SCP is one of the useful tool to transfer file between one server to another.

scp file.txt root@8.8.8.8:/usr/local/src/

How to scp with port number? 

scp file.txt root@8.8.8.8:/usr/local/src/

As all you know SCP command is used to copy file(s) between servers in secure way. The basic syntax of the SCP command is as follows,

scp source_file_name username@destination_host:destination_folder

For example,

scp file.txt root@8.8.8.8:/usr/local/src/

This command will copy the file named file.txt to the remote server location /usr/local/src/

You can use the scp command with providing port name with the command. For that use the syntax,

scp -P portnumber filename your_username@remotehost:destnation_folder

For example,

scp -P 2555 file.txt root@1.2.3.4:/usr/local/src/

If you want to recursively copy one entire folder from one server to another please use following command.

scp -r folder username@destination_host:destination_folder

You can use below command to transfer one folder to another server Recursively with custom port.

scp -p 2555  -r folder username@destination_host:destination_folder

Thats all