Useful Linux commands, with no particular order

sudo lsof -i:port

sudo kill -9 PID

du -hs .

df -h

More info: https://www.ssh.com/ssh/tunneling/example/

ssh-copy-id user@server

ssh -L local-port:localhost:remote-port user@server -N

Note: AllowTcpForwarding and PermitOpen have to be enabled in /etc/ssh/sshd_config

ssh -N -T -R local-port:localhost:remote-port user@server

• -N Do not execute a remote command. This is useful for just forwarding ports.
• -T Disable pseudo-terminal allocation.
• -R Specifies that connections to the given TCP port or Unix socket on the remote (server) host are to be forwarded to the local side.

scp -r /folder/to/upload user@server:/destination/on/server

tar -czvf file.tar.gz file/or/folder/to/tar/

• -c create
• -z gzip
• -v verbose
• -f filename

tar -xvf file.tar.gz

• -x extract
• -v verbose
• -f filename

gpg -c --cipher-algo AES256 file/to/encrypt

You will be asked to enter a password

gpg file/to/decrypt

You will be asked to enter a password