A detailed description of the arithmetic operators for Bash programming under Linux (iii)

A detailed description of the arithmetic operators for Bash programming under Linux (iii)The shell arithmetic operation is represented as follows:1. Let arithmetic operation expressionLet c= $A + $B2. $[arithmetic operation expression]c=$[$A + $B]3,

Linux kernel Analysis week seventh-executable program loading

One, to get an executable procedure 1. preprocessing, compiling, linkinggcc hello.c -o hello.exe GCC compiles the source code to generate the final executable binaries, and the GCC background implicitly performs four stage steps.预处理 => 编译 =>

Remotely automatically back up Linux servers with seven KN storage for 7 days

Constrained by the server space, we can not be on the VPS every day to back up a new website data, one is not necessary, the second is to occupy space. Let's compromise and use the name of the week, and each backup will overwrite the same day's file

The difference between the Linux process exit--exit and return

To create a process with the fork () function, how do you terminate a process?Process exits are categorized as normal exit and exception exit:Normal exit:1). Execute return in the main () function.2). Call the exit () function3). Call the _exit ()

Linux environment variables

Bash Shell uses a feature called environment variables to store information about shell sessions and the work environment, which allows you to store data in memory so that programs and scripts running on the shell can accessIn the bash shell,

Compression zip under Linux, extract unzip command details and examples

Compression zip under Linux, unzip unzip commandI personally test the summary:Linux installation Unzip zipInstall command: Yum install-y unzip zip# Unzip Yasuo.zipMethod One:Install command: Yum install-y unzip zip1. I want to compress a file

Linux system Administrator essential monitoring tools (88 models)

With the continuous development of the Internet industry, a variety of monitoring tools are countless. Here is a list of the most complete monitoring tools on the Web. So you can have more than 80 ways to manage your machine. In this article, we

28 Unix/linux Command-line artifact (reprint)

Below are the 28 Kristóf Kovács collected under the 28 Command line tools (original link), some are familiar with, some are very useful, some are not known. These tools are very good, I hope everyone knows. This article is also discussed in Hacker

Linux Advanced Bash Programming (Process Control If-else)

One: Condition judgment if condition ThenStatements[elif condition Then statements. ..][ElseStatements ]fi Integer comparison:-lt, less than-le, less than or equal to-eq, equal to-ge, greater than or equal to-GT, greater than-ne,

Understanding Linux System Load

First, view the system loadIf your computer is slow, you might want to check to see if it's too much work.In Linux systems, we generally use the uptime command to view (W and top commands are also OK). (in addition, they are also available on

Linux under various file compression decompression (reprint)

The most common packaging program under Linux is tar, which is often referred to as the TAR package, and the tar package file commands are usually terminated with. Tar. After the tar package is generated, you can use other programs to enter theRow

Construction of SendMail under Linux system

Learn bird brother Linux private cuisine obtainedSendMailYou can use the Rpm-qa |grep sendmail to see if SENDMAIL-CF and SendMail are installed if the Yum-y install SENDMAIL-CF installation is not installed(Note: After self-test, found that the

(OK) Linux Epoll model-socket epoll Server Client Chat

Http://www.cnblogs.com/venow/archive/2012/11/30/2790031.htmlhttp://blog.csdn.net/denkensk/article/details/41978015Definition:  The Epoll is an enhanced version of the Linux kernel for processing large numbers of handles and is a poll of the Linux

(OK) Linux Epoll model-socket epoll Server client Chat-pthread

Http://www.cnblogs.com/venow/archive/2012/11/30/2790031.htmlhttp://blog.csdn.net/denkensk/article/details/41978015Definition:  The Epoll is an enhanced version of the Linux kernel for processing large numbers of handles and is a poll of the Linux

"Linux kernel design and implementation" Reading notes Chapter III

Chapter 3rd Process Management 3.1 process1. ProcessProcess is the procedure that is in the execution period.Processes include: Executable program code Open a file Suspended signal Kernel internal data Processor

A gadget that displays IP geolocation information under Linux-nali

A gadget that displays IP geolocation information under Linux-naliFirst, IntroductionNali, the name is taken from the Chinese "where" pinyin. Nali contains a set of command-line programs whose main function is to attach the IP strings of the output

Description of the notes process for the sixth week of the Linux kernel analysis and the creation of the process

Description of the process and creation of the processI. Description of the process1. Process descriptor TASK_STRUCT Data structure (i)The three main functions of the operating system: Process Management (CORE), memory management, file

Linux block device driver (iv)--Simple Sbull instance

#include #include #include #include #include #include #include #include #include #include / * size_t * /#include / * O_accmode * /#include / * Hdio_getgeo * /#include #include #include #include #include / * Invalidate_bdev * /#include

28 Unix/linux Command-line artifact

Below are the 28 Kristóf Kovács collected under the 28 Command line tools (original link), some are familiar with, some are very useful, some are not known. These tools are very good, I hope everyone knows. This article is also discussed in Hacker

Linux Chown (Change the owner of the specified file to the specified user or group)

Chown the owner of the specified file to the specified user or group, the user can be either a user name or a user ID; a group can be a group name or a group ID; a file is a space-separated list of files to change permissions, and wildcard

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