minishell project

hey, this is our minishell project. its basically a small version of bash that we wrote in C. we learned alot about processes and file descriptors while making this. it works like a real shell, you can type comands and it executes them. we used a tree structure for parsing which was kinda hard but it works good now.

features

we implimented all the mandatory stuff asked in the subject:

• prompt: shows a prompt when waiting for a new comand.
• history: working history so you can use up/down arrows.
• system excutables: searches for binaries in the $PATH or absolute path.
• signals: handles ctrl-C, ctrl-D and ctrl-\ like bash does.
• parsing: handles single quotes ' (literal) and double quotes " (interprets $).
• pipes: you can use | to pipe commands together.
• rederections:
  • < redirects input.
  • > redirects output.
  • >> redirects output in append mode.
  • << heredoc (reads input until a delimiter).
• enviroment varibles: handles $VAR expansion and $? for exit status.

builtins

we made our own versions of these comands:

• echo (with -n option)
• cd (changes dircetory)
• pwd (print working directory)
• export (add varibles to env)
• unset (remove varibles)
• env (print enviroment)
• exit (exits the shell)

bonus part

we also did the bonus part:

• logic operators: supports && and ||.
• wildcards: the * works for the current directory.
• priority: handles parenthesis () for priority in logic operations.

instalation

its easy to run. first make sure you have readline installed.

1. clone the repo.
2. compile it with make:

make

3. run the executable:

./minishell

cleaning up

if you want to remove the object files you can run make clean. if you want to remove everything including the program run make fclean

authors

zelkalai ayel-mou