directory:
 lpwd
 #View the files in the local working directory:
 lls
 #Switch the local working directory:
 lcd dirname

4.3 Download server files to local

 #Download the server file to local
 get remote_file_name
 #Rename
 get remote_file_name local_file_name
 #recursion
 get -r some_directory_name
 #Keep the original file attributes and date
 get -Pr some_directory_name

4.4 Upload local files to remote server

 #Upload local files to the remote server
 put localFile
 #recursion
 put -r local_directory_name