example if

Use of if in shell, shellif useCompare if in shellShell determines whether an array contains an element:Ary = (1 2 3)A = 2If [["$ {ary [@]}" = ~ "$ A"]; thenEcho "a in ary"ElseEcho "a not in ary"FiThe method to compare the two strings is as

Binary comparison operator, which compares variables or numbers. Note the difference between numbers and strings. Integer comparison -Eq equals to, for example, if ["$ a"-eq "$ B"]-Ne is not equal to, for example, if ["$ a"-ne "$ B"]-Gt is greater

  1. The vertical line in the frame (a self-made graph) can be left and right to change the frame. Attachment: splitor Project Splitor.html   2. Text Box Verification: Check. js (defined attribute rules allownull, isdigital, isint, allowzero,

The method to compare the two strings is as follows: If ["$ test" x = "test" X]; then The key points here are:1. Use a single equal sign2 Note that there is a space on both sides of the equal sign: This is a UNIX shell requirement.3. Note that

[Determine user logon] is the PHP process correct? Every time I query the data inventory COOKIE, I make my own PHP to determine whether the user is logged on: [Process] 1. First, determine whether there is a cookie ('uid') & cookie ('uid'). If no

Burp suite's intruder module (iii) intruder introduction: Burp intruder is a powerful tool used to automatically customize attacks against web applications. It can be used to automatically execute all types of tasks that may occur during your

Baidu search syntax What I saw on the Internet is very practical .. Baidu product-Web search-Advanced Search1. Remove irrelevant materials to search for "Martial Arts Novels", but do not include "Gu Long", you can use the following query: "martial

mysql| server as a MySQL administrator, a common goal is to ensure that the server is as running as possible, so that the client can access it at any time. However, it is sometimes best to shut down the server (for example, if you are relocating a

Caching and caching Typically, applications can store frequently accessed data and data that requires a large amount of processing time to be created in the memory, thus improving performance. For example, if an application uses complex logic to

Select the MYSQL column typeWhen creating a table, how does one determine which types to use? This section describes the factors that should be taken into account before making a decision. The most "common" column type is the string type. Any data

Asp. NET cache concept and its application analysisAsp. What is a net cache? Asp. What does the net cache look like? This article provides you with a detailed description of the ASP.Asp. What is the net cache concept? Typically, applications can

Developers have always asked Microsoft to add more multithreading functions for VB, as does VB. NET. VB6 supports the establishment of multi-threaded EXE, DLL and OCX. However, the use of multithreading may be inaccurate. Therefore, VB6 only

Link: http://www.admin10000.com/document/2558.html This article mainly discusses how to choose a company, how to interview, how to talk about salary and other practical issues. The description may be biased for reference only. I. Why do I quit and

Understand cron concepts The cron daemon is a small subsystem composed of utilities and configuration files. cron of a certain style can be found in almost all UNIX-like systems. CronComponents include the daemon itself, a set of system-wide

Link: Warning lnk4098: the default library "libcmtd" conflicts with other libraries; Use/nodefaultlib: Library Category: small applications Read by 1037 Comment (0) Favorites Report   This warning message is often encountered in the

Getting started with http://www.cnblogs.com/Fancyboy2004/archive/2009/04/28/1445637.html cuda-GPU hardware architecture Here we will briefly introduce that NVIDIA currently supports Cuda GPU, Which is executing CudaProgram(Basically, its shader

If you send a request to your server to display a webpage on your website (for example, when a user accesses your webpage through a browser or crawls the webpage on googlebot, your server returns the HTTP statusCodeTo respond to this request. This

Do you really understand the layered architecture? -- Sources for friends who have been "poisoned" by petshop: Zhang Yang Blind spots The layered architecture on the. NET platform (called the "three-tier architecture" by many friends) seems to be a

Developers have always asked Microsoft to add more multithreading functions for Vb, as does VB. NET. VB6 supports the establishment of multi-threaded EXE, DLL and OCX. However, the use of multithreading may be inaccurate. Therefore, VB6 only

According to the cygwin user guide, I hope to help you. Indicate errors. 1 IntroductionCygwin is a UNIX simulation environment running on the Windows platform. It is a free software developed by Cygnus solutions. (The company has developed many good