⚙️ minishell (a 42 project) ⚙️

Subject: en.subject.pdf

✅ Grade

📄 Introduction

This project consists in reproducing the behaviour of bash. We had to make a mini bash. It had to be coded in C language, with a makefile compiling all the files together. For this project, we had to work in team with another student. Special thanks to Nico who has been the perfect teammate for it! It taught us how to work together on the same github repository and on the same project. Each of us made his part to complete the other's part.

This project was done during 42 cursus at 42 Perpignan in January of 2024 with bonus.

📒 Rules

📋 General rules

The minishell should:

• Display a prompt when waiting for a new command.
• Have a working history.
• Search and launch the right executable (based on the PATH variable or using a relative or an absolute path).
• Avoid using more than one global variable to indicate a received signal.
• Not interpret unclosed quotes or special characters which are not required by the subject such as \ (backslash) or ; (semicolon).
• Handle ’ (single quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence.
• Handle " (double quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence except for $ (dollar sign).
• Implement redirections : < should redirect input; > should redirect output; << should be given a delimiter, then read the input until a line containing the delimiter is seen; >> should redirect output in append mode.
• Implement pipes (| character). The output of each command in the pipeline is connected to the input of the next command via a pipe.
• Handle environment variables ($ followed by a sequence of characters) which should expand to their values.
• Handle $? which should expand to the exit status of the most recently executed foreground pipeline.
• Handle ctrl-C: it displays a new prompt on a new line.
• Handle ctrl-D: it exits the shell.
• Handle ctrl-\: it should do nothing.

🔩 Builtins

Your shell must implement the following builtins:

• echo with option -n.
• cd with only a relative or absolute path.
• pwd with no options.
• export with no options.
• unset with no options.
• env with no options or arguments.
• exit with no options.

⭐ Bonus

The minishell program has to implement:

• && and || with parenthesis for priorities.
• *Wildcards * should work for the current working directory.
  
  

💻 Usage

Clone the repository and make the binary:

git clone https://github.com/Arawyn42/42_minishell

cd 42_minishell && make

Launch the program:

./minishell

You can also use the -c flag, like in bash, to execute only one command line into the minishell, like this:

./minishell -c "..."

Some features have been implemented even if the subject didn't ask for it. For exemple, the backslash \ works in several cases, unclosed quotes open a kind of here_doc, like in bash, exit's builtin works with arguments, like the bash's exit...