Network

External ip

curl ifconfig.me
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dig +short myip.opendns.com @resolver1.opendns.com
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netcat icanhazip.com 80 <<< $'GET / HTTP/1.1 Host: icanhazip.com ' |  tail -n1
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Get wifi password

cat /etc/NetworkManager/system-connections/[SSID] |  grep psk=
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List network interfaces

lspci |  egrep -i --color 'network|ethernet'
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ifconfig -a
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ip link show
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lshw -class network
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cat /proc/net/dev
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Download file

wget [url]
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curl -O [url]
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Get information about domain

whois [ip]
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Ping to another device

ping [ip]
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Configure network interface

Show the hostname of your box

hostname [ip]
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Trace the path that a packet takes to its destination

traceroute [ip]
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Telnet connection

telnet [ip] [port]
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DNS lookup and display server answer

dig [ip]
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Release ip and get a new one from DHCP

dhclient -r
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List open sockets

netstat -l
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lsof -i
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