linux 2 1 dev null

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For details about the/dev/null and/dev/zero files, and solutions for accidental deletion of/dev/null and/dev/zero, and the disk

For details about the/dev/null and/dev/zero files, and solutions for accidental deletion of/dev/null and/dev/zero, and the disk I/O Testing Method Using/dev/zero, disk deletion and recovery by mistake1. Introduction-explanation from

Linux-->/dev/null 2>&1

The shell can often be seen: >/dev/null 2>&1The 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 means stdout

>/dev/null 2>&1 in the shell

This article goes from http://www.kissyu.org/backgroundWe can often find such statements in a shell script >/dev/null 2>&1 . Before I did not go into the role of this command, copy replicable, until last week I wrote this order accidentally 2>&1

>/dev/null 2>&1 Detailed

Transfer from http://blog.chinaunix.net/uid-25100840-id-3271224.html a few days ago interview has such a question, more strange: Explain the meaning of >/dev/null 2>&1: I was scratching, also did not think out, wrote a clear buffer, hehe online

Linux Shell script programming -- (Linux empty device file and redirection)>/dev/null 2> & 1

Linux empty device file and redirection Output/input redirection>>>&> 2 &> 2 <>>&> & 2 File descriptor (file descriptor), which is represented by a number (usually 0-9.Common file descriptors are as follows:Default file descriptor name0 standard

Implementation principle of &gt;/dev/null 2&gt;&amp;1 in "turn" shell command

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

Linux/dev Introduction and application of common special equipment [loop,null,zero,full,random]

Linux is a file-based system, and all hardware, such as software, will have a corresponding file representation under the directory. For Dev This directory, we know the file below it, which represents the Linux device. In Windows systems, devices

Introduction and application of common special equipment for Linux dev (loop,null,zero,full,random) _linux shell

Linux is a file system, and all hardware, such as software, will be represented under the appropriate directory. For the dev directory, we know that the file below it represents the Linux device. In Windows, devices are well understood, like hard

Shell standard output error &gt;/dev/null 2&gt;&amp;1 analysis "Go" in Linux

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

Linux "&gt;/dev/null 2&gt;&amp;1 &amp;"

0: Indicates keyboard input (stdin)1: Indicates standard output (stdout), system default is 12: Indicates error output (stderr)Command >/dev/null 2>&1 & = = Command 1>/dev/null 2>&1 &1) Command: Represents a shell command or an executable program2);:

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