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I read an article in the "ziqingxing" friend blog about the implementation of a mini tool called "DuplexPipe. I didn't quite understand it at first. I read the open source code and wrote it in java, a jar package. Unfortunately, I don't know much

There are three types of Message Queue operations: 1. Open or create a message queueThe kernel persistence of Message Queue requires that each Message Queue corresponds to a unique key value within the system range. Therefore, you must obtain a

Synchronization Process import subprocesscmd = ('tail', '/tmp/test.log')sp = subprocess.Popen(cmd, stdout=subprocess.PIPE,stderr=subprocess.PIPE)if sp.wait() == 0:print 'exec command succussful.'else:print sp.stderr.read() Asynchronous

The same Oracle dll script: DeclareCInt;Begin Select Count(*)IntoCFromUser_tablesWhereTable_name =Upper('Activestarttimes'); If c = 1Then ExecuteImmediate'Drop table "ACTIVESTARTTIMES" cascade constraints'; C: = 0;EndIf;

(Linuxshell) Chapter 1-test the knife (on) Source: (linux shell) Chapter 1-test tool (I) From today on, let's take a look at the book "linux shell script strategy. 1.1 Introduction A shell script is usually #! The starting text file is as follows: #!

A message queue is a linked list of messages stored in the kernel with the message queue identifier. Msgget is used to create a new queue or open an existing queue. Msgsnd adds a new message to the Message Queue. Each message includes a long type

  First, let's talk about what is I/O redirection. The so-called I/O redirection is simply a process, which captures a file, or commands, programs, scripts, even the code block output in the script sends the captured output to another file,

Recently I am studying Java Network programming. I think network programming is very interesting. So I am looking for some related information on the Internet. below is my understanding of the plug-in ., After March 1990s, with the development of

subprocess module of the Python standard library series This module allows the spawn processes, connect to their input/output/error pipes, and obtain their return codes. Examples of common methodsCall ()Executes the command and

Embedded Debugging methods:1. Simulator. For example, Qtopia core can be used to provide qvfb,arm hardware simulations using the frame Buffer Simulation tool SkyEye open source projects.2. Remote Debugging. The debugger is also on the PC, and the

Understand a dialect in the Linux Shell: 2>&12016-11-14 Du Yishu ObjectiveWhen using Linux commands or shell programming, this usage often encounters 2>&1 If it is just beginning to touch Linux, this thing really does not understand, because he has

Source: (Linux Shell) Chapter One--Small trial sledgehammer (i.)Starting today, let's study the book "Linux Shell Scripting Raiders".1.1 IntroductionA shell script is usually a text file that starts with #!, as follows:#!/bin/bashThere are two ways

This is the first programming job of the operating system principle course, which complements the functionality of the shell.The main implementation of the basic three types of commands Executable program Commands REDIRECT Command

We often need to execute a system command or script through Python, the system's shell command is independent of your Python process, each execution of a command, is to initiate a new process, Modules that call system commands or scripts through

They will discuss statements that return data, such as inserts and statements that do not return data, such as update and delete. They will then write a simple program that retrieves data from the database Execute SQL statement Now that we have a

Http://blog.chinaunix.net/uid-11848011-id-96439.html First, the overview of TCP (Transmission Control Protocol) and UDP (User Datagram Protocol is the network architecture TCP/IP model in the Transport layer layer of the two different communication

Understanding the condition variables in the thread: Recently learning the thread, learning this condition variable, it feels difficult to understand ... Read a lot of information, finally a breakthrough, now will be some of the experience to write

There are three standard input and output in Linux, namely Stdin,stdout,stderr, the corresponding number is 0,1,2.STDIN is a standard input that reads information from the keyboard by default;STDOUT is the standard output, by default output output

To execute a stored procedure in Java by using JDBC to connect to MySQL times error:16:41:16,095 ERROR [Org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (ajp--0.0.0.0-8009-3) User does not has access To metadata required to determine stored

1. PrefaceRecently, a test tool has been written that requires fast and efficient scanning of which ports are open to each server. At that time, Ping can only detect IP, determine the server network is connected, but not to determine whether the