Minishell

Description

A miniature clone of bash.

About

• minishell can run executables from an absolute /bin/cat, relative ../../../../../bin/cat, or environment PATH cat with arguments.
• Environment variables are also handled including the exit status $?.
• You can use redirections > >> < << and pipes |.
• Builtins: cd, pwd, echo, export, unset, env, exit.
• Single and double quotes work just like in bash.
• Three signals are also handled just like in bash:
• Ctrl-C displays a new prompt on a new line.
• Ctrl-\ does nothing.
• Ctrl-D exits the shell.

Functionality

• Main calls ft_env to store the environment variables into key and value pair array.
• Main has an eternal loop reading the input from the user and passing it to minishell.
• Minishell parses the arguments into nodes that will be executed by the ft_executor.
• Ft_executer forks and each node is executed in the child process.
• Parent process returns to the main and the loop continues.

flowchart TD
    A --- |Copies the env| B[ft_copyenv]
    A[Main] --- |Passes the env to minishell| C[minishell]
    C --- |parse_args returns nodes| D[parse_args]
    D --- |Seperates the string inputted by the user to tokens|E[ft_cmd_trim]
    D --- |Expands environment variables|F[ft_expand]
    D --- |Splits the tokens if there are operators attached together|G[ft_split_operators]
    D --- |Trims any unnecessary quotes|H[ft_str_trim]
    D --- |Recursively assigns all necessary variables to each node|I[new_node]
    C --- |Nodes are passed to ft_executor| J[ft_executor]

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Usage

# Clone this project
$ git clone https://github.com/Stte/minishell

# Access
$ cd minishell

# Compile the program
$ make

# Run the project
$ ./minishell

Authors

• @DeRuina
• @Stte