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UNIXShell control structure & mdash; IF flow control (DecisionMaking) IF statements have three formats: first, if...fistatementwww.2cto.com. The following is an instance: [plain] catif1.sh #! /Bin/sha10b20 # ① if [$ a-eq $ B... UNIX Shell control

M. Tansley05/9948311Green84044J. Lulu06/9948317green92426P. Bunny02/9948Yellow123528J. Troll07/994842Brown-31226... Shell script learning Note 9-awk# Cat grade.txtM. Tansley 05/99 48311 Green 8 40 44J. Lulu 06/99 48317 green 9 24 26P. Bunny 02/99 48

1. Overview: System V semaphores use the semget, semop, and semctl functions to capture, operate, and control the semaphores. The operation objects are semaphores and semop operations. These objects are either all successful or all fail. 2.

Original source: http://www.cnblogs.com/xrq730/p/4865416.htmlCode optimization Details1. Specify the final modifier of the class and method as much as possibleA class with a final modifier is not derived. In the Java Core API, there are many

ObjectiveMarch 2016 revision, combined with their own work and the usual learning experience to re-talk about why the code optimization. Before I change it, I say this:Like a whale eating a shrimp, perhaps eating a couple of shrimp for the whale

JAVA optimization recommendations, JAVA Optimization Preface Code optimization is a very important topic. Some people may think it is useless. In some small places, what are the effects of modifying or not modifying the code on the code running

First, the problem introducedAbout the new and delete operators in C + +,We know that these two operators must exist in pairs to avoid memory leaks.This is considered common sense when learning, however, it is often difficult to actually write code

Summary of Java code Performance Optimization Preface   Code optimization is a very important topic. Some people may think it is useless. In some small places, what are the effects of modifying or not modifying the code on the code running

Error handling is a problem that needs to be solved in any language, and there is a mechanism for handling errors only if 100% is not guaranteed to operate correctly. Exception handling is one of the error handling methods.1 Process activity record (

Java Development code performance optimization summary, java code Performance Optimization Code optimization may be useless to some people. however, I think we should try our best to ask ourselves during the development process to develop good

ObjectiveCode optimization, a very important topic. Some people may feel useless, some small places have what good change, change and do not change the efficiency of the operation of the code has any impact? That's the question I'm thinking about,

Use of the MYSQLIFNULL Function The usage of the mysql ifnull function is described in detail below for your reference. If you have encountered similar problems in using the mysql ifnull function, take a look. Mysql ifnull (expr1, expr2)If expr1 is

Installation and configuration of MapR distributed cluster and shell automation script The distributed cluster Installation Process of MapR is still very difficult, far from being planned. I have summarized the installation configuration. Because

C ++ development of face gender recognition tutorial (16) -- video face gender recognition In the previous blog, we have been able to smoothly drive the camera to collect source images. In this blog, we will officially add the code for gender

Java code optimization (long-term updates) and java code optimization updates Preface Code optimization is a very important topic. Some people may think it is useless. In some small places, what are the effects of modifying or not modifying the code

ObjectiveCode optimization, a very important topic. Some people may feel useless, some small places have what good change, change and do not change the efficiency of the operation of the code has any impact? That's the question I'm thinking about,

Linux Shell programming-awk usage1. Use of awkBasic functions: browses and extracts information based on specified rules in a file or string. Only after awk extracts information can other text operations be performed. A complete awk script is

ObjectiveCode optimization, a very important topic. Some people may feel useless, some small places have what good change, change and do not change the efficiency of the operation of the code has any impact? That's the question I'm thinking about,

MAPR distributed cluster installation process is still very difficult, far from the simple Plan. I summarize the installation configuration, because the cluster has a lot of machines, manual each configuration is very tired, wrote an automated

1. A simple server time acquisition programThe server and client use UDP communication to write a simple time acquisition application.The process is generally straightened out, the first is the server-side writing, using the iterative way, no