Simple Command Line Interpreter

Overview

This project implements a basic Command-Line Interpreter (CLI) as part of the requirements for the Object-Oriented Programming course at the Faculty of Electrical Engineering, University of Belgrade. The interpreter supports a subset of commands found in common operating systems, allowing users to execute commands interactively or in batch mode.

Features

The CLI interpreter supports the following functionalities:

• Interactive Command Input: Users can enter commands interactively via the console.
• Batch Command Input: Commands can be loaded and executed from a text file.
• Redirection and Piping: Support for input and output redirection and command piping.
• Error Handling: Includes error handling for incorrect command syntax, unknown commands, and other execution-related errors.

Commands

The interpreter currently supports the following commands:

• echo [argument]: Outputs the text provided as an argument.
• prompt argument: Changes the command prompt symbol.
• time: Displays the current system time.
• date: Displays the current system date.
• touch argument: Creates an empty file.
• truncate argument: Clears the contents of a specified file.
• rm argument: Deletes a specified file.
• wc [option] [argument]: Counts words (-w) or characters (-c) in a text.
• tr [argument] what [with]: Replaces or removes specific characters in a text.
• head -ncount [argument]: Displays the first few lines of a text.
• batch [argument]: Executes a series of commands from a file.

Usage

todo

Examples

1. Echo Command:

   $ echo "Hello, World!"

   Output:

   Hello, World!

2. Word Count (wc) Command:

   $ wc -w "Lorem ipsum dolor sit amet"

   Output:

   5

3. Redirection:

   $ wc -w "Sample text" > output.txt

4. Piping:

   $ time | tr ":" "." | wc -c > time.txt

Error Handling

The interpreter provides feedback for incorrect commands or syntax errors. Some examples include:

todo