Linux command

Copy from local to remote

scp filename username@ip_address:directoryToCopy

copy from remote to local

scp username@ip_address:filename directoryToCopy
scp -P port username@ip_address:filename directoryToCopy

remote using ssh

ssh username@ip_address

compress to tar

tar -zcvf filename.tar.gz directory_to_compress

uncompress tar

tar -zxvf {file.tar.gz}