chmod
Changes file and folder permissions
chmod -R 775 foldername
chown
Changes user and group
chown -R user:usergroup
top
Displays all of the top processes in the system
top
more
Displays docs in gallery
more /etc/*release
nano
text editor for files
nano filename
nano directoryname/filename
ifconfig
shows ip addresses and connections
ifconfig
ip addr
shows ip addresses
ip addr
free
Gives memory stats
free -h
uname
Gives kernel version
uname -a
service
Start, stop and status for a service
service servicename start
service servicename restart
service servicename reload
service servicename status
service servicename stop
lsof
Gives open services
lsof -i
history
Shows command history
history