Linux Commands
Command references for core Linux tools, syntax, examples, and practical one-liners.
Bash Arithmetic: Integer and Floating-Point Math
How to do arithmetic in Bash with the (( )) operator, $(( )) expansion, the let builtin, and bc or awk for floating-point math the shell cannot do natively.
rsync Exclude Patterns: Skip Files and Directories
Exclude files and directories from an rsync transfer with --exclude and --exclude-from, glob patterns, and dry-run previews, with copy-paste examples.
How to Use the kill Command in Linux
Learn how to use the kill command in Linux to terminate processes, send signals, and reload services with practical examples.
How to Install Podman on Ubuntu: Rootless Container Alternative to Docker
Step-by-step instructions for installing Podman on Ubuntu, running rootless containers, building images with Buildah, and switching from Docker.
nmcli Command in Linux: NetworkManager CLI Reference
The nmcli command manages NetworkManager from the terminal. This guide covers device status, Wi-Fi connections, static IP configuration, DNS settings, and scripting-friendly output.
systemctl Command in Linux: Start, Stop, and Manage Services
Manage services on systemd-based Linux distributions with systemctl. This guide explains how to start, stop, restart, enable, and disable services, reload unit files, and inspect service status.
netstat Command in Linux: Network Connections and Statistics
Use the netstat command to list network connections, listening ports, routing tables, interface counters, and TCP states on Linux.
fsck Command in Linux: Check and Repair Filesystems
Use the fsck command in Linux to check and repair filesystems safely, run read-only checks, fix unmounted partitions, and schedule boot-time checks.
Cut Command in Linux
The Linux cut command extracts fields, bytes, or characters from text files and pipeline output. Covers delimiter-based field selection, byte and character ranges, and practical examples.
git branch Command: Create, List, and Delete Branches
The git branch command creates, lists, renames, and deletes Git branches. This guide explains the full command reference with practical examples for local and remote branches, merged filters, and tracking upstream branches.
Ping Command in Linux
The ping command tests network connectivity by sending ICMP packets to a host and reporting latency, TTL, and packet loss.
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 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.
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.
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.
