Linux Commands
Command references for core Linux tools, syntax, examples, and practical one-liners.
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.
tail Command in Linux: View the End of Files and Follow Logs
Practical examples of the tail command for viewing the end of files, following logs in real time, and combining tail with grep and other tools.
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.
lsof Command in Linux: List Open Files and Network Connections
The lsof command lists every open file, socket, and network connection on a Linux system. This guide covers how to find what is using a port, trace open files by process or user, and recover disk space from deleted but held-open files.
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.
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.
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.
