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Tags: description command gadget should--standard standard output dev fileThis article was reprinted from: 11595985By default, there are always three files open, standard input (keyboard input), standard output (output to screen), standard error (also output to screen), and their respective file descriptors are 0,1,2. So let's take a look at the differences between the following redirection methods:>/dev/null 2>1In fact, it should be equivalent to thi

On the shell:0 indicates standard input1 indicates standard output2 indicates standard error output> default to standard output redirect, same as 1>2>1 means redirecting the standard error output to the standard output.>file means to redirect both the standard output and the standard error output to fileTo speak with an example:

[APUE exercise 3.5]./A. out> Outfile 2> 1 and./a. out 2> 1> Differences Between outfile　　Int main (){Printf ("output to stdio \ n ");Fprintf (stderr, "output to stderr \ n ");Return 1;}The result is as follows:　　Qun @ ThinkPad ~ /Tmp $./a. out> outfile

1. IntroductionThe previous section, "Lightweight Web Rich text box--wangeditor Manual (1)--Basic application" We explained how to apply wangeditor to create the most basic Rich Text editor, this section continues to talk about how to extend a simple button. This section is to continue the previous section of the content, the code used is followed by the previous

Problem description: there are now n ordered arrays in M groups, such as {1, 2, 3, 4}, {2, 3, 6}, {1, 3, 5, 7 }, select the data smaller than K in these arrays and return this value. Idea: Compare the minimum data selected each time by referring to the process of merging two Arrays

By default, there are always three files open, standard input (keyboard input), standard output (output to screen), standard error (also output to screen), and their respective file descriptors are 0,1,2. So let's take a look at the differences between the following redirection methods:>/dev/null 2>1In fact, it should be equivalent to this: 1>/dev/null 2>/dev/nul

Mac OS).Python-v(That's a capital ' V '.) If Python is installed, it prints its version number, like this:Python 2.7.1You can download and install the Python2.7 for your platform from the Python website.http://www.python.org/Make sure you get the Python2.7 version (such as Python 2.7.2) from the download area of the website. Until this book is written, Python's latest major version number is 3.2, and the latest 2.x compatible release board is 2.7.※ap

Float floating "1" clear: both clear floating; "2" set parent element overflow: hidden to clear floating, "1" and "2" Floating float Figure 1 First clear floating: add an empty element and set its css style to clear: both; Figure

We use the ubantu System for the boot and installation of Linux USB flash drives. Here we will continue to introduce the manual boot method except the self-boot method, this kind of Linux USB boot installation method requires a little more steps than self-boot installation, but it has its own. Repeat some items here. 1. Overview There is no doubt that boot from a USB flash drive is very convenient, but the

QML ranges from 1 to 2, and qml ranges from 1 to 2. As the project goes deeper, it needs to be transplanted to Android. The problem is that QML Android is compatible! Fortunately, the PC-side program is similar to the cell phone screen width ratio. Although the unit pixels and sizes are different, you can use proportio

What is a file descriptor. A file descriptor is a simple positive integer that identifies each file and socket that is opened by the process. The first three file descriptors (0,1,2) correspond to standard input (stdin), standard output (stdout), and standard error (STDERR) respectively. difference between "2>1 > File" and "> File 2>

[Go to] complete ArcGIS custom tool tutorial 1/2 I. Client -- Tag on the page:ClientAction = "EsriMapRectangle"ServerAction = "com. esri. adf. web. faces. event. ZoomInToolAction"ClientPostBack = "true"/>Ii. Client-clientActionClientAction refers to a javascript class, which must inherit EsriMapToolItem and overload several functions:Appendix 11. The first is: Object. inheritsFrom (Object parent), which is

Description defines a recursive function sumint sum (int n); function declaration, return 12+22+32+......+n2 and note: Sum is the value of the recursive function input positive integer n output12+22+32+......+n2 and sample Input5sample Output55/* Copyright (c) 2014, Yantai University School of Computer * All rights reserved. * File name: Test.cpp * Chen Dani * Completion Date: June 1, 2015 * version number: v1.0 * * #include Experience: This is a s

Would you like to send a value from PHP page 1 to 2, and then to pass 2 results back to the 1 show how to implement? Title I found the web based on HTML $_get[], this method must have a submit value, and return after the display is null Then read the net with JSON value, the result is half said JSON has double quotatio

Today in Ubuntu Kylin installed VirtualBox, and then I want to delete a new point, the result of normal situation can not be deleted, I will find the VirtualBox directory all deleted,And then through the Apt-get Remove and other commands can not be deleted, the title shows the errorChild process installed Pre-removal script returned error number 1On the internet to find a lap, a great deal of effort to find the following solutions, record,Http://www.xuebuyuan.com/2153374.htmlsudo gedit/var/lib/d

/* * Design 4 Threads 2 pairs of j-1 2 pairs of j+1 * * * * */ Class J { private int j = 0; public synchronized void Plus () {//j+ j + +; System.out.println ("+ +" + thread.currentthread (). GetName () + ":" + j); } public synchronized void minus () {//j- j--; System.out.println ("--" + Thread.CurrentThread (). G

MySql official manual Study Notes 2-MySql fuzzy query and regular expression links: MySql official manual Study Notes 1-MySql easy to use http://www.bkjia.com/database/201210/159522.html MySQL provides standard SQL mode matching and extended regular expression mode matching formats. SQL mode matching allows you to use

characters in string.P toupper (string) returns the uppercase characters in string.Cotangent (radians) of a atan (x, y) x)Cosine (radian) of N cos (x) x)X power of a exp (x) EInteger part of a int (x) xNatural logarithm of a log (x) xRandom Number between N rand () 0-1Sine (radian) of n sin (x) x)Square root of a SQRT (x) xA srand (x) initializes the random number generator. If X is ignored, system () is used ()G system () returns the time elapsed since January

Article title: Linux Network Administrator Manual (2 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Chapter 2 TCP/IP network problems We will go to discuss some of the details you will encounter. when you connect your Linu

Oracle Xe 10 Gb manual database creation for Windows XP Previous/Next Article 00:56:30/personal classification: Oracle Database notesView (376 )/ Comment (2 )/ Rating ( 1/0) WindowsUse the OMF method to manually createDatabase 1. Create a database instance named ora10g(Required only for Windows platforms, not for UNIX