Shell

A simple cross-platform shell implemented in C++.

Features

• Executes external commands.
• A suite of built-in commands for filesystem, text, and system information.
• Customizable prompt that displays the current working directory.
• Command history accessible via the history command.
• Color-coded and formatted output for commands like ls and pwd.
• A friendly welcome message on startup.

Built-in Commands

Filesystem

Command	Description	Usage
ls [path]	Lists the contents of a directory in a detailed format.	ls or ls src
pwd	Prints the current working directory.	pwd
cd [path]	Changes the current working directory.	cd src
mkdir [name]	Creates a new directory.	mkdir new_folder
rm [name]	Removes a file or an empty directory.	rm old_file.txt
touch [name]	Creates an empty file or updates its timestamp.	touch new_file.txt
cp [src] [dest]	Copies a file.	cp file.txt backup.txt
mv [src] [dest]	Moves or renames a file.	mv old_name.txt new_name.txt

Text Manipulation

Command	Description	Usage
cat [file]	Displays the content of a text file.	cat README.md
grep [pat] [file]	Searches for a pattern in a text file.	grep "CMake" README.md
head [file]	Displays the first 10 lines of a text file.	head README.md
head -n 15 [file]	Displays the first 15 lines of a text file.	head -n 15 README.md
tail [file]	Displays the last 10 lines of a text file.	tail README.md
tail -n 15 [file]	Displays the last 15 lines of a text file.	tail -n 15 README.md

System & Session

Command	Description	Usage
history	Displays the command history for the current session.	history
date	Displays the current date and time.	date
hostname	Displays the computer name.	hostname
echo [text]	Prints text to the console.	echo Hello, World!
exit	Exits the shell.	exit

Building the Project

This project uses CMake to generate build files.

Prerequisites

• A C++17 compliant compiler (e.g., GCC, Clang, MSVC)
• CMake (version 3.10 or later)

Build Steps

1. Clone the repository (if you haven't already):

   git clone <repository-url>
   cd Powershell

2. Create a build directory:

   mkdir build
   cd build

3. Configure the project with CMake:

   cmake ..

4. Build the project:

   • On Windows (with Visual Studio):

     cmake --build . --config Release

   • On Linux/macOS:

     make

The executable shell (or shell.exe on Windows) will be created in the build directory.

Running the Shell

Navigate to the build directory and run the executable:

./shell

Or on Windows:

.\\shell.exe