等闲之辈莫等闲

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Centos静态路由增加实例

有时候我们需要针对网卡增加某段路由。  阅读全文...

Scala 是什么？

Scala 是一门多范式（multi-paradigm）的编程语言，设计初衷是要集成面向对象编程和函数式编程的各种特性。  阅读全文...

oracle启动em企业管理器

Starting Oracle Enterprise Manager 11g Database Control  阅读全文...

centos7官方启动脚本

centos 7.3需要用systemctl 命令启动nginx.service  阅读全文...

shell计算距离生日的天数

利用时间戳计算秒差，除以天的秒数86400.  阅读全文...

有多少种方式可以在vim 中插入行号

添加行号对Vim来讲是小菜一碟  阅读全文...

shell获取随机字符串

0、tr -dc a-z < /dev/urandom | head -c4  阅读全文...

kernel nf_conntrack: table full, dropping packet

“连接跟踪表已满，开始丢包”！  阅读全文...

grep [:digit:]实例

Finally,  certain  named  classes  of  characters are predefined within bracket expressions, as follows.  Their
names are self explanatory, and they are [:alnum:],  [:alpha:],  [:cntrl:],  [:digit:],  [:graph:],  [:lower:],
[:print:], [:punct:], [:space:], [:upper:], and [:xdigit:].  For example, [[:alnum:]] means [0-9A-Za-z],  阅读全文...