20 Linux Commands Every H@cker Must Know (in 27 minutes)

The video "20 Linux Commands Every H@cker Must Know (in 27 minutes)" by Ashish Kumar is a practical tutorial focused on essential Linux commands that are crucial for beginners and hackers alike. It covers both fundamental and slightly advanced commands, explaining their purpose, usage, and practical demonstrations on a Kali Linux machine.

Key Technological Concepts and Product Features Covered:

1. Basic Linux Navigation and File Management Commands:
   • ls: Lists files and directories. Variants like ls -la show detailed info including permissions, ownership, size, and modification date.
   • cd: Changes the current directory.
   • pwd: Prints the current working directory.
   • dir: Similar to ls but compatible with Windows CMD.
   • mkdir: Creates a new directory.
   • cp: Copies files or directories; with -r option to copy directories recursively.
   • mv: Moves (cut-paste) files or directories.
   • rm: Deletes files or directories; -r option used for recursive deletion of directories.
2. Understanding File and Directory Permissions:
   • Explanation of file permissions: read, write, and execute.
   • Using chmod to add (+x) or remove (-x) execute permissions or other permissions from files.
   • Importance of executable permission for running scripts or programs.
3. Using Terminal and GUI:
   • Comparison between graphical file management (GUI) and terminal commands.
   • Terminal as a powerful tool for file system navigation and manipulation.
4. Help and Manual Commands:
   • help and man commands to get detailed information about any Linux command.
   • man pages provide comprehensive manuals, often better formatted than help.
5. Root Privileges and sudo:
   • Using sudo to run commands with administrative privileges.
   • Using sudo -i (or sudo au as mentioned) to get a root shell for continuous admin access.
   • Difference in terminal prompt symbols ($ for normal user, # for root).
6. File Viewing and Editing:
   • cat command to display file contents.
   • Command-line file editor (likely nano) usage for creating and editing files.
   • gedit for graphical file editing.
7. Running Executable Files:
   • Running executable files with ./filename after granting execute permission.
   • Explanation of how executable permissions allow scripts or programs to run.

Practical Demonstrations and Tutorials:

• Navigating directories using cd and pwd.
• Listing directory contents with ls and dir.
• Creating, copying, moving, and deleting directories and files.
• Changing file permissions with chmod.
• Using sudo for administrative tasks.
• Creating and editing files via command line and GUI.
• Running executable scripts.

Summary of Commands Highlighted:

• ls, cd, pwd, dir
• mkdir
• cp -r
• mv
• rm -r
• chmod +x / -x
• sudo, sudo -i
• cat
• nano (command-line editor)
• gedit (graphical editor)
• ./filename (execute a file)
• help, man

Main Speaker:

• Ashish Kumar (presenter and instructor)

The video serves as a concise yet comprehensive beginner’s guide to essential Linux commands, especially useful for hackers or users aiming to understand Linux file systems, permissions, and command-line operations. It balances theory with practical examples on Kali Linux, emphasizing command usage, error handling, and administrative privileges.