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How to Check Listening Ports in Linux: ss, netstat, lsof
Use ss, netstat, or lsof to list all listening ports in Linux, identify which process is using a specific port, and filter results by protocol or port number.

How to Unzip Files in Linux
Extract ZIP archives in Linux with the unzip command: unzip to a folder, handle password-protected and multiple archives, list or test contents, and exclude files.

How to Use Nano, the Linux Command Line Text Editor
Learn the essential nano commands and keyboard shortcuts: open, save, and exit files, search and replace text, copy and paste, and use sudo nano to edit system files.

Fix SSH "Host Key Verification Failed" Error
Resolve the SSH Host key verification failed error by removing the stale known_hosts entry with ssh-keygen -R after verifying the server is genuine.

Hard Links vs Symbolic Links in Linux
Understand the difference between hard links and symbolic links in Linux: how inodes work, when each type breaks, and which one to use for a given task.

date Command in Linux: Format, Timezone, and Epoch
Format dates, convert timezones, and work with Unix timestamps using the Linux date command, with copy-paste examples for the terminal and shell scripts.

How to Mount and Unmount File Systems in Linux
Mount and unmount file systems in Linux with the mount and umount commands. Examples cover USB drives, ISO files, NFS shares, bind mounts, and persistent /etc/fstab entries.

Check Linux Version: Find Your Distribution and Kernel Release
Check your Linux version from the terminal with /etc/os-release, hostnamectl, lsb_release, and uname. See when each command is useful.

How to Mount an exFAT Drive on Ubuntu
Modern Ubuntu releases read and write exFAT drives out of the box. This guide shows how to mount exFAT USB drives and SD cards automatically or manually, install exfatprogs, set up an fstab entry, and fix common mount errors.

How to Install NVIDIA CUDA Toolkit on Ubuntu 26.04
Install the NVIDIA CUDA Toolkit on Ubuntu 26.04 from the Ubuntu archive or NVIDIA repository, then verify the driver, nvcc compiler, and CUDA sample output.

Series
Cheatsheets
date Cheatsheet
Quick reference for the Linux date command covering display formats, format specifiers, relative dates, timezones, Unix timestamps, and setting the system clock.
PostgreSQL Cheatsheet
Quick reference for connecting to PostgreSQL, managing databases and roles, granting privileges, and running backup commands.
pip Cheatsheet
Quick reference for pip commands covering package installation, version constraints, requirements files, upgrades, virtual environments, and configuration.
cut Cheatsheet
Quick reference for extracting fields, bytes, and characters with cut in Linux




