How can I copy a file or folder using the `scp` command in Linux?

To copy files or folders using the scp command in Linux:

1. Transferring a File from Local to Remote
   Specify the file’s location on your local system, the remote system’s username, address, and the destination path on the remote system.
2. Transferring a File from Remote to Local
   Indicate the file’s location on the remote system, along with its username and address, and the target path on your local machine.
3. Copying a Folder
   Use a recursive option to include all files and subdirectories when copying a folder. You can transfer folders in either direction (local to remote or remote to local).
4. Custom Options
   You can specify:
   • A custom SSH port if the remote server doesn’t use the default.
   • Compression for faster transfers.
   • A specific private key for authentication if needed.
5. Authentication and Permissions
   Ensure SSH is configured on the remote system. You’ll be prompted for the password unless you’ve set up key-based authentication.

This method works over a secure connection, making it reliable for transferring data.