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Quick reference for viewing the end of files, following logs, and using tail with lines, bytes, and pipelines in Linux ...

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.

Quick reference for monitoring processes, sorting tasks, filtering output, and managing processes with htop in Linux ...

htop is an interactive process viewer for Linux that shows CPU, memory, and swap usage in real time. This guide covers sorting, filtering, tree view, killing processes, and customizing the display.

Step-by-step instructions for upgrading Debian 12 Bookworm to Debian 13 Trixie, including sources.list changes, package upgrades, and post-upgrade verification.

Quick reference for finding open files, processes, ports, and deleted files with lsof in Linux ...

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.

Remove lines from files with sed using line numbers, patterns, ranges, and regular expressions. Covers preview mode, in-place editing, and common recipes.

Quick reference for fsck: check Linux filesystems, run safe repairs, force checks, review exit codes, and handle boot-time recovery ...

Quick reference for managing firewall rules with firewalld on Linux ...