Linux Commands
Command references for core Linux tools, syntax, examples, and practical one-liners.
Basic Linux Commands Every User Should Know
The basic Linux commands you need for file management, navigation, permissions, networking, and package management, with practical examples for beginners and system administrators.
Tcpdump Command in Linux
tcpdump is the standard command-line packet analyzer for Linux. This guide covers capturing traffic, filtering by host and port, reading output, and saving captures to a file.
How to Use the gunzip Command in Linux
The gunzip command decompresses .gz files on Linux. This guide covers the most common options with practical examples.
git fetch vs git pull: What Is the Difference?
git fetch and git pull both download changes from a remote repository, but only one updates your current branch. This guide explains the difference, when to use each command, and how to avoid merge surprises.
git cherry-pick Command: Apply Commits from Another Branch
How to use git cherry-pick to apply commits from one branch to another, including single commits, ranges, conflict handling, backports, and merge commits.
Nginx Commands You Should Know
Reference for the most-used Nginx commands on Linux: start, stop, restart, reload, test config, dump config, check version, and read logs with systemd.
ufw Command in Linux: Uncomplicated Firewall Reference
Reference for the ufw command on Linux, with examples for enabling the firewall, allowing and denying traffic, deleting rules, and managing application profiles.
who Command in Bash: List Logged-In Users
The who command lists currently logged-in users, along with their terminal, login time, and remote host. Use it to see active sessions, system boot time, and the current runlevel.
How to Check the Kernel Version in Linux
Three quick ways to find the Linux kernel version from the command line: uname, hostnamectl, and /proc/version.
file Command in Linux: Determine File Types
Identify file types from the command line using the Linux file command. Covers basic usage, MIME types, compressed files, symlinks, and the magic database.
Chattr Command in Linux (File Attributes)
How to use chattr and lsattr to set and view file attributes in Linux, including immutable files, append-only logs, and recursive protection.
env Command in Linux: Show and Set Environment Variables
The env command prints environment variables and runs programs with a modified environment. This guide covers env syntax, running commands with custom variables, clean environments, and portable shebangs.
nmap Command in Linux with Practical Examples
Use the nmap command in Linux to discover hosts, scan ports, detect services, and understand common scan options such as -sn, -Pn, and -sV.
id Command in Linux: Display User and Group Information
The id command prints real and effective user IDs, group IDs, and supplemental group memberships for any user on a Linux system.
sed Delete Lines: Remove Lines by Number, Pattern, or Range
Remove lines from files with sed using line numbers, patterns, ranges, and regular expressions. Covers preview mode, in-place editing, and common recipes.
How to Rename Directories in Linux
Rename single or multiple directories from the Linux command line using the mv command, for loops, and the rename utility.
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.
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.
