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Linux Administration Guide
Last updated: May 4, 2026
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User Management
- How to Change the Default Home Directory of a User
- How to Give Sudo Privileges to a User in Linux
- Checking a User’s Sudo Access
- List All Superusers in Linux
- How to Disable User Logins on Linux
- Disabling Guest Sessions in Linux
- How to Set a Non-expiring Password on Linux
- Adding User and Password Using Ansible
- Fix for ‘Username Is Not in the Sudoers File. This Incident Will Be Reported’
- How to Check for User Group Privileges
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Package Management
- List Installed Packages in Linux
- How to Check Whether a Package Is Installed Through a Package Manager
- Checking a Library Version in Linux
- Listing the Contents of an RPM Package Without Using the Package File
- Properly Remove an RPM Package
- Checking RPM Dependencies From the Command Line
- How to Install a Specific Version of a Package Using DNF
- Resolving Unmet Dependencies on Linux
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Kernel
- Obtain Kernel Config from Currently Running Linux System
- How to Update the Kernel to the Latest Version
- Getting the Kernel Command-Line Parameters
- Enabling User Namespaces in the Linux Kernel
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Security
- Managing Password Complexity in Linux
- Why Is the sudo Password Different From su root Password?
- Copying SSH Keys To Another Machine
- How to Add Public Key to known_hosts File
- How to Allow Only SSH Access Using iptables
- SSH Tunneling and Proxying
- Encrypting and Decrypting Directory in Linux
- Verifying if a Disk Is Encrypted in Linux
- How to Add, Remove, and Update CA Certificates in Linux
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Boot Process
- Guide to the Boot Process of a Linux System
- How to Improve Boot Speed of Linux
- Differences Between vmlinux, vmlinuz, vmlinux.bin, zimage, and bzimage
- Getting the Kernel Command-Line Parameters
- Adding Other Operating Systems to the GRUB Bootloader
- How to Set Default Entry for the Grub Menu
- How to Remove the Timeout From GRUB Menu
- Kernel Module Loading at Boot and modprobe Automation
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Monitoring
- The Logging Mechanism in Linux
- How to Monitor All Login Attempts in Linux
- Log the Memory Consumption on Linux
- Monitoring Network Usage in Linux
- Monitor Internet Bandwidth Usage on Linux
- How to Monitor Disk IO in a Linux System
- Monitoring Linux File Access With auditd
- Monitor Device Events in Linux
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File systems
- How to Automount Partitions at Linux Startup
- How to Resize and Move Partitions in Linux
- Mount Permissions and Remounting a Filesystem as Writable
- Mount Device With Specific User Rights
- How to Increase Swap Space in Linux
- Swap Partition vs Swap File
- Understanding Bind Mounts
- How to Transfer a File From Windows to Linux
- How to Resize VirtualBox Virtual Hard Disk
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General Configuration
- Configuration Files in Linux
- Difference Between .bashrc, .bash-profile, and .profile
- Colorizing Terminal and Shell in Linux
- How to Set the Core Dump File Path
- Huge Page Settings and Disabling Huge Pages in Linux
- Limits on the Number of Linux File Descriptors
- Change Keyboard Layout in the Linux Console
- How to Change the Timezone on Linux
- Changing Monitor Brightness on Linux
- Linux Display Managers (LightDM, SLiM, XDM, GDM, SDDM, KDM, Ly): Install and Uninstall Guide
- The /etc/resolv.conf File
- Manual Network Configuration in Linux and How to Set a Static IP Address
- Rotating Logs With Logrotate in Linux
- Run a Script on Startup in Linux
- Adding a Path to the Linux PATH Variable
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System and Service Management
- Creating User’s Services With systemd
- The Difference Between Systemctl and Service Command in Linux
- Enabling or Disabling Services in Linux
- How to List All Linux Services Starting at Boot
- Start Systemd Service After Specific Service
- Passing Multiple Parameters to a systemd Service
- How to Unmask systemd Services
- How to Clear systemd Journal Logs
- How to Clean Up a Linux System
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Hardware Management
- Find Out System Hardware Info From the Linux Command Line
- Get the Number of Processors/Cores in Linux
- How to View CPU Speed on Linux
- Controlling Fan Speed in Linux
- How to List All Physically Installed Network Cards in Linux
- How to Check the Health of SSD in Linux
- How to Find the Drivers Associated With a Device on Linux
- Linux Power-Saving Tools
- How to Check Whether a USB Device Is Present on a Linux Machine
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