Kernel structure and msgget, msgctl functions of Linux System V message queues

First, Message Queuing 1. Message Queuing provides a way to send a piece of data from one process to another 2. Each block of data is considered to have a type, and the receiver process receives a data block that can have a different type value 3.

Linux Network Programming System V Semaphore (iii)

Realization of advanced first out shared memory segment based on producer-consumer model Producer consumer issues: This problem describes the two processes that share fixed-size buffers-so-called "producers" and "consumers"-that can occur when they

What are the common Linux commands?

Linux system The common commands for Linux are: echo command Example: Echo $PATH. Function: Displays the parameters in the command line to the standard output. Date command Example: Date. Function: Displays or sets the system time, does not

How to set permissions for users to access directories via SFTP on Linux

SFTP and FTP are different protocols, SFTP is an SSH-contained protocol, and as long as the sshd server is started, it is available, and it does not require an FTP server to start itself. 1. View OpenSSH software version, want to SFTP service users

Five easy HTML editors for Linux

Quanta Plus The original name Quanta is a web integrated development environment (IDE) that can be used in HTML, XHTML, CSS, XML, PHP, and other xml-based languages or scripting languages. Quanta Plus is a KDE software that is included in the

Detailed instructions on how to use the AT and ATQ commands in Linux systems

At At the specified time to execute the command. -V outputs the version number on a standard error. The-Q queue uses the specified queues. A queue is calibrated with a letter, and valid queues are calibrated from A to Z and from A to Z. The

SSH Remote Management Linux common command file upload download

First, open the main page, input host is your IP, port default 22, user default root, password see you open mail. Note that you can check the store below the password ... so that you don't have to enter the password every time: Second,

A summary of the relevant commands for Linux time settings

In a networked environment, it's a good practice to keep your Linux system time accurate. There are many services in the Linux system that require the right time to work properly under networking conditions. Let's take a look at the commands you

Linux under chkconfig command detailed

  The chkconfig command is used primarily to update (start or stop) and to query run-level information for system services. Keep in mind that Chkconfig is not immediately automatically banned or activated by a service, it simply changes the symbolic

Basic usage of the TR command to delete and replace text characters in Linux systems

By using TR, you can easily implement many of the most basic features of SED. You can see TR as a (extremely) simplified variant of sed: it can replace one character with another, or you can completely remove some characters. You can also use it to

Linux Find naming Quick search for poisoned files

Now the virus species on the computer more and more, the likelihood of encountering the virus is also more and more big, sometimes poisoning things are also impossible, this is not, today's small Linux system computer is infected with the virus,

A comprehensive analysis of the usage of the regular expressions in Linux grep commands

Linux comes with the GNU grep command tool, which supports extended regular expression extended regular expressions, and GNU grep is the default for all Linux systems. The Grep command is used to search for any information that is stored on your

Error and processing of network programming in Linux

Error number enotsock__ Socket operation on Non-socket Cause of the error: because a pair of parentheses is missing when the socket is created, the error code is as follows: if (Sockfd=socket (af_inet, sock_stream, 0) {cout return 0;}The correct

Application of caching server under Linux

Absrtact: Because the data stored by the database is more and more large, the query speed becomes more and more slow, so there is a need for Linux caching server application, this article introduces the installation of memcached and simple use. This

Tiered defense attacks on Linux servers

With the expansion of Linux enterprise applications, there are a large number of network servers using the Linux operating system. Linux server security can be more and more attention, here according to the depth of the attack on the Linux server in

Research on high availability/scalable SendMail under Linux

Server clusters running SendMail can provide high performance and high availability at competitive prices. This has always been a common practice for experienced system administrators. This article describes our research to quantify and describe

Linux and Solaris build Apache virtual Root environment (2)

4.9 Here is a small Perl script that removes most of the comments from the generated configuration file and forms a simplified file. 4.10 Giving ownership of the Htdocs directory tree to the owner of the web directory tree root# Chown-r

Discover and block system attacks in Linux environments

Attack One, When you install a Linux system on a PC, you have a powerful, advanced, multitasking network operating system. But the system is a little too powerful. Some release versions default to start many services (such as: Rlogind, inetd, httpd,

How to build a git server with Apache on Linux

Recently learning Linux, finally on Linux with Apache built a git server, this record. Server: Aliyun Server Linux version: CentOS 6.5 Apache version: apache/2.2.15 git version: Git 1.7.1 Git access mode: Basic authentication based on HTTP (non-

Linux and Windows CE network based on PPP protocol

This paper introduces the method of working together Linux host and Windows CE device through network. This article first uses the PPP protocol to establish a connection between a Linux host and a Windows CE device, and then runs an FTP server on a

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