Terminal-oriented references grouped by topic. Short sections, practical examples, and fast navigation.
Pattern scanning and text processing — fields, built-in variables, functions, and practical one-liners.
guides.fdrian.me/awk guideStream editing — substitution, addresses, hold space, branching, and practical one-liners.
guides.fdrian.me/sed guideEveryday commands, workflow references, and practical shortcuts for daily version control.
guides.fdrian.me/gitUnit files, service management, journalctl, timers, and drop-in overrides for daily administration.
guides.fdrian.me/systemd guideProprietary driver install on Debian 13, Wayland setup, Secure Boot MOK, and dual boot with Windows.
guides.fdrian.me/nvidia guideDisk encryption with cryptsetup — setup, keyslot management, boot integration, and header backup.
guides.fdrian.me/luks guideAndroid Debug Bridge — device connection, shell commands, logcat, dumpsys, and debugging workflow.
guides.fdrian.me/adbKeys, config, agent, tunnels, port forwarding, and jumphosts for remote access.
guides.fdrian.me/ssh guideKey management, encryption, signing, and keyserver publishing with GnuPG.
guides.fdrian.me/gpg guideKey generation, certificates, symmetric and asymmetric encryption, and TLS diagnostics.
guides.fdrian.me/openssl guideHost discovery, port scanning, service and OS detection, NSE scripts, and output workflows.
guides.fdrian.me/nmap guidePacket capture, BPF filters, pcap rotation, inspection, and recipes for day-to-day debugging.
guides.fdrian.me/tcpdump guideVPN CLI — relay selection, WireGuard tuning, obfuscation, DAITA, kill switch, and split tunneling.
guides.fdrian.me/mullvad guideMesh VPN CLI — tailnet, MagicDNS, exit nodes, subnet routing, Taildrop, Serve and Funnel.
guides.fdrian.me/tailscale