Linux Commands
Command references for core Linux tools, syntax, examples, and practical one-liners.
How to Check Linux Version
Find which Linux distribution and version is installed on your system using /etc/os-release, lsb_release, hostnamectl, and other command-line methods.
w Command in Linux: Show Logged-In Users and Activity
Learn how to use the w command in Linux to see logged-in users, idle time, load averages, and what each user is doing.
sysctl Command in Linux: View and Change Kernel Parameters
Learn how to use the sysctl command to view, set, and persist Linux kernel parameters, with practical examples for common settings.
How to Unzip a .gz File in Linux
Unzip a .gz file in Linux with gzip or gunzip, keep the original file when needed, and extract .tar.gz archives with tar.
whereis Command in Linux: Find Binary, Source, and Man Pages
The Linux whereis command locates the binary, source, and manual page files for a given command. This guide covers all options with practical examples.
git clone: Clone a Repository
How to use git clone to copy a remote or local repository, clone a specific branch, and create shallow clones, with examples for HTTPS and SSH.
date Command in Linux: Format, Timezone, and Epoch
Step-by-step guide to the Linux date command: format output, convert timezones, work with Unix timestamps, and set the system clock.
whoami Command in Linux: Display the Current User Name
The whoami command shows the current effective username on Linux. This guide explains syntax, practical examples, shell script usage, and how it compares to id -un and $USER.
How to Copy Files and Directories in Linux
Step-by-step guide to copying files and directories in Linux with the cp and rsync commands. Covers recursive copies, preserving permissions, and common examples.
jobs Command in Linux: List and Manage Background Jobs
The jobs command lists background and suspended processes in the current shell session. This guide covers syntax, options, job specifications, and practical examples.
git diff Command: Show Changes Between Commits
How to use git diff to compare working directory changes, staged files, commits, and branches — with practical examples and common options explained.
git log Command: View Commit History
How to use git log to browse commit history, filter by author, date, and keyword, view changed files, display branch graphs, and format output for scripts and terminals.
dmesg Command in Linux: Read and Filter Kernel Messages
How to use the dmesg command in Linux to read kernel ring buffer messages, filter by log level and facility, display human-readable timestamps, and watch for new events in real time.
paste Command in Linux: Merge Lines from Files
Use the paste command in Linux to merge lines from multiple files side by side, change delimiters, and serialize output with practical examples.
git stash: Save and Restore Uncommitted Changes
How to use git stash to temporarily save uncommitted changes, switch branches, and restore your work — with examples for stashing untracked files, named stashes, and partial stashes.
rpm Command in Linux: Install, Query, and Verify Packages
Use the rpm command in Linux to install, upgrade, remove, query, and verify RPM packages on Fedora, RHEL, AlmaLinux, Rocky Linux, and other RPM-based distributions.
How to Transfer Files with Rsync over SSH
Use rsync over SSH to copy and synchronize files and directories between local and remote systems, with examples for custom ports, dry runs, compression, and progress display.
pstree Command in Linux: View the Process Tree
Use the pstree command in Linux to display running processes as a tree, show PIDs and PGIDs, trace parent processes, and highlight specific branches.
Linux File Permissions Explained
Linux file permissions control who can read, write, and execute files and directories. This guide explains permission classes, symbolic and numeric chmod modes, and special bits such as setuid, setgid, and the sticky bit.
du Command in Linux: Check Disk Usage
The du command reports disk space used by files and directories. This guide covers human-readable output, summary totals, depth limiting, sorting by size, and practical examples.
