what means wbu

standard output, but at this point the standard output is still in the terminal. The output is redirected to file after >file, but the standard error remains at the terminal.With Strace you can see:1. Command > File 2>1The key system call sequences that implement redirection in this command are:Open (file) = = 3Dup2 (3,1)Dup2 (ON)2. Command 2>1 >fileThe key system call sequences that implement redirection in this command are:Dup2 (ON)Open (file) = = 3Dup2 (3,1)Consider

0x00000000022570b8> in Desc: __main__. Desc object at 0x000000000223e208>__main__. Desc object at 0x000000000223e208> None class'__main__. Test'>Digression: Because in many cases the descriptor class still needs to know who the instance that called the descriptor is, so there is a second argument in the Descriptor class, INS, which is used to represent the class instance that called it, so t.x can see the second item in the third row in the run result as Summary Self is defined when it

Using eclipse for a long time, you start to focus on the meaning of the icon when debugging with breakpoints. This only found that the Eclipse icon is still very rich, familiar with the meaning of each icon is pretty good, especially in the breakpoint debugging. Eclipse comes with a detailed icon description, below to see how to open this description:Step one: Open Help, Tips and TricksStep Two: Open Java Development User Guide, Reference, iconsThis will allow you to see all of Eclipse's icon de

Tags: Step data scientist Architecture agreement New Hope story led meaning avoidanceWhy SQL is beating NoSQL, what this means for future data: http://geek.csdn.net/news/detail/238939 The translator notes: After years of silence, today's SQL is coming back. What's the reason? What impact does this have on the data community? Look at the analysis of this article.

function of the class module (later this idea has been confirmed by the HYY514 teacher), so they can define properties, methods and events, and in other modules called.However, compared with standard class modules, form modules and document modules cannot be instantiated as new objects as class modules, they are already instantiated objects.The document module can be seen as a Microsoft custom and embedded class module, which is a module that we manually insert (but he is an instantiated object

execute in the background.Imagine what 2>1 stands for, the combination of 2 and > represents error redirection, while 1 represents the error redirection to a file 1, not the standard output;Replacing 2>1, with 1 represents the standard output, which becomes an error redirect to the standard output.You can useLS 2>1 test, will not report the error of No 2 file, but will output an empty file 1;ls xxx 2>1 test, no xxx This file error output to 1;ls xxx

server is not currently available (due to overloading or downtime maintenance). Typically, this is only a temporary state.504 (Gateway Timeout) The server acts as a gateway or proxy, but does not receive requests from the upstream server in a timely manner.505 (HTTP version not supported) the HTTP protocol version used in the request is not supported by the server.This article is from the Linux system Learning extension blog, so be sure to keep this source http://zhangxiaoxiong.blog.51cto.com/1

G is a global matchThe middle content means: match with = switch, followed by 0 or more spaces, and then any character enclosed in double quotes, such as:= "Any symble"The= "ASFJASKLDFJASKLJDFL"= "Afasdfasdcxx"This regular meaning matches the equal sign space any quotation mark any character 0 times or multiple quotes/g means that the global match is used in JS with a similar replaceall () effect.The two st

Please explain the meaning of the code in one sentence. Header (X-Powered-By: ThinkPHP); this is a piece of code in thinkphp. I don't know what it means. please explain it. Thank you. ------ Solution -------------------- information about X-Powered-By will appear in HTTP Status nbsp; let others know that you have developed it using the ThinkPHP framework ------ the solution can explain the meaning of the c

Who knows what this code means? obj = new ex_memcache(); $this->obj->init(array('server' => $ex_memcache_server,'port' => $ex_memcache_port,'pconnect' => $ex_memcache_pconnect,'timeout' => $ex_memcache_timeout,)); $this->obj->enable || $this->obj = null; $this->__cache_type = 'Memcached'; } if(!is_object($this->obj) function_exists('eaccelerator_get') $ex_eaccelerator){ $this->obj = new ex_eaccelerator();

I just learned php. what does this code mean? These two pieces of code should be judged. It should be placed in the judgment statement, but the author of the code does not. what does it mean? In_array ($ in, $ file) ===false amp; exit ;! Ini_get ('safe _ mode' I just learned php and don't understand what this code means