LINUX_File_Management_System_Emulator

This program simulates a simple Linux file system with basic shell command functionalities. It provides a structure to manage files and directories, akin to a simplified Linux environment. Below, you'll find detailed descriptions of the functionalities and commands available in this simulation.

Table of Contents

• Overview:
• Class Descriptions:
• Functions:
• Commands:
• Usage:
• Compilation and Execution:

Overview

The program is designed to simulate a file system using a tree structure, where each node represents either a file or a directory. It supports various commands such as ls, cd, pwd, mkdir, touch, rm, cp, mv, chmod, find, stat, edit, cat, and more, mimicking a Linux shell.

Class Descriptions

TreeNode The TreeNode class represents a node in the file system, which can either be a file or a directory.

• Attributes:
  • name: The name of the file or directory.
  • contents: The contents of the file (used for files only).
  • type: The type of node ('d' for directory, '-' for file).
  • cdate: Creation date of the node.
  • mdate: Last modified date of the node.
  • permission: Permission of the node in numeric form.
  • parent: Pointer to the parent node.
  • link: Pointer to the next sibling node.
  • child: Pointer to the first child node.
• Methods:
  • get_permission(): Returns the permission in string format (e.g., "rwx").

Functions

Main Functions

• linux_tree(TreeNode root):* Initializes the file system with some default directories and files.
• print_help(): Prints the help message with a list of available commands.
• print_tree(TreeNode root, string prev):* Recursively prints the contents of the directory in a tree-like format.
• print_ls(TreeNode pwd):* Lists the contents of the current directory.
• print_stat(TreeNode root, TreeNode pwd, string path):** Prints metadata of a file or directory.
• pwd_str(TreeNode root, TreeNode pwd):** Returns the current working directory as a string.
• find_names(TreeNode root, TreeNode pwd, string name):** Finds files or directories by name.
• find_node(TreeNode root, TreeNode pwd, string path):** Finds a node by its path.
• find_on_pwd(TreeNode pwd, string name):* Finds a node in the current working directory by name.
• split(string str, char delim): Splits a string by a delimiter.
• join(list str, char delim): Joins a list of strings by a delimiter.
• split_name(string str): Splits a path into directory and name.
• cd(TreeNode root, TreeNode pwd, string path):** Changes the current directory.
• create(TreeNode root, TreeNode pwd, string path, char type):** Creates a new file or directory.
• remove(TreeNode root, TreeNode pwd, string path):** Removes a file or directory.
• dupl(TreeNode root, TreeNode pwd, string src, string dst, int keep):** Copies or moves a file or directory.
• edit(TreeNode root, TreeNode pwd, string path):** Edits the contents of a file.
• cat(TreeNode root, TreeNode pwd, string path):** Prints the contents of a file.
• chmod(TreeNode root, TreeNode pwd, string path, string new_modes):** Changes the permissions of a file or directory.
• clear_screen(): Clears the console screen.

Commands

The following commands are supported by the simulated file system:

• help: Prints the help message with a list of available commands.
• ls: Lists contents of the current directory.
• tree: Lists contents of the current directory in a tree-like format.
• pwd: Prints the current working directory.
• cd DIR: Changes directory to DIR.
• find N: Finds file or directory named N.
• stat P: Prints metadata of file or directory at path P.
• mkdir D: Creates a directory named D.
• touch F: Creates a file named F.
• rm P: Removes the file or directory at path P.
• rmdir P: Removes the directory at path P.
• cp S D: Copies file or directory from S to D.
• mv S D: Moves file or directory from S to D.
• edit P: Edits the file at path P.
• cat P: Prints the contents of the file at path P.
• chmod M P: Changes permissions of the file at path P to mode M.
• clear: Clears the console screen.
• exit: Exits the shell.

Usage

• Listing Files and Directories:

  • ls lists the contents of the current directory.
  • tree displays the directory structure in a tree format.

• Navigating Directories:

  • pwd shows the current directory path.
  • cd DIR changes the current directory to DIR.

• Managing Files and Directories:

  • mkdir D creates a new directory named D.
  • touch F creates a new file named F.
  • rm P or rmdir P removes a file or directory at path P.

• File Operations:

  • cp S D copies a file or directory from S to D.
  • mv S D moves a file or directory from S to D.
  • edit P edits the contents of the file at path P.
  • cat P prints the contents of the file at path P.

• File and Directory Information:

  • stat P prints the metadata of a file or directory at path P.
  • find N searches for a file or directory named N.

• Permission Management:

  • chmod M P changes the permissions of the file at path P to mode M.

• Miscellaneous:

  • clear clears the console screen.
  • exit exits the shell.

Compilation and Execution:

To compile and run the program, follow these steps:

• Compile the program:

  • g++ -o fs_simulator fs_simulator.cpp

• Run the program:

  • ./fs_simulator