Simple Shell Project

This is a simple shell implementation in C.

Overview

This shell project provides a basic command-line interface with support for built-in commands, external commands, and environmental variable management.

Features

• Built-in commands: exit, cd, env, setenv, unsetenv
• Execution of external commands
• Environmental variable management
• Input/output redirection (to be implemented)
• Pipelines (to be implemented)

Usage

1. Compilation: To compile the shell project, use the following command:

   gcc -o shell *.c -Wall -Werror -pedantic -std=gnu89
   

This command compiles all the source files into an executable named shell.

Run the Shell:

bash Copy code ./shell Supported Commands:

exit: Exit the shell.
cd [directory]: Change the current directory.
env: Display environment variables.
setenv [variable] [value] [overwrite]: Set an environment variable.
unsetenv [variable]: Unset an environment variable.

Example Usage:

$ ./shell

Simple Shell$ ls
file1.txt file2.txt
Simple Shell$ cd ..
Simple Shell$ env
PATH=/usr/bin:/bin
HOME=/home/user
Simple Shell$ exit

Main Function:

#include "shell.h"

int main(void)
{
    char *command = NULL;
    char **tokenized_command = NULL;
    size_t line = 0;
    int return_status = 0;

    while (1)
    {
        _puts("$ ");
        getline(&command, &line, stdin);

        // Append the command to history file
        append_text_to_file("history.txt", command);

        // Remove the newline character
        command[_strcspn(command, '\n')] = '\0';

        // Clean up the command
        command = clean(command);

        // Tokenize the command
        tokenized_command = strtoarr(command, ' ');

        // Look for the command in the system's PATH
        command = look_in_path(tokenized_command[0]);

        // Execute the command
        return_status = exe(command, tokenized_command);
    }

    // Free dynamically allocated memory before exiting
    free(command);
    free(tokenized_command);

    return return_status;
}

Contributing

Feel free to contribute to this project by providing bug reports, suggestions, or additional features.

License

This project is licensed under the MIT License - see the LICENSE file for details.