SHell

    Present on all linux platforms, and more minimalist than bash.

    Options

    List options for shell: set -o

    Note: usefull to disable history, or enable errexit, notify, etc...

    To set variable: set +o variableName

    To unset variable: set -o variableName

    See also SHOPT (official doc)

    Usefull example of shopt: shopt -s cdspell

    So now if you type:

    cd /Etc # or cd /etccccc
    

    You will ending in /etc directory

    Hello Summary

    # conditions 
    if test 5 -ge 0; then
      echo "positive" # positive
    else
      echo "negative"
    fi