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42sh!

What is it ?

The 42sh is our end of first year project at Epitech. We have to reproduce a shell based on tcsh with redirections, pipes, separators and environment

Bonuses

After reproducing the minimal requirements we had carte blanche to have fun and implement new features (some basics of them are strongly suggested)

Here is what we implemented:

  • @ [variable[=[expression]]]

    Assign the expression to variable

  • @ variable++

    Increment variable by 1.

  • @ variable--

    Decrement variable by 1.

    Note : please notice that we temporary remove the variable replacement in command-line parsing in order to prevent some crashes. We are currently fixing it.

  • alias [name [command]]

    Assign name as alias for command If name is omitted print all alias

  • alias [rm [name]]

  • unalias [name]

    Remove the alias on name

  • builtins

    Display all builtins

  • cd [-|dir]

    Change working directory to dir If - is the first arg returns to the previous working directory

  • chdir [-|dir]

    Same as cd

  • echo [-n] string

    Write string to stdout. If -n is specified the output is not terminated by a newline.

  • exit [num]

    Exit the shell whith an exit value of num If num is unspecified exit with a status of zero

  • fg [jobID]

    bring the current jobID to the foreground

  • history [d|del|delete [num]] [clear]

    List all commands in history If a delete option is specified deletes the num command from history If clear is specified clears the history

  • jobs [-l]

    List all running jobs If -l specified includes process id

  • printenv [variable]

    Print all (or one specified) environment variables and their values.

  • repeat [n command]

    repeats the command n times

To see further : JARVIS feature

We implemented a correcter (JARVIS corrector) in our shell. Currently, in case of wrong command, this corrector suggest the closest correct command or argument to the user input.

In the future we may improve this corrector to make it more performing.

Originally, we also wanted to implement a bigger feature : JARVIS micro. Thanks to the Google API Speech, our shell should have been able to be controlled only with voice (nevertheless keeping the classical command-line).

However, time played a crucial role in the development of this project, and in order to release our 42sh before the deadline, we gave up the JARVIS micro feature. But not forever...

Important: No CPU was abused during the development of this project.