Linux Tutorials and Command Line Guides
Learn Linux with step-by-step tutorials, command line examples, and system administration guides for Ubuntu, RHEL, CentOS, and more.
Welcome to the Linux tutorials section, your complete resource for mastering Linux commands and system administration.
This category covers everything from basic commands to advanced system-level operations across multiple distributions such as Ubuntu, RHEL, and CentOS.
Linux is the backbone of modern infrastructure, and understanding it is essential for DevOps, cloud computing, and system administration. You may also explore System Administration and Security for advanced topics.
What you will learn
- Essential Linux commands and tools
- File system and process management
- User and permission management
- Real-world troubleshooting techniques
Ideal for
- Beginners learning Linux
- System administrators
- DevOps engineers
332 articles
Featured guides in this category
Hand-picked, most-cited tutorials — start here if you're new.
How do I install the Linux library libc.so.6
In this tutorial we learn how do I install the linux library libc.so.6. There are 3 possible scenarios: …
How to check the lock status of any user account in Linux
In this article I will share different methods to check the lock status of a user in Linux or Unix …
![How to install Anydesk on AlmaLinux 8 [Step-by-Step]](/install-anydesk-on-almalinux-8/install_anydesk_hu_1f4ec917374ba52d.webp)
How to install Anydesk on AlmaLinux 8 [Step-by-Step]
Step by step instructions to install anydesk on almalinux 8 with screenshot and examples
Downgrade Ubuntu to previous version?
Step by Step instructions to download Ubuntu to previous release
How to implement password policy in RHEL Linux with examples
Learn to implement password policy with complexity, old password reuse and more using pwquality.conf explained with examples in RHEL/CentOS 7 Linux
How to prevent user from using old password (or re-using) again in Linux
How to prevent user from using old password or reusing old password while providing new password in CentOS/RHEL 7 Password has been already used. Choose another …
How to check and set Java timezone (update tzdata for openJDK) using tzupdater
Steps to set java timezone using tzupdater update tzdata for openjdk in CentOS RHEL SLES. Check current tzdayta version in JRE java -jar tzupdater.jar -V
How to install EPEL repo in RHEL 8 Linux
Steps to install EPEL repo in RHEL 8 or CentsOS 8. How to Fix "Failed to synchronize cache for repo 'epel', ignoring this repo" error in EPEL
3 easy steps to configure hugepages in RHEL/CentOS 7/8
Step-by-Step Tutorial to configure hugepages in red hat and centos 7/8 linux using vm nr_hugepages in /etc/sysctl.conf. Also configure hugepages pool using …
How to check Transparent HugePages in Linux
Learn how to check Transparent HugePages in Linux, verify if THP is enabled or disabled, understand AnonHugePages vs static hugepages, and find per-process THP …
Check if CPU supports HugePages & change default hugepage size in RHEL
Learn how to check if CPU supports HugePages with 2MB and 1GB Size in CentOS/RHEl 7 Linux and change default hugepage size permanently using GRUB2 with examples …
How to generate sosreport in rescue mode on Software RAID (RHEL/CentOS 7)
How to generate sosreport in rescue mode linux. Fix sosreport command not found. Boot using RHEL/CentOS DVD to rescue mode in linux with software raid linux
How to suppress sysctl: reading key net.ipv6.conf.all.stable_secret in Linux
Steps to suppress sysctl: reading key "net.ipv6.conf.all.stable_secret" message while running sysctl -a to grep a value from STDOUT with example in Linux
How to set up proxy for yum repository in Linux?
I will share examples to set up proxy for yum repository in Linux. Modify yum.conf or /etc/yum.repos.d to set proxy for yum repositories.
Set up proxy using http_proxy & https_proxy environment variable in Linux?
How to set up proxy on Linux using http_proxy and https_proxy environment variable. Export the variables or set using /etc/environment and /etc/profile.d script …
Unregister RHEL 7 using Subscription Manager and Remove System Profile
Unregister RHEL 7 from Red Hat Network using subscription manager and remove system profile. subscription-manager unregister, clean to remove subscription data
Register RHEL 7 host to RHN using subscription manager (with or without proxy)
Register RHEL 7 system to Red Hat Satellite Network using subscription manager. Attach pool, enable and disable repositories with or without proxy in RHSM.conf
Fix 'there are no enabled repos' & create local repository in RHEL 7 & 8;
Create local repository using yum and dnf in RHEL 7 and 8 Fix there are no enabled repos Perform yum install without subscription. Create Offline yum repo Linux …
Secure Master Slave DNS Server with DNSSEC key in Linux (RHEL/CentOS 7)
Steps to secure master slave dns server using various algorithm types to secure the data replication between master and slave dns server using dnssec key Linux