Project name : minishell

For this project, the assignment is :

This project is about creating a simple shell. Yes, your own little bash. You will learn a lot about processes and file descriptors.

It is a team project where you will create a basic shell program in C. It implements redirections and pipes, as well as environment variable expansions and the cd, echo, env, exit, export, pwd and unset builtin commands.

Minishell is a miniature shell program based on Bash. Minishell supports:

• Prompt display
  
• Command history (up and down arrows)
  
• System executables available from the environment (ls, cat, grep, etc.)
  
• Local executables (./minishell)
  
• Builtin commands :
  echo (and option -n)
  cd (with only a relative or absolute path)
  pwd(no options)
  export (no options)
  unset (no options)
  env (no options or arguments)
  exit (with exit number but no other options)
  
• Pipes | which redirect output from one command to input for the next
  
• Redirections:
  >redirects output
  >> redirects output in append mode
  < redirects input
  << DELIMITER displays a new prompt, reads user input until reaching DELIMITER, redirects user input to command input (does not update history)
  
• Environment variables (i.e. $USER or $VAR) that expand to their values.
  $? expands to the exit status of the most recently executed foreground pipeline.
  
• User keyboard signals:
  ctrl-c displays a new prompt line.
  ctrl-d exits minishell
  ctrl-/ does nothing
  However, Minishell does not support /, ;, &&, ||, or wildcards.

Usage

In order to compile : make

Execution : ./minishell (anything from listed above)

Exemple = ./minishell cat Makefile | grep o > out