Eshell - A Simple UNIX Command Line Interpreter

Eshell is a basic UNIX shell implemented in C. It provides a prompt where users can enter commands, and the shell will execute them just like traditional shells (e.g., sh, bash).

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Features

• Custom shell prompt: (Eshell) $
• Tokenizes and parses user input.
• Locates and executes system commands from the $PATH.
• Handles basic command execution using fork(), execve(), and waitpid().
• Gracefully handles command not found errors.
• Clean memory management.

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Files

File	Description
main.c	Main shell loop: reads input, parses it, and runs commands.
execmd.c	Handles forking and executing user commands.
get_location.c	Finds the full path of commands based on the $PATH.
main.h	Header file containing function prototypes and includes.

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How It Works

1. The shell prints a prompt: (Eshell) $
2. It waits for the user to type a command.
3. The input is tokenized into the command and its arguments.
4. The shell locates the executable using the PATH environment variable.
5. A child process is forked to execute the command using execve().
6. The parent shell waits for the child to finish before accepting the next command.

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Compilation

Use gcc to compile all the source files:

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