Terminal Command Interpreter

This Java program implements a simple terminal command interpreter. It provides a set of basic commands similar to those found in a Unix-like shell. Users can interact with the program by entering commands, and the program will execute the corresponding actions.

Features

• Basic Commands: Supports basic file and directory manipulation commands such as pwd, ls, cd, cat, echo, mkdir, rmdir, rm, touch, cp, cp_r, wc, and history.
• Command History: Keeps track of the command history, allowing users to view previously executed commands.
• Redirection: Supports output redirection using > and >> operators.

Usage

1. Compile: Compile the Java program using a Java compiler (e.g., javac Terminal.java).

2. Run: Execute the compiled program (e.g., java Terminal).

3. Enter Commands: Enter commands at the prompt, and the program will execute the corresponding actions.

4. Exit: To exit the program, enter the command exit.

Commands

• pwd: Print the current working directory.
• ls [-r]: List files and directories in the current directory. The optional -r flag reverses the order.
• cd [directory]: Change the current working directory. If no directory is provided, it goes to the home directory.
• cat [file1] [file2] ...: Concatenate and display the content of one or more files.
• echo [text] [> or >> file]: Display text or redirect it to a file. Use > to overwrite or >> to append.
• mkdir [directory1] [directory2] ...: Create one or more directories.
• rmdir [directory]: Remove an empty directory.
• rm [file]: Remove a file.
• touch [file]: Create an empty file.
• cp [source] [destination]: Copy a file or directory to another location.
• cp_r [source] [destination]: Recursively copy a directory and its contents to another location.
• wc [file]: Count the number of lines, words, and characters in a file.
• history: Display the command history.

Redirection

• Use > to redirect output to a file, overwriting its content.
• Use >> to redirect output to a file, appending to its content.

Notes

• The program supports both absolute and relative paths.
• The program handles exceptions such as invalid commands, file not found, and other relevant errors.

Example Usage

$ java Terminal
/home/user: ls
file1.txt file2.txt
/home/user: cat file1.txt
Contents of file1.txt
...
/home/user: echo "Hello, World!" > output.txt
/home/user: cat output.txt
Hello, World!
/home/user: exit

Feel free to explore and experiment with the provided commands.