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In the shell program, the most commonly used FD (file descriptor) is about three, respectively:0 is a file descriptor that represents the standard input (stdin)1 is a file descriptor that represents the standard output (stdout)2 is a file descriptor that represents a standard error (STDERR)In the standard case, these FD are associated with the following devices, respectively:stdin (0): Keyboard keyboard inp
[Linux exploration journey] Part 2 Lesson 1: Terminal terminal, playing a good show, lesson 1 Terminal Introduction 1. Part 2 Lesson 1:Terminal 2. Lesson
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
If there is an error during installation: The code is as follows Copy Code error:failed dependencies: Libaio.so.1 () (64bit) is needed by mysql-server-5.5.28-1.rhel5.x86_64Libaio.so.1 (libaio_0.1) (64bit) is needed by mysql-server-5.5.28-1.rhel5.x86_64Libaio.so.
network services.In view of this situation, this paper first gives the general architecture of the LVS cluster, and discusses its design principles and corresponding features; finally, the LVS cluster is used to establish scalable Web, Media, Cache, Mail, and other network services.2. General architecture of the LVS Cluster The LVS cluster uses IP Server Load balancer technology and content-based request distribution technology. The scheduler has a g
, threads 1 runs, plus 1, and saves the 1 back. At this point the value of the balance is 1, and the data inconsistency occurs when 1 of threads and thread 2 have been added 2 times. de
Document directory 0: stopped 0: downtime 1: single-user mode, only root for Maintenance 2: multi-user, cannot use net file system3: full multi-user 5: Graphical 4: security mode 6: restart actually, you can view/etc/rc. rc * in d *. d .. Init 0, the corresponding system will run, the program specified in/etc/rc. d/rc0.d. Let's take a look at the name. [Root @ localhost ~] # Ls/etc/rc. d/rc0.d rj1_k35nmb
@ CentOS ~] # Vi mysql-backup.sh notebook create database automatic backup script, as follows:#! /Bin/bashPATH =/usr/local/sbin:/usr/bin:/bin# The Directory of BackupBACKDIR =/backup/mysql# The Password of MySQLROOTPASS = ********* Replace the star number with the MySQL root Password.# Remake the Directory of BackupRm-rf $ BACKDIRMkdir-p $ BACKDIR# Get the Name of DatabaseDBLIST = 'LS-p/var/lib/mysql | grep/| tr-d /'# Backup with DatabaseFor dbname in $ DBLISTDoMysqlhotcopy $ dbname-u root-p $
to certain features, such as advanced encryption, synchronization, and additional message APIs are restricted. To use these APIs, you must receive a license from the certification center dedicated to research in motion. For more information, see the BlackBerry Application Developer guide. Volume 1: Basic Volume 2: advanced. Blackberry API packageDescription Net. Rim. Blackberry. API. BrowserApplications ca
thread 1 reads the current value 0, it is replaced by thread 2 and enters the waiting state. Thread 2 reads the current value 0, adds 1, and stores 1 back, thread 1 then runs, add 1, a
CentOS startup level: init 0, 1, 2, 3, 4, 5, 6 This is a long-time knowledge point, but I have been confused all the time. Today I am trying to understand it .. 0: stopped 1: Maintenance by root only 2: multiple users, cannot use net file system 3: more users 5: Graphical 4: Security Mode 6: restart In fact, you can v
Xception: Here we have a picture of a Scottish barrel, especially my favorite Scotch whisky, Lagavulin. Xception correctly classifies this image as "buckets".The last example is to classify using VGG16: A few months ago, when I finished the game of the Wild Hunt, I took this photo of the monitor. VGG16 's first prediction was "home theater", which was a reasonable prediction because there was a "TV/mo
line.Syntax: goto label (label is a parameter that specifies the rows in the batch processing program to be switched .)Sample:If {% 1 }={} goto noparmsIf {% 2 }={} goto noparms (if you do not understand the if, % 1, and % 2 here, skip the step first, which will be explained in detail later .)@ Rem check parameters if
MSCOMM control The MSComm communication control of VB5.0/6 provides interfaces for a series of standard communication commands. It allows you to establish a serial port connection and connect to other communication devices (such as Modem ). You can also send commands, exchange data, and monitor and respond to various errors and events that may occur during communication, so that you can use it to create full-duplex, event-driven An efficient and pract
interaction are not executed in the background, because your machine will be there to wait.However, a job running in the background will output the results to the screen, interfering with your work.If a job that runs in the background produces a lot of output, it's a good idea to redirect its output to a file using the following method:Command >out.file 2>1 In the example above,
to clear jobs that have been completed for a long time and still exist in the queue. The jobinitthread thread is used to initialize a job, which is described in the previous section. The taskcommitqueue thread is used to schedule all the processes related to the filesystem operation of a task and record the status of the task. 2.4.2 tasktracker services and threads Tasktracker is also one of the most important classes in the mapreduce framework. It runs on each datanode node and is used to sche
| off}] [Message]Sample: @ echo off/ECHO Hello WorldIn actual application, we will combine this command with the redirection symbol (also known as the pipeline symbol) to input some commands to a file in a specific format. this will be reflected in future examples. 2. @ commandThe command after @ is not displayed. In the intrusion process (for example, you can use batch processing to format the enemy's hard disk), the other party cannot see the com
requirements, use a Shell script to automate the entire backup process. [Root @ CentOS ~] # Vi mysql-backup.sh notebook create database automatic backup script, as follows:#! /Bin/bashPATH =/usr/local/sbin:/usr/bin:/bin# The Directory of BackupBACKDIR =/backup/mysql# The Password of MySQLROOTPASS = ********* replace the star number with the MySQL root password.# Remake the Directory of BackupRm-rf $ BACKDIRMkdir-p $ BACKDIR# Get the Name of DatabaseDBLIST = 'ls-p/var/lib/mysql | grep/
[Linux journey] Part 2 Lesson 1: Terminal Introduction1. Part 2 Lesson 1: Terminal 2. Lesson 2: command line, the world at your fingertips Terminal With the end of the first part, we entered the second part (small Edit
Use angularjs to develop next-generation web applications (2): angularjs application skeleton (1) 1. Call angularjs 1> load angularjs Library It can be loaded from google's CDN (content delivery network) to get fast, and it can cache script libraries between multiple applications (this method is recommended, but China
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