pwd
    ls
    cd CSE390
    pwd
    ls
    cd ~
    pwd
    cd /home/josh/Desktop
    ls
    cd ~
    cd ~/Desktop
    cd ..
    cd ./Desktop
    cd ~
    cd Desktop
    cd ..
    ls
    ls -l
    ls -lar
    ls -l -a -r
    clear
    ls  -l -a -r
    man ls
    man man
    ls  --help