cheat sheets 是个不错的网站，在通过gem在命令行下能显示常见工具的cheat sheet。下面是ZTD的sheet的输出结果。 $cheat ztd ztd:   Zen Things Done (ZTD)   aka "Minimal ZTD: The Simplest System Possible"   For more info see   http://zenhabits.net/2007/04/minimal-ztd-the-simplest-system-possible/      The Four Habits   ————-   1. Collect     * Write down any tasks, ideas, projects, or other information that pop into     your head.     * Get it out of your head and onto paper.      2. [...]