Cheatsheets
Quick reference cards for developers — commands, syntax, and patterns.
3 min readIntermediate
IBM DB2 Administration Cheatsheet — Essential Commands (2026)
IBM DB2 LUW quick reference 2026. Commands for start/stop, connect, list databases, backup, users, locks, performance, and common error codes. DB2 11.1, 11.5, 12.x.
4 min readIntermediate
nmcli Cheatsheet 2026 — NetworkManager Command Line Reference
Complete nmcli cheatsheet covering device management, WiFi, static IP, DNS, VPN, and hotspot setup with real command-line examples for 2026.
5 min readBeginner
systemctl Cheatsheet 2026: Complete Command Reference
systemctl cheatsheet 2026. Service control, enable/disable, list units, system state, journalctl logs, boot analysis commands in one quick reference.
3 min read
MOL or SDF file format V2000
An MDL Molfile is a file format for holding information about the atoms, bonds, connectivity and coordinates of a molecule. Format was create by created by MDL Information Systems (MDL). Check here how to read this format.