https://github.com/ekkoz897/42cursus_minishell

42 - Rewrite a simple shell
https://github.com/ekkoz897/42cursus_minishell

42 42born2code 42project bash minishell minishell42 parsing shell

Last synced: about 1 month ago
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42 - Rewrite a simple shell

• Host: GitHub
• URL: https://github.com/ekkoz897/42cursus_minishell
• Owner: Ekkoz897
• Created: 2023-03-23T17:35:41.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-03-21T18:27:27.000Z (9 months ago)
• Last Synced: 2024-03-21T19:42:05.851Z (9 months ago)
• Topics: 42, 42born2code, 42project, bash, minishell, minishell42, parsing, shell
• Language: C
• Homepage:
• Size: 566 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# 42-minishell

The objective of this project is to create a simple shell, like an own little bash.


It is the first group project in the 42 core curriculum. 

## Project specifications

For the project we were allowed to use GNU's readline library which handles the terminal interaction (history & input reading).

For everything else the subject allows only to use a few low-level functions and a few POSIX system calls.

Allowed functions:

```readline, rl_clear_history, rl_on_new_line,rl_replace_line, rl_redisplay, add_history, printf, malloc, free, write, access, open, read,close, fork, wait, waitpid, wait3, wait4, signal, sigaction, sigemptyset, sigaddset, kill, exit, getcwd, chdir, stat, lstat, fstat, unlink, execve, dup, dup2, pipe, opendir, readdir, closedir, strerror, perror, isatty, ttyname, ttyslot, ioctl, getenv, tcsetattr, tcgetattr, tgetent, tgetflag, tgetnum, tgetstr, tgoto, tputs```

## Features

### Basics:

- History of previous entered commands

- Search and launch the right executable (based on the PATH variable, using a relative or an absolute path)

- Environment variables ($ followed by a sequence of characters) expand to their values

- Wildcards * in the current working directory

- ctrl-C, ctrl-D and ctrl-\ behave like in bash

- ```’``` (single quotes - prevent from interpreting meta-characters in quoted sequence)

- ```"``` (double quotes - prevent from interpreting meta-characters in quoted sequence except for $)

- ```$?``` expands to the last exit status

- ```|``` connect cmds or groups with pipes; output of a cmd is connected to the input of the next cmd via a pipe

- ```&&``` and ```||``` with parenthesis for priorities

### Builtins:

- ```echo``` with option -n

- ```cd``` (relative or absolute path, ```-``` for OLDPWD, without arg for HOME)

- ```pwd``` without options

- ```export``` without options

- ```unset``` without options

- ```env``` without options

- ```exit [exit_status]``` without options

### Redirections:

```[n]``` (optional) specifies the file descriptor, if not specified it is stdout/stdin

- ```[n]< file``` Redirecting Input

- ```[n]<< limiter``` Here Documents

- ```[n]> file``` Redirecting Output

- ```[n]>> file``` Appending Redirected Output

## How to use

The current version of minishell is developed and tested on macOS, but it should work on all UNIX/LINUX based systems as well.

Requirements:

- GCC / CLANG Compiler

- GNU Make

- GNU Readline library

```

git clone https://github.com/Ekkoz897/42cursus_Minishell minishell

```

```

cd minishell && make

```

```

./minishell

```