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How to use parentheses in Shell

Square brackets are divided into single square brackets [] and double square brackets [[]]. Square brackets are generally used in expression judgment, and parentheses can also be used in expressions, which will be mentioned later.

Nov 23, 2016 pm 05:41 PM

Shell

How to use Pyintaller

Nov 23, 2016 pm 05:37 PM

Pyintalle

linux ntp service establishment

When there are too many servers, whether the time is accurate or consistent is a problem. So consistent timing is necessary. The following is how to configure a Linux time server within a LAN.

Nov 23, 2016 pm 05:32 PM

linux

PowerShell creates a PTR reverse query for existing DNS records

This morning Douzi accidentally discovered that the company's DNS server only had forward resolution but no corresponding PTR record. In other words, the IP address can be resolved through the domain name, but the IP address cannot find the domain name when reversed.

Nov 23, 2016 pm 05:25 PM

PowerShell

Some details of mybatis

Nov 23, 2016 pm 05:09 PM

mybatis

linux and git records

Nov 23, 2016 pm 04:00 PM

git github linux

Use emoji characters to form any Chinese character

Nov 23, 2016 pm 03:51 PM

emoji

What does mean in web pages?

What does <th></th> mean in web pages?

Nov 23, 2016 pm 03:23 PM

JS CSS HTML

SpringMVC implements image upload

If we use byte streams to implement file upload, the amount of code will be large and inefficient, so springMVC provides us with our own method.

Nov 23, 2016 pm 03:05 PM

SpringMVC

PHP random number C extended random number

Because a fixed-length random string is used.

Nov 23, 2016 pm 02:34 PM

PHP

SQL Server lock type

Nov 23, 2016 pm 02:29 PM

SQL Server

GIT transfer protocol implementation

Among the three mainstream transmission protocols of GIT, HTTP SSH GIT, the GIT protocol is the least used protocol (that is, the protocol whose URL starts with git://). This is because the git protocol has almost no permission control, either all can be read, all can be written, or all can be read and written. So for code hosting platforms, the purpose of the git protocol is only to support read-only access to public projects.

Nov 23, 2016 pm 02:18 PM

git c++ 版本控制代码托管网络编程