Network

External IP

$ curl ifconfig.me

$ dig +short myip.opendns.com @resolver1.opendns.com

$ netcat icanhazip.com 80 <<< $'GET / HTTP/1.1\nHost: icanhazip.com\n' | tail -n1

Get WiFi password

$ cat /etc/NetworkManager/system-connections/[SSID] | grep psk=

List network interfaces

$ lspci | egrep -i --color 'network|ethernet'

$ ifconfig -a

$ ip link show

$ lshw -class network

$ cat /proc/net/dev

$ nmcli device status

Download file

$ wget [url]

$ curl -O [url]

$ aria2c [url]

$ axel [url]

Get information about domain

$ whois [ip]

Ping another device

$ ping [ip]

$ mtr [ip]

Configure network interface

$ ifconfig

Show the hostname of your box

$ hostname

$ hostnamectl

Trace the path that a packet takes to its destination

$ traceroute [ip]

$ tracepath [ip]

Telnet connection

$ telnet [ip] [port]

DNS lookup and display server answer

$ dig [ip]

$ nslookup [ip]

$ host [ip]

Release IP and get a new one from DHCP

$ dhclient -r

List open sockets

$ netstat -l

$ lsof -i

$ ss -l

Show routing table

$ ip route

$ route

Show open ports

$ ss -tuln

$ netstat -tuln

Test port connectivity

$ nc -zv [host] [port]

Show bandwidth usage

$ iftop

$ nethogs

$ vnstat

$ bmon

$ nload