摘要：
Ping: check connection (knock on the door of remote server).Telnet: gives access to remote system if it is running telnet daemon.But however, if you w... 阅读全文
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摘要：
Ping: check connection (knock on the door of remote server).Telnet: gives access to remote system if it is running telnet daemon.But however, if you w... 阅读全文
摘要：
###关于NULL的运算mysql的NULL字段是一个大坑呀~~* 普通运算符SELECT NULL, 1+NULL, CONCAT('Invisible',NULL), ('aaa' = null), ('aaa' != null);这个命令, 每一个列都是NULL.也就是说任何有NULL参... 阅读全文
摘要：
sudo python main.py 上面这个命令会启动两个进程. root 23291 0.0 0.0 147980 1928 ? S 19:48 0:00 sudo python main.py get_meituan_room root ... 阅读全文
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