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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

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 f

1. The array sort method is far from being fully exploited and may be more powerful than the developers think. Many developers may feel that the sort method can be used to do this kind of thing: [1, 3, 9, 2].sort (); // return [1, 2, 3, 9] alert ([

in fact to understand the meaning of 2>1, first of all should know that Linux has three kinds of standard input and output, respectively, Stdin,stdout,stderr, the corresponding number is 0,1,2. STDIN is the standard input, the default from the keyboard to read information; stdout is the standard output, the output output to the terminal by default, that is, the monitor and so on; stderr is the standard erro

1. Physics reading (physical read) When the data block is first read, it will be cached in the buffer cache, while the second read and modify the data block in memory buffer cache The following is an example: 1.1 First read: C:\Documents and Settings\paul yi>sqlplus "/as sysdba" Sql*plus:release 9.2.0.4.0-production on Thu Feb 09:32:04 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. Connected to:Oracle9i Enterprise Edition Release

1. [Programming Questions] programming questions 1 Time limit: 1 seconds Space limit: 32768K P is a given two-dimensional set of planar integer points. Defines a point x in P, which is called "maximum" if x satisfies any point in P that is not in the upper-right area of x (the horizontal ordinate is greater than X). Find out the collection of all "maximum" points

1, stitching stringThe concatenation string is one of the most commonly used string operations and supports three ways to stitch strings in a PHP tutorial. is a dot. Delimiter {} operation, there is also a dot equals. = to operate, the dot equals sign can decompose a longer string into several lines to define, which is more beneficial. 2, replacement stringIn the language of PHP, a function named Substr_re

In the process of learning Linux, often see some terminal commands or programs have ">/dev/null 2>1" appear, because have met several times, in order to understand clearly, may wish to spend some time Baidu or Google related knowledge.0: Indicates keyboard input (stdin)1: Indicates standard output (stdout), system default is 12: Indicates error output (stderr)Com

Einstein came up with such a mathematical problem: there is a long ladder, if each step across 2, then the last one, if each step across 3, then the last 2 order, if each step across the 5-order, then the last 4 order, if each step across the 6-order, the last remaining 5 order. Only 7 steps at a time, the end is just the first order of no left. How many steps are there in this ladder? Two ways: Method

Crontab-lCrontab-eExecute */5 every five minutes * * * *Executes 0 per hour * * * *Execute 0 */2 per 2 hours * * *Executes 0 0 * * * per dayWeekly Execution 0 0 * 0Monthly execution 0 0 1 * *Annual Execution 0 0 1 1 *Asterisk (*): represents all possible values, such as the

Pre-Export command:[root@powerlong4 ~]# su - oracle[oracle@powerlong4 ~]$ ORACLE_SID=pt1;[oracle@powerlong4 ~]$ expdp \‘sys/systestpd as sysdba\‘ DIRECTORY=dir_dump_t3 FULL=YES DUMPFILE=expdpfull_pd_20150529_02.dmp......1, start importingSet up the pipeline directory on instance 2 first:[[email protected] ~]$ export oracle_sid=pt2; [Email protected] ~]$ Sqlplus/as sysdbasql*plus:Release 11.2. 0.

-2.6.828.# add Mhash to the LD library path29.[root@localhost mcrypt-2.6.8]# Export Ld_library_path=/usr/local/lib30.[root@localhost mcrypt-2.6.8]# Ldconfig31.[root@localhost mcrypt-2.6.8]#./configure32.[root@localhost mcrypt-2.6.8]# make make install33.[root@localhost mcrypt-2.6.8]# CD. 2. Download PHP and the corresponding version of PHP-FPM The code is as follows Copy Code

Sql> host CLS; 1. View the table structure sql> desc table name; For example: DESC dept; View the table structure of the Dept Department table Desc EMP; View the table structure of the EMP employee table 2. Professional Vocabulary Database: A warehouse where data is stored. Stage of data storage experience Artificial stage--long, long ago ... There is a house with a (huge) computer for scientific

Similar title: What version does jquery choose? What version of jquery do you use? jquery IE8 compatible version. What version of jquery is stable? There are currently three major versions of jquery: 1.x: Compatible with ie678, the most widely used, the official only bug maintenance, function no longer new. So for general projects, the 1.x version is available, and the final version: 1.12.4 (May 20,

_pagesize;}set {_pagesize = value;}}/**////Generate Cache Keypublic override string Getcachekey (){Const string Keyformat = "Pager-sc:{0}-fc:{1}-wc:{2}-gc:{3}-sc:{4}";Return String.Format (Keyformat, Selectclause, FromClause, Whereclause, Groupclause, Sortclause);}/**////SQL statement that generates the total number of query recordspublic string Generatecountsql (){StringBuilder sb = new StringBuilder ();S

Author: Cold Young YangTime: August 2013.Source: http://blog.csdn.net/han_xiaoyang/article/details/10515417.Disclaimer: All rights reserved, reproduced please indicate the source, thank you. Iv. Expressions and basic statements 4.1 operators and compound expressions First of all, a very important point is the precedence of the C/s + + operator, the following figure is a summary of the table, the combination of the law of the special operator has been marked with bold bold. To be honest, the ope

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 #all the numbers of 1-2+3-4+5...99 and4 """5 Assigning a value of 1,sum to start is 0, when the assignment of start is less than 100 while the loop is true6 the assignment of temp equals the remainder of start and 2, if the assig

1. FaceTime can be used for video telephony via a wireless network. Use a frontal camera for face-to-face conversation, or use a back camera to share people or things around you. To use FaceTime, you need to connect the ipad 2 to the wireless network. The contact you are calling must also have an IOS device or computer that can use FaceTime and is networked. Second Step

Departmentdao.java:Package Com.springmvc.Dao;Import java.util.Collection;Import Java.util.HashMap;Import Java.util.Map;Import com.springmvc.pojo.Department;public class Departmentdao {private static mapstatic {Depts=new hashmapDepts.put (1, New Department (1, "saledepartment"));Depts.put (2, New Department (2, "HR"));}

This article mainly introduces you on how to choose the jquery version, is 1.x? 2.x or 3.x? Before choosing to use jquery, we often consider what version of jquery should be chosen. Now what version of jquery and jquery IE8 compatible version and jquery What version of the stability of the issue, the following through this article to see the detailed introduction.ObjectiveEveryone in the choice of version,