top		#shows processes
ls		#lists files/directories
dir		#lists directories
cd		#change directory
rmdir	#removes directory
rm		#removes file
df [option] /path -h -a		#displays available disk space
[cmd] | grep [text]		#filters text
ps -Al | grep apache2		#shows currently running services
service --status-all		#shows installed/noninstalled applications


#to locate largest files within tree
du -sh * | sort -hr | head -n10

#to locate largest directories within tree
du . -sh * | sort -hr | head -n10


/sbin/reboot
/sbin/shutdown -r now
sudo reboot



to filter through uniq values:
echo -e "file" | sort | uniq

grep "" "file" | sort | uniq


chown owner file


#to change password:
passwd (to change the password for currently logged in user)
sudo passwd user (to change the password for a new user)