This is a custom shell program, designed to function similarly to popular Unix shells like Bourne Shell (bash). It parses user input and creates forked child processes to execute commands.

Key Features:

• Process creation and management using fork()
• Support for basic shell commands (ls, cd, rmdir, mkdir, rm, touch, cp, history, exit, quit)
• Command history with recall (up to 15 commands), including PID tracking.
• Continuous command execution until the user exits

Getting Started

Prerequisites

• GCC (GNU Compiler Collection)
• Unix-like operating system

Building

make

Running

To start the shell, run the compiled binary:

./msh

Usage

Once the shell is running, you can enter commands as you would in a regular Unix shell. Here are some examples:

history            # List command history
history -p         # List command history PIDs
!n                 # Re-run the nth most recent command
exit/quit          # Exit the shell

//Run any regular unix command
ls -l              # List files in the current directory
cd /path/to/dir    # Change directory
mkdir mydir        # Create a directory
rm myfile.txt      # Remove a file