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Java Shell Implementation

A lightweight shell implementation in Java that supports basic Unix-like commands. This shell provides a minimal command-line interface with support for common shell operations.

Features

  • Basic command prompt interface ($)

  • Built-in commands:

    • pwd - Print working directory
    • cd - Change directory (supports absolute paths and ~ for home directory)
    • echo - Print text to console (supports both quoted and unquoted strings)
    • type - Display information about command type
    • exit - Exit the shell

  • External command execution through PATH lookup

  • Path normalization and validation

  • Home directory resolution (~)

Requirements

  • Java 11 or higher
  • java.nio.file support
  • Operating system with PATH environment variable

Installation

  1. Clone this repository:
git clone https://github.com/yourusername/java-shell.git
  1. Compile the Java file:
javac Main.java
  1. Run the shell:
java Main

Usage

The shell provides a command prompt ($) where you can enter commands:

$ pwd
/current/working/directory
$ echo "Hello World"
Hello World
$ cd ~
$ type echo
echo is a shell builtin

Supported Commands

  1. pwd

    • Displays the current working directory

  2. cd [directory]

    • Changes the current working directory
    • Supports absolute paths and ~ for home directory
    • Example: cd ~/Documents or cd /usr/local

  3. echo [text]

    • Prints text to the console
    • Supports both quoted and unquoted strings
    • Example: echo Hello World or echo "Hello World"

  4. type [command]

    • Displays whether a command is a shell builtin or its location in PATH
    • Example: type pwd or type java

  5. exit 0

    • Exits the shell

Implementation Details

  • Uses Java NIO for file operations
  • Implements PATH lookup for external commands
  • Handles both built-in commands and external executables
  • Supports basic string parsing for command arguments
  • Implements working directory management

Limitations

  • Basic command parsing (no advanced shell features)
  • Limited support for command arguments and flags
  • No pipeline support
  • No environment variable expansion
  • No wildcard support
  • No command history

Contributing

Feel free to submit issues and enhancement requests!