# Basic Linux commands | COMMAND | DESCRIPTION | WHY THE NAME? | | --- | --- | --- |

man	Show help (the manual)	manual
which	Find out where a command is	which location?
--help	Find help on any command	help!
Ctrl+C	Stop the current program
logout	Exit the current login shell
passwd	Change your password	password
sudo	Execute a command as a superuser	super-user do
ssh	Create an SSH connection (a terminal) to a server	secure shell
cd	Change the current directory (folder)	change directory
ls	List files in a directory	list
mkdir	Make/create a new directory	make directory
pwd	Print current directory	print working directory
cp	Copy files and directories	copy
rm	Delete files and directories	remove
cat	Print the contents of a file	concatenate
chmod	Change the permissions of a file or directory	change mode
chown	Change the owner and group of a file or directory	change owner
diff	Show the difference between two files	difference
file	Show the type of a file
less	Browse the contents of a file	opposite of 'more'
locate	Find files with names matching a pattern
tail	Print the last few lines of a file	tail end (of something)
touch	Create a new file or update an existing one
apt	Install and manage packages in Ubuntu	Advanced Package Tool
curl	Get a web page or API	client URL
dig	Look up DNS information	domain information gather
ip addr	Show your network configuration	IP address
ping	Check to see if a server is alive
kill	Terminate a program (process)
top	Show the top processes	table of processes
ps	List running processes	processes
Ctrl+Z	Suspend a process
fg	Resume a process	foreground
jobs	Lists all active jobs (processes)
date	Show the current date and time
df	Show free disk space	disk free
du	Show disk space usage	disk used

shutdown	Halt or reboot your machine
uname	Print system information	UNIX name
uptime	Show how long the system has been running