Print working directory
pwd
My computer’s network name
hostname
Make directory
mkdir
Change directory
cd
List directory
ls
Remove directory
rmdir
Push directory
pushd
Pop directory
popd
Copy a file or directory
cp
Move a file or directory
mv
Page through a file
less
Print the whole file
cat
Execute arguments
xargs
Find files
find
Find things inside files
grep
Read a manual page
man
Find which manual page is relevant
apropos
Look at your environment
env
Print some arguments
echo
Export/set a new environment variable
export
Exit the shell
exit
DANGER! Become super user root DANGER!
sudo
Change permission modifiers
chmod
Change ownership
chown