pwd
print working director
hostname
My Computer Network Name
mkdir
make directory
cd
change directory
ls
list directory
rmdir
remove directory (if empty)
pushd
push directory
popd
pop directory
cp
copy a file / directory
mv
move a file / directory
less
page through a file
cat
print the whole file
xargs
execute arguments
find
find files
grep
find things inside files
man
read a manual page
apropos
find which manual page is appropriate
env
look at your environment
echo
print some arguments
export
export / set a new environment variable
exit
exit the shell
sudo
become super user root (DANGER!)
rm -rf
remove directory with items
mkdir -p
create path with more than 1 new directories