Linux-Essentials

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Linux-Essentials

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Covering fundamental Linux concepts, from basic commands to advanced topics like string processing, file management, user and group management, networking, process control, firewall configuration, task scheduling, and more.

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<h1 align="center">🐧 Linux Essentials</h1>

Collection of Linux fundamental concepts, commands, and configurations. Designed as a learning resource for beginners, it covers everything from basic commands to advanced topics such as string processing, file management, user and group management, networking, process control, firewall configuration, task scheduling, and more.

## 📌 Introduction to Linux
- 📜 [UNIX, Linux, and Open Source](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Readme.md#what-is-unix)
- 🖥️ [What is Linux?](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Readme.md#what-is-linux)
- 📅 [History and Evolution of Linux](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Readme.md#history-and-evolution-of-linux)
- ⚙️ [Understanding the Linux Kernel](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Readme.md#what-is-the-linux-kernel)
- 🔑 [Key Features of Linux](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Readme.md#linux-features)
- 📦 [Linux Distributions](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Readme.md#linux-distributions)
- 📂 [Directory Structure of Linux](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Directory-Structure-of-Linux.md#linux-directory-structure)
- 💾 [Linux Installation](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Centos-9-Installation.md)
- 🔐 [Login Methods in Linux](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Login-Methods-in-Linux.md#linux-login-methods)
- 🔄 [Run Levels in Linux](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Introduction-to-Linux/Run-Level.md#runlevels-in-linux)

## 🏗️ Linux Basic Commands
- 🗺️ [Finding Your Way (`ls`, `pwd`, `cd`)](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Readme.md#file-and-directory-management)
- 📁 [Creating and Removing Directories and Files (`mkdir`, `touch`, `rmdir`, `rm`)](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Create-and-Remove-File-and-Directory.md)
- 🔄 [Copying, Moving, and Renaming Files and Directories](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Copy-Move-Command.md)
- 📜 [Using the `cat` Command](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Text-Editors/cat.md)
- 📖 [Using the `less` and `more` Commands](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Viewing-Files.md)
- ➡️ [Pipes and Redirects](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Redirection-in-Linux.md#redirection-operators)
- 🗜️ [Archiving and Compression](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Compress-Tool.md)
  - [`zip`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Compress-Tool.md#zip)
  - [`gzip`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/gzip.md)
  - [`bzip`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/bzip2.md)
  - [`tar`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/tar.md)
  - [`7zip`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/7z.md)
- 🔗 [Symbolic Links](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Symbolic-Link.md)
- ⚡ [Shortcuts](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Linux-Basic-Commands/Linux-Shortcuts.md)

## ✍️ Text Editors
- 📝 [`cat`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Text-Editors/cat.md)
- 🖊️ [`nano`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Text-Editors/nano.md)
- 🎨 [`vi` / `vim`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Text-Editors/vim.md)

## 🔍 String Processing and Finding Files

- 🔝 [`head`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/head.md)
- 🔚 [`tail`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/tail.md)
- 🔢 [`wc`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/wc.md)
- 📑 [`sort`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/sort.md)
- ✂️ [`cut`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/cut.md)
- 🔗 [`paste`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/paste.md)
- 🔍 [`grep`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/grep.md)
- 📊 [`awk`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/awk.md)
- 🛠️ [`sed`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/sed.md)
- 🛠️ [`tr`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/String-Processing/tr.md)

### 🔎 Finding Files Commands:
- 🌳 [`tree`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Finding-Files/tree.md)
- 🔦 [`find`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Finding-Files/find.md)
- ❓ [`which`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Finding-Files/which.md)
- 📌 [`whereis`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Finding-Files/whereis.md)

## 👥 Users, Groups, and Permissions
- 🖥️ [Types of Shells](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Shell-Introduction.md)
- 🏢 [Users and Groups](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/User-and-Group.md)
- 📄 [`/etc/passwd` File](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/System-Files.md#etcpasswd--user-account-information)
- 🔐 [`/etc/shadow` File](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/System-Files.md#etcshadow--secure-password-storage)
- 📂 [`/etc/group` File](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/System-Files.md#etcgroup--group-information)
- 🔏 [`/etc/gshadow` File](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/System-Files.md#etcgshadow--secure-group-management)
- ➕ [Adding Users](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Useradd-Adduser.md)
- 🔄 [Modifying User Accounts](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Usermod.md)
- 🔄 [Manage User Password](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Passwd.md)
- ❌ [Deleting User Accounts](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Userdel.md)
- 👥 [Working with Groups](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Group-Management.md)
- 🛡️ [Root Login](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Root-Login.md#-how-to-enable-root-login-in-linux)
- 🔄 [Sharing Superuser Privileges with others (`su` and `sudo` Commands)](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/SU-SG.md)
- 🔀 [Sudo command](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Sudo-Command.md)
- 📂 [Files and Directory Permissions](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/File-and-Directory-Permission.md)
- 🔄 [Changing Permissions](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/File-and-Directory-Permission.md/#chmod-–-Changing-Files-and-Directories-Permissions)
- ⚙️ [Setting Default Permissions](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Default-Permissions.md)
- 🏷️ [SUID Bit](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Special-Permissions.md#setuid-suid)
- 🏷️ [SGID Bit](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Special-Permissions.md#setgid-sgid)
- 📌 [Setting the Sticky Bit](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/Special-Permissions.md#sticky-bit)
- 🔐 [ACL Permissions](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Users-Groups-and-Permissions/ACL.md#)

## 📦 Package Management
- 📂 [Overview of RPM, SRPM and DPKG](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/Readme.md)
- 🏗️ [Explanation of Different Architectures](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/Readme.md#Different-Architectures)
- 🛠️ [Installing Packages Using RPM](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/RPM.md)
- 🌐 [Understanding Repositories](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/Understanding-Repositories.md#-understanding-repositories-in-linux)
  - 🏪 [Types of Repositories](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/Understanding-Repositories.md#Types-of-Repositories)
- 📥 [Installing Packages Using `yum`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/YUM.md)
- 📥 [Installing Packages Using `dpkg`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/DPKG.md)
- 📥 [Installing Packages Using `apt`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Package-Management/APT.md)

## 💾 File System & Disk Management
- 💿 [Types of Disks](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Readme.md)
- 🛠️ [`parted` Utility](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Parted.md)
- 🛠️ [`fdisk` Utility](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Fdisk.md#what-is-fdisk)
- 📂 [Mounting a File System](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Mount.md)
- 📝 [The `/etc/fstab` File](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Fdisk.md#what-is-fdisk)
- 📊 [Quota Management](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Quotas-Managment.md)
- 🔄 [SWAP (Partitions and Files)](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Swap.md)
- 🏗️ [RAID Overview](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Raid-Overview.md)
  - ⚡ [Uses of RAID](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Raid-Overview.md#uses-of-raid)
  - 📊 [RAID Levels](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Raid-Overview.md#raid-levels)
- 🔍 [Logical Volume Manager (LVM)](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/File-System-and-Disk-Management/Logical-Volume-Manager.md)

## 🌐 Network Configuration and Controlling Services
- 🌍 [Network Configuration](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Readme.md)
  - [`hostname`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Hostname.md)
  - [`ip`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/IP.md)
  - [`ifconfig`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Ifconfig.md)
  - [`nmtui` and `nmcli`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Nmtui-and-Nmcli.md)
- 🛠️ Network Tools
  - 🔄 [`traceroute`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Traceroute.md)
  - 🔄 [`tracepath`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Tracepath.md)
  - 📡 [`netstat`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Netstat.md)
  - 📡 [`ss`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/SS.md)
  - 📡 [`ping`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Ping.md)
- 🌐 Network Clients
  - 🔐 [`ssh`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/SSH-and-SCP.md)
  - 📦 [`scp`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/SSH-and-SCP.md#SCP)
  - 📂 [`ftp`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/FTP.md)
  - 🌍 [`wget`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Wget.md)
- 🔄 [`rsync`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Rsync.md)
- 📌 [Checking the Status of Services](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Service-Managment.md#Checking-the-Status-of-a-Service)
  - ✅ [Is service active?](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Service-Managment.md#Checking-the-Status-of-a-Service#Checking-if-a-Service-is-Active-or-Enabled)
  - ✅ [Is service enabled?](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Service-Managment.md#Checking-the-Status-of-a-Service#Checking-if-a-Service-is-Active-or-Enabled)
  - 📜 [Listing the Active/Inactive State of Loaded Units](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Service-Managment.md#Listing-Services)
- 🔄 [Starting, Restarting, and Stopping Services](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Network-Configuration/Service-Managment.md#Starting-Restarting-and-Stopping-a-Service)

## 📊 Process Management, and Monitoring Tools

- 🔄 [`ps`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Process-Management/Readme.md#viewing-processes-with-ps-command)
- 🗺️ [`jobs`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Process-Management/Readme.md#viewing-and-managing-jobs)
- ➡️ [`fg`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Process-Management/Readme.md#running-commands-in-the-background--foreground)
- 🗜️ [`htop`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Process-Management/Readme.md#monitoring-processes-in-real-time) 
- ⚡ [`kill`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Memory-Management/Memory-Management.md#kill) 
 
### 🦠 Installing & Configuring Antivirus Software
- 🔬 [`ClamAV`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Antivirus-Softwares/ClamAV.md)
- 🛡️ [`LMD`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Antivirus-Softwares/ClamAV.md)

### 🏰 Firewalls
- 🚧 [`iptables`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Firewalls/Iptables.md)
- 🌐 [`firewalld`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Firewalls/Firewalld.md)
- 🔥 [`ufw`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Firewalls/UFW.md)
- 🚧 [`nft`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Firewalls/Nftable.md)

### 📊 Memory Management and System Performance Commands
- 📈 [`free`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Memory-Management/Readme.md#free)
- 📈 [`vmstat`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Memory-Management/Readme.md#vmstat)
- 📊 [`iostat`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Memory-Management/Readme.md#iostat)
- 🔎 [`lsof`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Memory-Management/Readme.md#losf)
- 🌐 [`kill`](https://github.com/InfoSecWarrior/Linux-Essentials/blob/main/Memory-Management/Readme.md#kill)

---
### 🤝 Contributing

Feel free to fork this repository and contribute to the guide by submitting pull requests.

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