42-minishell: A mini UNIX command interpreter

The objective of this project is to create the simplest shell.

Mandatory part functionality:

• The execution of simple command lines, no pipes, no redirections or any other advanced functions;
• the executable are those can be found in the paths indicated in the PATH variable;
• in cases where the executable can not be found, the shell has to show an error message and display the prompt again;
• the errors must be managed without using errno, by displaying a message adapted to the error output;
• the PATH and the environment (copy of system char**environ) must be correctly dealt with;
• a series of builtins must be implemented: echo, cd, setenv, unsetenv, env, exit;

Allowed functions for mandatory part:

• malloc, free
• access
• open, close, read, write
• opendir, readdir, closedir
• getcwd, chdir
• stat, lstat, fstat
• fork, execve
• wait, waitpid, wait3, wait4
• signal, kill
• exit

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Bonus functionality implemented:

• Management of signals: 'Ctrl-C', 'Ctrl+\' (the use of global variables is allowed for this bonus);
• the separation of commands with ";";