rc后缀来源于Unix系统的前辈CTSS，它其中有个叫做“runcom”的命令脚本功能。早期的Unix版本使用rc在操作系统启动脚本的文件名中，以尊重CTSS的成果。
The ‘rc’ suffix goes back to Unix's grandparent, CTSS.
It had a command-script feature called "runcom". Early
Unixes used ‘rc’ for the name of the operating system's
boot script, as a tribute to CTSS runcom.
http://stackoverflow.com/questions/11030552/what-does-rc-mean-in-dot-files
