Command	Description
df	Display filesystem space
du	Disk usage
free	Free memory usage display
w	Which users are logged in?
whoami	Whoami logged in as?
hostname	List the hostname of the machine
uname	Print kernel information
quota	Quotas and limits of users
passwd	Set/change a users password
chage	Force user to change password
adduser	Add new user
usermod	Modify a user
addgroup	Add a new group
userdel	Delete user
delgroup	Delete a group

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