cd nameFile (change directory)
ls (list the contents of directory)
whoami (display name user)
echo "hello" (display "hello")
mkdir nameDirectory (create directory)
touch nameFile (create file)
cp fileEarly fileEnd (copy a file)
sudo (be in mode root)
rm nameFile (delete file)
rmdir nameDirectory (delete directory and his contents)
rmdir nameDirectory -f (delete directory with force don't use )
chmod 777 nameFile or nameDirectory (gives the right in write, read and execution)
chmod +x nameFile or nameDirectory (gives the right in execution)
chmod -x nameFile or nameDirectory (delete the right in execution)