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Today in one of their technical group was asked such a question, and then the popular explanation, make a record, we see whether the explanation is clear! The shell may often see: >/dev/null 2>1 The results of the command can be defined in% > to define the output Decompose this combination: ">/dev/null 2>1" is part of five. Where 1:> represent redirects, such as echo "123" >/home/123.txt 2:/

/dev/null : Represents an empty device file> : Where does the delegate redirect to, for example: echo "123" >/home/123.txt1 : Indicates stdout standard output, system default is 1, so ">/dev/null" is equivalent to "1>/dev/null"2 : indicates stderr standard error : Means equal to, 2>1, 2 output redirect equals 11. Prohibit standard output>/

Elevation of permission for devices read/dev by Android applications (2)In privilege escalation for devices in/dev for Android applications (1), two methods of privilege escalation are briefly summarized: Device_initAnd Init. RC. In this article, I will summarize in detail that it is easy to confuse people without being careful. Init. c, Device_initAnd Init. RCHow do they work. Directory structure ls: Syst

[From] http://www.ixdba.net/a/ OS /linux/2010/0422/35.html Shell may often see:>/dev/null 2> 1 Command results can be defined in the form of %> Break down this combination: ">/dev/null 2> 1" is five parts. 1:> indicates the redirection location, for example, echo "123">/home/123.txt2:/dev/null indicates that the device file is empty.> Indicates stderr standard

In linux, the/dev/shm system loads/dev/shm by default. it is called tmpfs. some people say it is different from ramdisk (virtual disk. Like a virtual disk, tmpfs can use your RAM, but it can also use your swap partition for storage. And traditional virtual magnetic... In linux, the/dev/shm system loads/dev/shm by defa

Break down this combination: ">/dev/null 2>1" is part five.(1 for standard output, 2 for standard error output, 2>1 to redirect standard error output to standard output)Where does the 1:> delegate redirect to, for example: echo "123" >/home/123.txt2:/dev/null represents an empty device file3:2> indicates stderr standard error4: means equal to, 2>1, 2 output redirect equals 15:1 means stdout standard output,

Drivers/tty/serial/Samsung. c Int s3c24xx_serial_probe (struct platform_device * Dev, Struct s3c24xx_uart_info * info){Struct s3c24xx_uart_port * ourport;Int ret; Dbg ("s3c24xx_serial_probe (% P, % P) % d \ n", Dev, info, probe_index ); Ourport = s3c24xx_serial_ports [probe_index];Probe_index ++; Dbg ("% s: initialising port % P... \ n", _ FUNC __, ourport ); Ret = s3c24xx_serial_init_port (our

Use Webpack-dev-server to encounter problems that cannot be automatically refreshed by the browser;Here are some points to note:1.webpack-dev-server does not read the configuration of your webpack.config.js output!!You're in webpack.config.js. The configuration output property is used when you use Webpack to pack, and it doesn't work for webpack-dev-server.2.webp

The shell can often be seen: >/dev/null 2>1Eg:sudo kill-9 ' ps-elf |grep-v grep|grep $1|awk ' {print $4} ' 1>/dev/null 2>/dev/nullThe result of the command can be defined in the form of a%> output/dev/null represents an empty device fileWhere does the > delegate redirect to, for example: echo "123" >/home/123.txt1 mean

KOA2 for easy Webpack-dev-server Thermal update Original HTTPS://GITHUB.COM/ZHUANGZHOU/BLOG/ISSUES/3 Idle to Nothing, with koa2 a simple webpack-dev-server, in fact, many online Express build hot update, but koa2 few; Welcome to the big guy to shoot bricks and enlighten;Source Configure the basic Webpack1. Download the installation package Webpack Webpack-cli Ht

From: http://www.ixdba.net/a/os/linux/2010/0422/35.html "When reprinted, please indicate the source of the article and the author's information and this statement in the form of a hyperlink"Original link: http://www.ixdba.net/a/os/linux/2010/0422/35.html Today in one of their technical group was asked such a question, and then the popular explanation, make a record, we see whether the explanation is clear.The shell may often see: >/dev/nu

Data Analysis system DIY three tasks to complete.First, use VMware to install 64-bit CentOS. The database service side with CentOS comes with the good.Second, data collection and pretreatment with dev-c++ programming solution.Third, using the local Win7 64 matlab r2012b Connection database for mining analysis.This article is the process of completing the second task.1.Terminal Enter the command line "Ifconfig" to confirm the CentOS virtual machine ip:

Transferred from: https://github.com/GoogleChrome/chromedeveditor/blob/master/doc/GettingStarted.mdInstallation Install Chrome Dev Editor on Chrome Open Chrome Dev Editor from the chrome App Launcher or Chrome://apps Git Workflow Click on the Menu icon and select Git Clone ... provide the Repository URL (EG:NBSP;HTTPS://GITHUB.COM/SRSAROOP/TODOMVC) click CLONE

What the hell is/DEV/KVM?1./DEV/KVM device is a device file that comes out of a KVM (kernel-based virtual machine) VM2. Speaking of KVM, we have to mention that Qemu,qemu is a simulation software that runs on Linux user space. QEMU can simulate all the operating systems we can see, such as simulating Andrio,ios on the x86 platform, and, of course, simulating windows,linux (GNU), BSD. Because of the simulati

In Linux,/dev/loop is often used to create the file system image file rootfs. IMG, so that it can be downloaded to the kernel for mounting; Http://zh.wikipedia.org/wiki//dev/loop We have daily access to a large number of image files *. ISO, which use data files to store data on actual block devices; First of all, you must make it clear that you need a specific file system to store files on devices such as C

What is the difference between echo and/dev/null in command for clearing file content? We know that there are many methods to clear the file content. This article only talks about the differences between echo "And/dev/null. 1. What is the black hole device/dev/null? In Linux, the null device is basically used to discard output streams that are no longer needed

Using/dev/zero to create a virtual hard disk/dev/zero is a special device in Linux, each time you read it, It outputs a byte (all of them are "0" in the editor). Now we can create a 10 m data file, then run the file command to view [root @ xx ~]. # Dd if =/dev/zero of = hd. img bs = 1 k count = 10000 [root @ xx ~] # File hd. img the file command hd. img is a data

Webpack-dev-server Remote Access configuration method, The webpack-dev-server configured in the package. json file below is the Development Mode. You can use http: // localhost: 8080 or http: // 127.0.0.1: 8080 for access. "Scripts": {"dev": "cross-env NODE_ENV = development webpack-dev-server -- open -- hot", "build

Review above:In the above section, we mainly introduce how to create a custom project in Dev. The structure of the package is briefly introduced later. Next I will complete the preparation of the package. Chapter 2 Dev-CPP package preparation First, let's take a look at the dev-CPP package. The Dev-CPP package has

Recently, the company has never been able to do anything, so it began to visit the forum to pay attention to some things. I accidentally saw the information about the android game engine, so I started to learn OpenGL with a whim. I personally think this should be a foundation for learning the game engine. Recently I was reading the C programming language, so I plan to start learning OpenGL from the C language. Maybe Java has been doing for a long time, especially do not like Microsoft's develop