0-Shell

0-Shell is a minimal Unix-like shell written in Rust. It mimics the behavior of sh and supports basic commands with a focus on learning system programming concepts, including file handling, metadata inspection, and process management.

---

Features

• Execute standard shell commands: echo, pwd, cd, ls, exit.
• ls implementation mimics GNU ls -al formatting:
  • Displays permissions, owner, group, size, modification time.
  • Supports hidden files and symbolic links.
  • Case-insensitive sorting, ignoring leading symbols for alphabetic order.
  • Correctly handles . and .. entries.
• Safe printing to handle broken pipes (prevents panics).
• Simple command parsing with multi-line input support for quoted strings.

---

Usage

1. Clone the repository:

git clone <repo_url>
cd zero-shell

2. Build and run the shell:

cargo run

3. Example commands:

~$ pwd
/home/user

~$ ls -al
drwxr-xr-x   5 user  user      4096 Aug 27 12:09 .
drwxr-xr-x  23 user  user      4096 Aug 25 13:00 ..
-rw-r--r--   1 user  user         0 Aug 26 17:50 example.txt

---

Project Structure

• src/main.rs — Entry point and main loop.
• src/lib.rs — Core functions (command handlers, ls, utilities).
• src/ls.rs — Implementation of ls command, including metadata formatting and sorting.

---

Notes

• This shell is for learning purposes and does not support advanced shell features like piping, redirection, or background processes yet.
• The sorting logic in ls is inspired by GNU ls and uses case-insensitive comparison and leading-symbol ignoring to approximate the correct order.

---

License

MIT License