Try the following commands:
    ls
    ls -a
    ls -l
    echo "hello"
    echo -n "hello"
    echo `date`
    echo `date +%m%d%y-%H%M%S`
    cat /etc/os-release
    more /etc/os-release
    mkdir tmp
    pwd
    cd tmp
    pwd
    ls
    cd ..
    cp /etc/os-release tmp
    cp tmp/os-release tmp/abc
    ls -aF tmp
    mv tmp/os-release tmp/xyz
    ls -aF tmp
    diff tmp/abc tmp/xyz
    man gcc
    rm tmp/abc
    touch tmp/defg
    ls -alF tmp
    ps -x
    ps -auxw
    pico tmp/xyz
    rm tmp/defg tmp/xyz
    ls -alF tmp
    rmdir tmp
    ls -alF tmp
    df
    top
    exit