echo hello world

I. Process Control statements1. If statement①IF Single branch: one condition one resultIf condition then command fi②IF Dual Branch: One condition two resultsIf condition then command Else command 2fi③IF Multi-Branch: Multiple conditions

Directory index of this blog post[TOC]First, the Cognition function (a) What is a function?1, the function, the English called: function2. A function is a block of statements made up of several shell commands(b) Why should I use a function?1.

Shellshock analysis CVE-2014-6271 Some time ago, the shell-breaking vulnerabilities made various companies very busy. The vulnerabilities have been around for a while, and the analysis of the Internet has also been transferred. When they stop, it's

Today we learned the third object-oriented feature: polymorphicThe concept of polymorphism: When the parent class refers to a subclass instance, because the subclass overrides the parent class function, it causes us to use that reference to invoke

In Linux, non-interactive remote command execution scripts (better than ssh) are available on each machine. ssh and scp are often used in our daily life. However, as the number of machines to be managed grows, it is unrealistic to log on to the

System O & M skills (1) -- chattr and lsattr commands we have the requirement that a file cannot be modified, deleted, or added only, so we can use the chattr command. [Plain] [root @ serv01 test] # cat note.txt 1. don't be late 2. do not leave

First, PHP upper and lower shell sensitive1) All user-defined functions, classes, and keyword are sensitive.For example, the following results are output consistent:echo "Hello World"Echo "Hello World"EcHo "Hello World"2) User-defined variables,

PHP case sensitivity: function names and class names are not differentiated, and variable names are differentiated. PHP handles case-sensitive issues in disorder and may occasionally encounter issues when writing code. So here is a summary. However,

You can use echo & quot; helloworld anywhere in the php program! & Quot; to output the content you want to output. But you will encounter the following troubles: 1-when you try to add two (or more) Spaces Between hello and world, you use: echo &

In the past one or two years, the Lenovo software Hyperstar studio, PersonalHypertextPreprocessor, seems to have become the most widely used web page processing language on LinuxUnix. it is convenient, powerful, and open source code (OpenSource) as

Hello everyone, this time we will introduce some network configurations under liunx, simple basic optimization of shell, and level adjustment first. There are also some commands for you to take a look. Statement: I like to share with others. I am

I downloaded the ci, slim, and laravel frameworks and uploaded them to my ubuntu + nginx + php host. However, I found that a test is stored in any directory of the three frameworks. the PHP file outputs echo & quot; helloworld & quot;, which can

PHP handles case-sensitive issues in disorder and may occasionally encounter issues when writing code. So here is a summary.However, I do not encourage you to use these rules. We recommend that you always adhere to the "Case sensitivity" and follow

Six Methods for executing Linux shell commands in Ruby: rubyshell In Ruby, executing shell commands is not surprising. Ruby provides about six methods for developers to implement. These methods are very simple. This article will introduce how to

Echo (), print (), print_r () usage in php. My understanding of the echo (), print (), print_r () function is that echo can input string variable constants, and print is similar to echo, however, print_r can print arrays, but the first two are not

The Yii Framework tutorial can be found in the official Chinese documentation, so why write this development tutorial? The purpose of this tutorial is to help Windows desktop apps or ASP. NET programmers get a quick grasp of the PHPYII Framework

This is a creation in Article, where the information may have evolved or changed. Docker-Small Li Fei-like virtualization solution About Docker Docker is an open platform for developers, system administrators to create, distribute, and ultimately

This article mainly introduces the case sensitivity issue of PHP. the variable names in php are case sensitive, while the function names and class names are case insensitive, there may be occasional issues when writing code, so here is a

In the reading Yii2 source of contact with the trait, learn a bit, write down the blog record. Since PHP 5.4.0, PHP has implemented a method of code reuse, called traits. Traits is a code reuse mechanism that is prepared for PHP-like

Caching in ZendFramework is performed by the front-end, and through the backend adapter (File, Sqlite, Memcache ...) And a flexible IDs and Tags system (identifier and tag system) to store cache records. module (Zend_Cache_Core) 1. fast Zend_Cache