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====== Linux Commands ======

This namespace contains documentation for the most commonly used Linux commands. Navigate the sections below to explore different categories of commands.

===== Navigation Commands =====

* **pwd**: Displays the current working directory.
    - Example: `pwd`
  
  * **cd**: Changes the current directory.
    - Example: `cd /home/user/`
  
  * **ls**: Lists files and directories.
    - Example: `ls -l` (detailed view)
    - Example: `ls -a` (includes hidden files)
  
  * **tree**: Displays the directory structure as a tree.
    - Example: `tree /home/user/`

===== File Manipulation Commands =====

* **cp**: Copies files or directories.
    - Example: `cp file.txt /path/to/destination/`
  
  * **mv**: Moves or renames files and directories.
    - Example: `mv file.txt new_file.txt`
  
  * **rm**: Removes files or directories.
    - Example: `rm file.txt`
    - For directories: `rm -r directory/`
  
  * **touch**: Creates empty files or updates the access time.
    - Example: `touch new_file.txt`
  
  * **cat**: Displays the content of a file.
    - Example: `cat file.txt`
  
  * **more**: Displays file content one page at a time.
    - Example: `more file.txt`
  
  * **less**: Similar to more, but allows more flexible navigation.
    - Example: `less file.txt`
  
  * **head**: Displays the first few lines of a file.
    - Example: `head file.txt`
  
  * **tail**: Displays the last few lines of a file.
    - Example: `tail file.txt`
  
  * **chmod**: Changes file or directory permissions.
    - Example: `chmod 755 file.txt`
  
  * **chown**: Changes the ownership of a file or directory.
    - Example: `chown user:group file.txt`
  
===== System Management Commands =====

* **ps**: Displays running processes.
    - Example: `ps aux`
  
  * **top**: Displays running processes in real-time.
  
  * **kill**: Terminates a process.
    - Example: `kill 1234` (where 1234 is the PID of the process)
  
  * **df**: Displays disk space usage.
    - Example: `df -h` (with human-readable units)
  
  * **du**: Displays disk usage of files and directories.
    - Example: `du -sh /directory`
  
  * **free**: Displays free and used memory.
    - Example: `free -h`
  
  * **uptime**: Displays how long the system has been running.
  
  * **reboot**: Reboots the system.
  
  * **shutdown**: Shuts down the system.
    - Example: `shutdown -h now`

===== Network Commands =====

* **ping**: Checks connectivity to another host.
    - Example: `ping google.com`
  
  * **ifconfig**: Displays network interfaces and their configuration.
    - Example: `ifconfig`
  
  * **ip**: Configures and displays network interfaces.
    - Example: `ip a`
  
  * **netstat**: Displays network connections and statistics.
    - Example: `netstat -tuln`
  
  * **wget**: Downloads files from the web.
    - Example: `wget http://example.com/file.zip`
  
  * **curl**: Makes HTTP requests.
    - Example: `curl http://example.com`

===== Compression Commands =====

* **tar**: Archives and extracts files.
    - Example to compress: `tar -czvf archive.tar.gz /directory/`
    - Example to extract: `tar -xzvf archive.tar.gz`
  
  * **zip**: Compresses files.
    - Example: `zip archive.zip file1.txt file2.txt`
  
  * **unzip**: Extracts zip files.
    - Example: `unzip archive.zip`
  
  * **gzip**: Compresses files into .gz format.
    - Example: `gzip file.txt`
  
  * **gunzip**: Extracts .gz files.
    - Example: `gunzip file.txt.gz`

===== User Commands =====

* **useradd**: Creates a new user.
    - Example: `useradd new_user`
  
  * **usermod**: Modifies user properties.
    - Example: `usermod -aG sudo user`
  
  * **passwd**: Changes a user's password.
    - Example: `passwd user`
  
  * **whoami**: Displays the current user name.
  
  * **id**: Displays user and group information.
  
  * **groups**: Displays the groups a user belongs to.
    - Example: `groups user`

===== Search Commands =====

* **find**: Searches for files and directories.
    - Example: `find /path -name "*.txt"`
  
  * **locate**: Locates files quickly using a database.
    - Example: `locate file.txt`
  
  * **grep**: Searches for text within files.
    - Example: `grep "text" file.txt`

===== Other Useful Commands =====

* **man**: Displays the manual page for a command.
    - Example: `man ls`
  
  * **history**: Displays the command history.
  
  * **alias**: Creates an alias for a command.
    - Example: `alias ll='ls -l'`
  
  * **clear**: Clears the terminal screen.

==== Sources ====
- [Linux Documentation](https://www.kernel.org/doc/)
- [Man Pages](https://man7.org/linux/man-pages/)

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