thesimplezero / simple_shell

Simple Shell Implementation In C

Simple Shell

This is a simple UNIX command interpreter written in C language. The program provides a command line user interface for UNIX-like operating systems.

Features

• Implements most of the basic functions of a command-line interpreter.
• Reads commands from standard input and executes them.
• Provides built-in functions like cd and exit.
• Handles command separators (;).
• Handles logical operators (&&, ||).
• Custom getline implementation.
• Resolves commands to their paths before execution.
• Basic signal handling.
• Uses a custom strtok function.
• Handles command execution in child processes.

Getting Started

Prerequisites

You need to have a UNIX-like operating system with a gcc compiler installed to compile and run this program.

Compilation

Compile the program by using gcc: bash gcc -Wall -Werror -Wextra -pedantic *.c -o hsh

Running

After compilation, you can run the program with: ` bash

./hsh

`

You should see a prompt where you can type commands

Files

main.h - This is the main header file containing all the function prototypes of the shell.

processes.h - This is the header file containing the prototypes of functions dealing with process creation and management.

*.c - These are the source files containing all the functions used by the shell.

Functions

The shell implements various functions, including:

• print_prompt(): Displays the shell prompt.
• custom_getline(): Reads an entire line from the stream.
• sigint_handler(): Handles SIGINT signals.
• command_parser(): Parses a string into tokens using a delimiter.
• get_path(), set_path(), add_to_path(): Handle the PATH environment variable.
• custom_strtok(), custom_strdup(), custom_sprintf(), custom_strncpy(): Custom string manipulation functions.
• builtin_env(), handle_exit(), handle_cd(): Handle built-in commands.
• handle_command_separator(), handle_logical_operators(): Handle command separators and logical operators.

In processes.h:

• create_process(): Creates a new process.
• execute_command(): Executes a command.
• resolve_path(): Resolves a command to its absolute path.
• wait_for_process(): Waits for a process to change its state.
• handle_signal(): Handles signals.
• terminate_process(): Terminates a process.

Authors