Linux Tutorials and Command Line Guides

Learn how to add a user to sudoers safely with visudo, sudoers.d drop-in files, command-specific rules, NOPASSWD examples, syntax checks, aliases, and tested sudo -l verification output.

Learn how to check Linux kernel version with tested uname, hostnamectl, procfs, journalctl, dmesg, boot image, dpkg, and apt commands, and understand the difference between the running kernel and installed kernel …

Tested Linux commands to check thread count per process using proc task directories, proc status, ps NLWP/LWP, ps -T, top -H and pstree, plus system thread limits.

Tested Linux commands to show hidden files with ls, list only hidden files, find hidden files recursively, and check hidden file or directory size with du.

Learn how to check Ubuntu version from the command line or GUI. Use lsb_release, /etc/os-release, hostnamectl, /etc/issue, or Settings to find your Ubuntu release, version number, codename, and kernel.

Learn how to list groups in Linux and check user group membership using commands like groups, id, getent, compgen, and /etc/group. This guide explains how to view all groups, list groups for a user, and display users …

Step by Step instructions to install yarn on Linux and WIndows. Installation on Ubuntu (Debian based) and Rocky Linux (Red hat based) and Windows.

Learn when and how to restart crontab in Linux. See cron restart and reload commands for Ubuntu, Debian, RHEL, CentOS—and when a restart is NOT required.

commands to copy file from one server to another in Linux or Unix with examples using sftp scp rsync sshfs nfs. copy using shell script between two machine

How to extract/unpack/uncompress the contents of the initramfs image on RHEL7 and RHEL8? How do I list initramfs image file content? How do I modify the contents of an initrd or initramfs? How do I view an initrd or …

In this article we learned how to properly perform a curl POST request with practical examples

There are two different versions of pip which you can install to solve the error i.e. pip command not found in Ubuntu 20.04 Linux. Step by Step instructions to fix pip command not found error.

To create custom ISO in RHEL/CentOS 8, create a kickstart file and modify the isolinux.cfg for boot menu. You can also minimze the package list and update repodata

This tutorial will guide you through step by step instructions to install ImageMagick on Ubuntu, covering various methods like APT and compiling from source. We'll also explore basic usage, including image conversion and …

Learn how to install XFCE on Ubuntu using multiple methods including minimal XFCE installation, full Xubuntu desktop setup, and GUI installation on Ubuntu Server. This guide also explains how to switch desktop …

Discover how to add user to group in Linux using various methods like usermod, gpasswd, and adduser. Efficiently manage permissions and access control with these essential techniques.

When managing files and directories in Linux operating systems, there may be a need to know how many files are in a given directory. For example:

If you have not integrated Linux servers into a central user authentication such as LDAP/Active Directory, you will have to create local users many times.

Step by step instructions to remove dot in Linux permission section for file and directory. What is the meaning of having dot (.) in the end of Linux permission field.

Step by step instructions to install plex media server on Debian 11 Bullseye

Step by Step tutorial to configure samba active directory domain controller in CentOS 8 Linux. Install Windows AD alternative in Linux. Free domain controller software in Linux

How to use tar --strip-components and zip --junk-paths with examples to strip absolute path in Linux and Unix. Force unzip / zip not to create a subdirectory

What is Unix or Linux Sticky Bit special permission. How to apply sticky bit for directories and files. What is the difference between small 't' and capital "T"

Learn about tar incremental backup with examples in Linux. You can use tar incremental backup script to automate tasks for backup and recovery in Linux/Unix

check last password change date in Linux check password expiration, check password status of system and active directory user. chage command examples.

Complete OpenSSL and PKI tutorial - generate keys, build a Certificate Authority, issue SAN and ECC certificates, configure mTLS, renew and revoke certificates. 24 hands-on lessons tested on Linux.

Learn how to check CPU usage in Linux using top, htop, vmstat, mpstat, sar, and ps commands. Monitor CPU utilization, load, and processes in real-time with practical examples.

Learn how to downgrade RPM packages in Linux using yum and rpm. This guide covers installing specific versions, handling dependencies, forcing downgrade, rollback using yum history, and fixing common errors in CentOS, …

Learn how to grep exact match in Linux using the grep command. This tutorial explains how to match exact words, exact strings, and entire lines using options like -w and regex patterns. Includes practical grep examples …

Learn how to mount a USB drive in Linux using command line tools. This step-by-step guide explains how to identify USB devices, install required filesystem packages, mount USB drives manually, verify mount points, …