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Quick reference for recursive text searches with the ripgrep command ...

The ripgrep command searches directories recursively while respecting ignore files. This guide explains rg syntax, file type filters, context lines, replacement previews, and config defaults.

The whois command looks up domain registration, registrar, name server, expiry, IP allocation, and AS number details from Linux.

Install Zsh on Ubuntu, set it as the default shell, configure ~/.zshrc, and add Oh My Zsh themes and plugins for daily terminal work.

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.

Docker networking controls how containers communicate. This guide covers bridge, host, and none networks, port publishing, container DNS, isolation, and Compose networking.

Quick reference for listing sockets, listening ports, connection states, and process owners with the ss command ...

Step-by-step instructions for installing and configuring Nginx on Debian 13 Trixie using apt, including UFW rules, the systemd service, and your first server block.

Step-by-step instructions for installing Podman on Ubuntu, running rootless containers, building images with Buildah, and switching from Docker.

Bash string manipulation using parameter expansion: extract substrings, replace text, strip prefixes and suffixes, change case, and check for substrings with practical examples.