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Asynchronously executes exec ("/alidata/server/php/bin/php/nas/wxdoctor/index.php App/common/wordspic/user_id/". $user _info[' user_id ']." /goods_id/". $goods _id. "." /open_id/". $user _info[' open_id '].">/dev/null 2>1 "); Discuss the implementation principle of >/dev/null 2>1 in shell command first standard input, standard output, standard error: The standard input is where the program can read

Introduced /dev/shm/ is a use that isTmpfs File system device, is actually a special file system. RedhatThe default size is half of physical memory,Make time unavailableMKFSformatted. Tmpfs is a memory-based Linux/unix system. Virtualfile System. TMPFS can use your memory or swap partition to store files (that is, its storage space isVirtual Memoryin, the VMbyReal Memoryand theSwapcomposition). Thus, TMPFS primarily stores staged files. It has the fo

In the use of VUE development process, it is unavoidable to go to the local data address request, and the original configuration in dev-server.js , the new version vue-webpack-template has been deleted dev-server.js , instead webpack.dev.conf.js , so configure local access in the webpack.dev.conf.js configuration.Now we're going to use the Express in node to solve the problem of local data requests. Here ar

Think of/dev/null as a "black hole". It is very equivalent to a write-only file. All content written to it is lost forever. And trying to read content from it is nothing. However,/dev/null is very useful for both the command line and the script. Prohibit standard output. 1 Cat $filename >/dev/null2 # The file content is missing and will not be exported to stand

Use/dev/null 2>1 to do this. This command means that the standard output and error output are all redirected to/dev/null, that is, all the information that is generated is discarded. Here's a look at the difference between command > File 2>file and command > File 2>1 . The first command > file 2>file means to send the standard output information generated by the commands, and the error output information to

The default system will load/DEV/SHM, which is called TMPFS, some say with RAMDisk (virtual disk), but not the same. Like a virtual disk, TMPFS can use your RAM, but it can also be stored using your swap partition. And the traditional virtual disk is a block device, and requires a command such as MKFS to really use it, TMPFS is a file system, not a block device; you just install it and it's ready to use.TMPFS has the following advantages:1. The size o

Tags: device test redirect output redirect and color loss display function/dev/null belongs to the character special file, it belongs to the empty device, it is a special device file, it discards all the data written in it, the content written to it will be lost forever, and there is no content to read.We use the file command to see if the type is a character special file.file /dev/null/

The children's shoes, almost all because of the Xcode6 of the problem.Cause: Before Xcode6, the file system created automatically imports the Foundation.h and UIKit.h files for the user, but the latest Xcode6 only imports the Foundation.h file for the user, missing one.So, the solution is: You can import it in the header file section:#import This problem, Google a bit, found a lot.Reference: Http://stackoverflow.com/questions/26169273/cgrect-unrecogni

Today, suddenly found that git can not do anything, reported the above error, a variety of Baidu Google has not been resolved the solution. I re-installed git, restarting the computer is still not resolved, it is not the problem of git software, but a system problem.Null is a special system file that actually provides a virtual device for the operating system, and the driver for this search device is C:windows\system32\drivers\null.sysSolution:Take Wi

support). Later, the issue was resolved by turning the file into Ogg format.4. When playing audio with Soundpool, if the play function is called in the initialization, then there is no sound at all, not because there is no execution, but Soundpool needs a preparation time! 囧 Of course, this preparation time is also very short, will not affect the use, but the program runs on the play will be no sound, so I put soundpool play in the key processing, note 4 whereProbably after reading the pros and

ORACLE introduced an automatic memory management feature from the 11g version. This feature requires more shared memory (devshm ). ORACLE introduced an Automatic Memory Management feature from the 11g version. This feature requires more shared Memory (/dev/shm ). Impact of/dev/shm on Oracle 11g: ORACLE introduced an Automatic Memory Management feature from the 11g version. This feature requires more sh

Dev-CPP/mingw32 Environment Introduction (2) Review above: The above (Dev-CPP/mingw32 Environment Introduction (1) shows how to install and use Dev-CPP. In addition, I learned some usage of mingw32 and some introduction and usage of related programs. I learned some basic operations. Such as new Project Creation and project compilation. This time, we will continue

Discuss the implementation principle of gt;/dev/null2 gt; amp; 1 in shell commands. first, standard input, standard output, and standard error: standard input is the location where the program can read its input. By default, the process reads stdin from the keyboard. Standard output is the location where the program writes its output. By default, the process will... Explore the implementation principles of>/dev