b shell源码，对学习shell非常有帮助，同时也可以了解如何在linux下面实现一种shell。-b shell source, shell very helpful for learning.

BCH码的编码，解码程序(包括皮德森译码和BM迭代译码)，有详细注释。(The encoding and decoding procedures of BCH codes (including Peterson decoding and BM iterative decoding) are explained in detail.)