Find my IP address

$ ifconfig
$ hostname -I
$ ip addr

Test network connections

$ ping localhost

Connect to wifi ports

$ nmcli dev wifi list  # network manager command line interface (nmcli)
$ nmcli dev wifi connect JASMINE
$ nmcli dev wifi connect TELLO-591FFC
$ nmcli connection
$ sudo nmcli connection modify TELLO-591FFC connection.autoconnect yes

Login to remote machines
ssh - Replaces rlogin and rsh.

$ ssh -p 7822 voyccom@az1-ss8.a2hosting.com

Copy files between remote machines
SFTP - A protocol to do file transfer over SSH, emulating FTP syntax.
SCP - A protocol to do file transfer over SSH, emulating the syntax of rcp in BSD Unix.

$ scp from.txt to.txt
$ scp username@host:path/* .
$ scp . username@host:path/
$ scp -pr -P 22 jhagstrand@web612.webfaction.com:db_archive .
$ scp -pr -P 7822 voyccom@az1-ss8.a2hosting.com:webprod/mai/config.ini .

SCP options
-P remote-port
-p preserve files modification and access times
-r copy directories recursively