SCP command details

In common cases, say first ：

Two machines IP Respectively ：A.104.238.161.75,B.43.224.34.73.
stay A Operation on the server , take B Server /home/lk/ All files in the directory are copied to the local /root Under the table of contents , The order is ：scp -r [email protected]:/home/lk /root.

stay A On the server /root/lk All the files in the directory are transferred to B Of /home/lk/cpfile Under the table of contents , The order is ：scp -r /root/lk [email protected]:/home/lk/cpfile.

scp When copying across machines, in order to improve the security of data , Used ssh Connection and encryption , If the machine is configured with ssh Password free login , That's in use scp You don't have to enter a password when you're in .
Detailed command ：
scp yes secure copy Abbreviation , Used in Linux Under the command to copy files remotely , Similar orders are cp, however cp It's just that copying on the local machine can't cross servers , and scp The transmission is encrypted . It may affect the speed a little . When your server hard disk becomes read-only read only system when , use scp I can help you move the files out . in addition ,scp It doesn't take up resources , It will not increase the system load much , At this point ,rsync It's far less than that . although rsync Than scp It will be faster , But when there are lots of small files ,rsync It will cause the hard disk I/O Very high , and scp Basically does not affect the normal use of the system .
1． Command format ：
scp [ Parameters ] [ The original path ] [ The target path ]
2． Command function ：
scp yes secure copy Abbreviation , scp yes linux Based on ssh Log in for secure remote file copy command .linux Of scp Commands can be found in the linux Copy files and directories between servers .
3． Command parameter ：
-1 mandatory scp Command usage protocol ssh1
-2 mandatory scp Command usage protocol ssh2
-4 mandatory scp The command only uses IPv4 Addressing
-6 mandatory scp The command only uses IPv6 Addressing
-B Use batch mode （ Do not ask for transmission password or phrase during transmission ）
-C Allow compression .（ take -C The sign is passed on to ssh, To turn on compression ）
-p Keep the modification time of the original document , Access time and access rights .
-q Do not show transfer progress bar .
-r Recursively copy the entire directory .
-v Detailed display output .scp and ssh(1) The debugging information of the whole process will be displayed . This information is used to debug connections , Validation and configuration issues .
-c cipher With cipher Encrypt the data transmission , This option will be passed directly to ssh.
-F ssh_config Designate an alternative ssh The configuration file , This parameter is passed directly to ssh.
-i identity_file The key file used to read the transfer from the specified file , This parameter is passed directly to ssh.
-l limit Limit the bandwidth that users can use , With Kbit/s In units of .
-o ssh_option If you are used to using ssh_config(5) Parameter passing method in ,
-P port Notice that it's capital P, port Is the port number used for data transmission
-S program Specify the program to use when encrypting the transmission . This procedure must be able to understand ssh(1) The option to .
4． Using examples ：
scp Overview of practical application of command ：
Copy from local server to remote server ：
(1) Copy file ：
Command format ：
scp local_file remote_username@remote_ip:remote_folder
perhaps
scp local_file remote_username@remote_ip:remote_file
perhaps
scp local_file remote_ip:remote_folder
perhaps
scp local_file remote_ip:remote_file
The first 1,2 User name specified , After the command is executed, you need to enter the user password , The first 1 Only remote directories are specified , The file name does not change , The first 2 Specified file name
The first 3,4 No user name specified , After the command is executed, you need to enter the user name and password , The first 3 Only remote directories are specified , The file name does not change , The first 4 Specified file name
(2) duplicate catalog ：
Command format ：
scp -r local_folder remote_username@remote_ip:remote_folder
perhaps
scp -r local_folder remote_ip:remote_folder
The first 1 User name specified , After the command is executed, you need to enter the user password ;
The first 2 No user name specified , After the command is executed, you need to enter the user name and password ;