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Linux Administration Guide
Last updated: February 7, 2025
User Management
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How to Change the Default Home Directory of a User
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How to Give Sudo Privileges to a User in Linux
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Checking a User's Sudo Access
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List All Superusers in Linux
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How to Disable User Logins on Linux
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Disabling Guest Sessions in Linux
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How to Set a Non-expiring Password on Linux
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Adding User and Password Using Ansible
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Fix for ‘Username Is Not in the Sudoers File. This Incident Will Be Reported'
(popular)
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How to Check for User Group Privileges
Package Management
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List Installed Packages in Linux
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How to Check Whether a Package Is Installed Through a Package Manager
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Checking a Library Version in Linux
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Listing the Contents of an RPM Package Without Using the Package File
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Properly Remove an RPM Package
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Checking RPM Dependencies From the Command Line
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How to Install a Specific Version of a Package Using DNF
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Resolving Unmet Dependencies on Linux
Kernel
Security
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Managing Password Complexity in Linux
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Why Is the <em>sudo</em> Password Different From <em>su root</em> Password?
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Copying SSH Keys To Another Machine
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How to Add Public Key to known_hosts File
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How to Allow Only SSH Access Using iptables
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SSH Tunneling and Proxying
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Encrypting and Decrypting Directory in Linux
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Verifying if a Disk Is Encrypted in Linux
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How to Add, Remove, and Update CA Certificates in Linux
(popular)
Boot Process
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Guide to the Boot Process of a Linux System
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How to Improve Boot Speed of Linux
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Differences Between vmlinux, vmlinuz, vmlinux.bin, zimage, and bzimage
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Getting the Kernel Command-Line Parameters
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Adding Other Operating Systems to the GRUB Bootloader
(popular)
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How to Set Default Entry for the Grub Menu
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How to Remove the Timeout From GRUB Menu
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Kernel Module Loading at Boot and modprobe Automation
Monitoring
File systems
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How to Automount Partitions at Linux Startup
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How to Resize and Move Partitions in Linux
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Mount Permissions and Remounting a Filesystem as Writable
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Mount Device With Specific User Rights
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How to Increase Swap Space in Linux
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Swap Partition vs Swap File
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Understanding Bind Mounts
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How to Transfer a File From Windows to Linux
(popular)
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How to Resize VirtualBox Virtual Hard Disk
General Configuration
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Configuration Files in Linux
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Difference Between .bashrc, .bash-profile, and .profile
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Colorizing Terminal and Shell in Linux
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How to Set the Core Dump File Path
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Huge Page Settings and Disabling Huge Pages in Linux
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Limits on the Number of Linux File Descriptors
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Change Keyboard Layout in the Linux Console
(popular)
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How to Change the Timezone on Linux
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Changing Monitor Brightness on Linux
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Linux Display Managers (LightDM, SLiM, XDM, GDM, SDDM, KDM, Ly): Install and Uninstall Guide
(popular)
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The /etc/resolv.conf File
(popular)
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Manual Network Configuration in Linux and How to Set a Static IP Address
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Rotating Logs With Logrotate in Linux
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Run a Script on Startup in Linux
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Adding a Path to the Linux PATH Variable
System and Service Management
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Creating User's Services With systemd
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The Difference Between Systemctl and Service Command in Linux
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Enabling or Disabling Services in Linux
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How to List All Linux Services Starting at Boot
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Start Systemd Service After Specific Service
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Passing Multiple Parameters to a systemd Service
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How to Unmask systemd Services
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How to Clear <em>systemd</em> Journal Logs
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How to Clean Up a Linux System
Hardware Management
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Find Out System Hardware Info From the Linux Command Line
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Get the Number of Processors/Cores in Linux
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How to View CPU Speed on Linux
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Controlling Fan Speed in Linux
(popular)
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How to List All Physically Installed Network Cards in Linux
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How to Check the Health of SSD in Linux
(popular)
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How to Find the Drivers Associated With a Device on Linux
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Linux Power-Saving Tools
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How to Check Whether a USB Device Is Present on a Linux Machine