useful "scp" commands to trasfer files

scp commands

# Copy ssh key to a remove server
#################################

    ssh-copy-id LOCAL_PATH_TO_THE_KEY  USER_NAME@REMOTE_HOST:REMOTE_LOCATION 
    
    # ssh-copy-id may not be installed in the remote server. In that case, First create .ssh directory on remote server 
    ssh USER_NAME@REMOTE_HOST:REMOTE_LOCATION  "umask 077; test -d .ssh || mkdir .ssh"

	  ## cat local public key file and pipe over ssh to append the public key in the remote serve. Example-
	  cat ~/.ssh/id_rsa.pub | ssh user@remote_ip_or_hostname "cat >> .ssh/authorized_keys"



# Copy file to the remote system
#################################

# Basic scp command
	# From host to remote
	scp source_file_name dst_username@destination_host:destination_folder
  
	# From remote to host
	scp dst_username@destination_host:destination_file ~/my_local_file.txt
	# or just download the file
	scp [email protected]:/some/path/file.txt

# Transfer multiple files
	# From host to remote
	scp foo.txt bar.txt username@remotehost:/path/directory/
	
	# From remote to host
	scp username@remotehost:/path/directory/\{foo.txt,bar.txt\}
	# or just download
	scp [email protected]:~/\{abc.log,cde.txt\} 
 
# To copy recusively use '-r' parameter
	scp -r ~/Downloads [email protected]:/root/Downloads

# Copy across two remote host
	scp user1@remotehost1:/some/remote/dir/foobar.txt user2@remotehost2:/some/remote/dir/

# For verbose output use the '-v' parameter
  scp -v Label.pdf [email protected]:.

# Speed up file transfer by using '-C'(Capital) to compress
	scp -vrC ~/Downloads [email protected]:/root/Downloads

# Limit bandwidth for transfer by using 'l' parameter
	scp -vrC -l 400 ~/Downloads [email protected]:/root/Downloads				# bandwidth 4 kibt/s

# Connect to different port number on remote host
	scp -vC -P 2200 ~/test.txt [email protected]:/some/path/test.txt				# remote port 2200

# '-p' option (smallcase), would preserve modification times, access times, and modes from the original file.
	scp -C -p ~/test.txt [email protected]:/some/path/test.txt

# To use specific key file use '-i' option
	scp -vCq -i private_key.pem ~/test.txt [email protected]:/some/path/test.txt

# To use different ssh_config file specify the file using '-F' option
	scp -vC -F /home/user/my_ssh_config ~/test.txt [email protected]:/some/path/test.txt

# Speed up the transfer by using different encryption(default AES). '-c' option to choose different cypher
	scp -c blowfish -C ~/local_file.txt username@remotehost:/remote/path/file.txt