Misc
startx
sudo
crontab
Files management
cd
mv
ls
mkdir
cp
cat
rm
rmdir
tar
nano
Network
ifconfig
ping
namp
Hostname
Iwconfig
File transfer
wget
System/Software updates
apt-get
rpi-update
System management
reboot
shutdown -h now
ps aux
kill [PID]
Raspbian commands
raspi-config
raspistill
raspivid
raspi-gpio
Source:
https://www.raspberrypi.org/documentation/linux/usage/commands.md