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#! /Bin/shStatus = "$? " Testexit (){CAT/etc/passwd | awk '{print $1}' | grep-Q $ userIf [$ status-EQ 0]; thenEcho "User exist, please Chang a user name"ExitElseEcho "User adding"Fi} Useadd (){Useradd $ user-p $ pass-d $ userhIf [$ status-EQ 0];

5 whileNumber of cyclesFoo = 1 // initial cyclic valuesWhile ["$ foo"-le 2] // le: DoEcho "Are you there"Foo = $ ($ Foo + 1) // This form is very important to foo ++Done 6Until ConditionDoStatementsDoneThe until loop is executed repeatedly until the

Http://hi.baidu.com/realxfliu/blog/item/f6fe14e96463b83fb90e2d35.html   1. Use command lines to guide the Linux operating system There is no difficulty in guiding the operating system process through the command line; it is nothing more than

Next I will introduce how to install the livna graphics card driver in Fedora 7 (applicable to nvidia and AMD ). First, add livna's software library (repository) to Fedora 7 to use yum for installation and upgrade. Procedure:1. Under X-window, right-

Why did Sina blog do this? This post was last edited by lghyt1 on 2013-12-16 20:44:05 var $abc = 10;function db () {}?> This direct copy to the Sina blog when saved, the blog does not display, and remove the PHP tag can be, it is strange. Why

How to run PHP scripts and PHP variables in the Dede template When using the Dede template, it is often necessary to directly deal with the underlying fields of the Dede database, if there is no corresponding function in the Dede, we often need to

Why did Sina blog do this? var $abc = 10; function db () { } ?> This direct copy to the Sina blog when saved, the blog does not display, and remove the PHP tag can be, it is strange. Why does Sina do so? Not only that, there is no echo ' in

PHP, like JavaScript, is also a scripting language.PHP This is the script that executes on the server, and JavaScript is the script that executes on the client.PHP Code/* Multi-line Comment */?>Output string: ①.echo ' Hello World '; echo can output

0. PrefaceIt's been a while since I've been concentrating on web security for a while, but looking at the back is a bit complicated, involving more and more complex middleware, bottom-level security, vulnerability research, and security, so here's a

#### ##### #1 . Virtual Console ##### #######Ctrl+alt+f (1|7) into the graphCtrl+alt+f (2~6) into the Virtual ConsoleRed hat Enterprise Linux Server 7.0 (Maipo) # # system versionKernel 3.10.0-123.el7.x86_64 on a x86_64 # # kernel version , number

File:/home/kiosk/desktop/09.24 Page 1 of 7######## Virtual Machine Control ###########[[Email protected]]$ rht-vmctl start Desktop # # #开启虚拟机desktopStarting desktop.[[Email protected]]$ rht-vmctl View Desktop # # #显示虚拟机desktop的视图[[Email protected]]$

The return status value of the shell environment based on the command execution ($?). ) to determine if the execution succeeds, when the return value of 0 indicates success, otherwise (not 0 value) indicates a failure or an exception. Using a

Jump out of loops and function return values one, exit cycleIn shell programming, there are usually two ways to exit a loop:Contine: Is the end of the execution of the loop, the default is Contine 1, when contine 3 o'clock, then the 3rd layer

Switch users: Enter su-username at the command prompt Note: Advanced users switch to low-level users do not require a password, low-level users need a password to switch identities. 650) this.width=650; "Src="

Write a script/root/bin/yesorno.sh, prompt the user to enter Yes or no, and determine whether the user entered Yes or no, or other information #!/bin/bashread-p "Put your answer (yes or no):" Answercase $Answer iny| y| [YY] [EE]                 

First, installation and upgradeUse custom to customize the installation, unnecessary packages as far as possible, if necessary to add password restrictions to the Lilo/grub bootloader, after the installation is completed using Up2date, yum or apt

General computer in the process of using the integrated sound card can not work properly, such as: 1 Microphone no echo 2 speaker can not make a sound 3 driver installation can be judged bad. At this point you can buy an independent sound card to

PrefaceWhen you debug a program under a Linux terminal, you sometimes need to output a lot of information. If you can control the color and display of the font, you can make the output information sharp contrast, easy to observe the data during

The code is as follows Copy Code php Tutorial reads Excel and queries the specified data Performance Inquiry System Description:Please enter the correct and complete data .This inquiry system is for reference only, the actual

1. Connect to each other MySQL server mysql-u root-h 192.168.0.1mysql.exe This program in the Bin directory where you installed MySQL 2. Let's take a look at some of the server database MySQL >show databases; MySQL default installation will have