bash 命令研究

1、断言 assert

https://www.cnblogs.com/ggzss/archive/2011/08/18/2145017.html

2、循环

http://blog.51cto.com/151wqooo/1165771

https://linuxstory.gitbooks.io/advanced-bash-scripting-guide-in-chinese/content/source/part3/11_2_nested_loops.html

3、多行注释

http://www.jb51.net/article/58236.htm