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Git common syntax [TOC] Introduction to Git describe Git (pronounced / g) ɪ t/. ) It is an open source distributed version control system, which can effectively and quickly deal with the version management of projects from very small to very large. Git is an open source version control software developed by Linus Torvalds to help manage Lin ...

1, Judgment: if 1. Single branch mode if Condition test then Command sequence fi if Condition test ; then Command sequence fi Case: [root@localhost jiaofan]# cat b.sh #!/bin/bash if [ -z $1 ] then echo "Error: service name not entered" echo "Usage: script name server name" fi if systemctl is-active $1 &> /dev/null ; then ec ...

KingbaseES logical backup and restore tool provides online backup and restore function at database object level. Backup objects include: database pattern surface view constraint jurisdiction trigger function sequence The output format of logical backup includes: Binary SQL script In addition, for table data, it also supports the e ...

1. grep tool grep is a * * line * * filtering tool; Used to filter rows based on keywords Syntax and options Syntax: # grep [options] 'keyword' file name Common options: OPTIONS: -i: Case insensitive -v: Finds a row that does not contain the specified content,Reverse selection -w: Search by word -o: Print matching ke ...

Undertaking ZONE of linux Kernel Things , the physical memory of a node is managed by dividing it into zone s as needed, and each node is managed by pg_data_t Manage (refer to if you want to know) SPARSE(3) of the physical memory model for those things in the linux kernel For NUMA systems: Each node has its own local memory, so it has its ow ...

preface Recently, I chose the elective course of Linux kernel principle. Although the class is relatively short, the content involved can only cover a small part of Linux knowledge, the teacher's level is really high and the knowledge is very in-depth. The small assignment this time is to write C language program under Linux platform to realiz ...

catalogue 1, Servlet core interfaces and classes 1.1 Servlet interface 1.2 GenericServlet abstract class 1.3. HttpServlet class (recommended) 1.4 notes 2, Two configurations of servlet s 2.1 configuring web XML (used before servlet 2.5) 2.2 # using annotations (supported after servlet 3.0, recommended) 1, Servlet core interfaces and c ...

1: Event loop pool class Event loop pool is a singleton class that manages EventPoller 1. EventPollerPool constructor EventPollerPool::EventPollerPool() { auto size = addPoller("event poller", s_pool_size, ThreadPool::PRIORITY_HIGHEST, true); InfoL << "establish EventPoller number:" << size; } 2: Adding EventPoller to ...

As a patient with obsessive-compulsive disorder, he has always been obsessed with automatic deployment. Personally, I think the most important thing of automatic deployment is stability and reliability. After research and testing, GitHub and Tencent cloud The two platforms have successfully completed the practice of fully automatic deployment o ...

Linux operating system learning 1, Linux system Linux system startup process Kernel boot: When the computer is powered on, the first is BIOS power on self-test, which starts according to the boot device (usually hard disk) set in BIOS. After the operating system takes over the hardware, first read the kernel file in the / boot director ...