Popen method usage

http://www.cnblogs.com/Security-Darren/p/4733368.html
http://blog.csdn.net/longshenlmj/article/details/45174363
http://www.cnblogs.com/topplay/p/3860400.html
https://blog.linuxeye.cn/375.html
http://www.cnblogs.com/songwenlong/p/5940155.html
http://python3-cookbook.readthedocs.io/zh_CN/latest/c13/p06_executing_external_command_and_get_its_output.html

subprocess with timeout

https://stackoverflow.com/questions/1191374/using-module-subprocess-with-timeout
https://stackoverflow.com/questions/36952245/subprocess-timeout-failure
https://www.programcreek.com/python/example/56781/subprocess.TimeoutExpired
https://www.blog.pythonlibrary.org/2016/05/17/python-101-how-to-timeout-a-subprocess/
https://dzone.com/articles/python-101-how-to-timeout-a-subprocess
https://everettjf.github.io/2016/01/29/python27-subprocess-timeout/
http://everettjf.com/2016/01/29/python27-subprocess-timeout/
https://www.jianshu.com/p/a58491d1abf8
http://www.itguai.com/python/a5779708.html
http://codewenda.com/python%EF%BC%8Cpopen%E5%B9%B6%E9%80%89%E6%8B%A9-%E7%AD%89%E5%BE%85%E8%BF%9B%E7%A8%8B%E7%BB%88%E6%AD%A2%E6%88%96%E8%B6%85%E6%97%B6/
http://stackoverflow.org.cn/front/ask/view?ask_id=5953
https://python.freelycode.com/contribution/detail/244
http://codewenda.com/%E4%BD%BF%E7%94%A8%E6%A8%A1%E5%9D%97subprocess%E4%B8%8E%E8%B6%85%E6%97%B6/
https://codeday.me/bug/20170308/5946.html
http://www.redicecn.com/html/Python/20120906/434.html
http://outofmemory.cn/code-snippet/6725/python-subprocess-module-jiankong-zi-process-2-zhong-mode-mang-wait-directly-return-tongshi-setting
https://ask.helplib.com/python/post_804800
https://gist.github.com/wkettler/9235609

http://www.crazyant.net/1319.html
https://majing.io/posts/10000003481150

subprocess with realtime output

http://zrq.org.cn/?p=222
http://www.voidcn.com/article/p-aobdgfcq-bad.html
http://blog.csdn.net/jtujtujtu/article/details/47949775