Lt1. Linux, GNU, diskless, single floppy, 1.44MB, 2MB flash RAM, ramdisk, rescue disk.

SGI IRIX 6.5. Misc user tips.

ZeroMQ async messaging. Can run brokerless. Runs on top of ITC, IPC, PGM, TCP, TIPC, UDP, or VMCI. BSD sockets-like API. REQ-REP, PUB-SUB, and PUSH-PULL pattern.

Your own blog like Hugo framework, minima-crystallabs theme. Clone and run. Quick success.


Computer cartography. OpenStreetMap (OSM), MapProxy. WMS, WMTS, Slippy, TMS, KML. Custom tile proxy and cache.

Computer cartography. OpenStreetMap (OSM), Leaflet, Slippy. Custom map viewer.

Computer cartography. OpenStreetMap (OSM), Mapnik, Tirex. WMS, TMS, WMTS, KML, Slippy. Leaflet, OpenLayers, QGIS, Marble. iD, JOSM, Vespucci, Go Map!!. GPS, GPX.


GNU/Linux and Debian GNU documentation. Where is it, how to access it. Man, info, tldr, /usr/share/doc/, TAB, IRC, RFCs, HOWTOs, FAQs, kernel docs. Quiz.

Original Unix, BSD, GNU, and Linux books, papers, videos, and similar materials.

Origins and history of Unix. CTSS, BTS, Multics, ITS, Unix, C, BSD, Unix wars, Motif, CDE, GNU, Linux. AT&T, Bell Labs, CSRG, UCB, Sun Microsystems, Novell.


Git. Multiple repository origins. Projects mirrored at different hosting platforms.

Introduction to file versioning. History of version control tools SCCS, RCS, CVS, Subversion, BitKeeper, and Git. Funny story.


Three-point VPN Gateway. WireGuard, IPTables/NFTables, DNS, dnsmasq. VPN server and Internet gateway on different machines.

Physical one-way data link. 100Mbps ethernet + UDP/IP. File transfer with ncat or socat and tar.


Docker. Images and Containers. Description and use.