The objective of this project is for you to create a simple shell. Yes, your own little bash or zsh. You will learn a lot about processes and file descriptors.

• Khaoula NABOUSSI => LinkedIN
• Mojahid BELAMAN   => LinkedIn

• Not use more than one global variable, think about it and be ready to explain why you do it.

• Show a prompt when waiting for a new command.

• Search and launch the right executable (based on the PATH variable or by using relative or absolute path) like in bash.

• It must implement the builtins like in bash:

  - echo with option ’-n’
  
  - cd with only a relative or absolute path
  
  - pwd without any options
  
  - export without any options
  
  - unset without any options
  
  - env without any options and any arguments
  
  - exit without any options
  

• ; in the command should separate commands like in bash

• ’ and " should work like in bash except for multiline commands

• Redirections < > “>>” should work like in bash except for file descriptor aggregation

• Pipes | should work like in bash except for multiline commands

• Environment variables ($ followed by characters) should work like in bash

• $? should work like in bash

• ctrl-C, ctrl-D and ctrl-\ should have the same result as in bash

• Use up and down arrows to navigate through the command using termcap (mandatory) history which we will then be able to edit (at least like we can for classic lines) if we feel like it (the line, not the history).

printf, malloc, free, write, open, read, close, fork, wait, waitpid, wait3, wait4, signal, kill,
exit, getcwd, chdir, stat, lstat, fstat, execve, dup, dup2, pipe, opendir, readdir, closedir,
strerror, errno, isatty, ttyname, ttyslot, ioctl, getenv, tcsetattr, tcgetattr, tgetent, tgetflag,
tgetnum, tgetstr, tgoto, tputs

1. make
2. ./minishell
3. Run commands