pwd
print working directory
hostname
this computer’s network name
mkdir
make directory
cd
change directory
ls
list directory
rmdir
remove directory
pushd
push directory
popd
pop directory
cp
copy a file or 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
apropros
find what man page is appropriate
env
look at your environment
echo
print arguments
export
export/set a new environment variable
exit
exit the shell
sudo
become super user root (DANGER!!!!!)