From Concentric Sky:
Linux Quick Reference for the iPhone is a highly detailed guide to multiple distributions of Linux. With it, you can quickly find information on various package management systems, distro specific file locations, and common commands. It includes a core command reference with the full man pages for all common commands. The interface has been optimized for display on the iPhone and long pages can be read with ease. This app includes a cheat sheet for the Linux core file system, quick command recipes for common admin tasks, a breakdown of various package management systems with real life use cases, handy guide to where various distros keep important files, bash reference guide that includes shortcuts and shell variables, and core Command reference.