Linux

In the performance optimization of network applications on Linux, TCP-related kernel parameters are generally adjusted, especially the parameters related to buffering and queuing. The articles on the Internet will tell you what parameters you need

The so-called process control is that the system uses a number of specific functions of the program to create processes, undo processes, and complete the process of transitions between various states,so as to achieve multi-process efficient

Whether the allocation is fast or slow, the actual allocation of memory is the Buffered_rmqueue () function, the other is to choose from where to allocate more appropriate;Let's talk about each parameter first:The struct zone *preferred_zone

Students who use Linux or UNIX systems may not be familiar with the #! symbol, but do you really know it?This article will give you a brief introduction of Shebang ("#!" ) This symbol.First, the name of this symbol (#!) is called "Shebang" or

You can do a couple of things for avoiding. Setting the DEBIAN_FRONTEND variable to and noninteractive using -y flag. For example:export DEBIAN_FRONTEND=noninteractiveapt-get -y install [packagename]If you need to the install it via sudo, use:sudo

The executable permission of the directory indicates whether you can execute commands under the directory. If the directory does not have the-X permission, you cannot execute any commands on the directory or even CD into the directory. Even though

Unable to modify Linux password Authentication token manipulation Error Problem resolutionNote: I encounter the same problem, the use of 7-8 step OK.Passwd:authentication token manipulation error When a colleague modifies the Linux root passwordThe

1.ls [Options] [Directory name | list all directories and files in the relevant directory -a lists all files that contain a hidden file that starts with a. A-a , but does not list "." and ".." -L list File details-c sort by CTime show-t sort by

MV with rename functionIn the same directoryMV File1 file2 File1 renamed to File2MV File1/home/file1 is moved to the/home directoryMV File1/~ When the target directory does not exist, the file is moved to/directory and renamed to ~[note] Important

Linux io Scheduler (Linux IO Scheduler)Each block device or partition of a block device has its own request queue (request_queue), and each request queue can select an I/O Scheduler to coordinate the request submitted . The basic purpose of the I/O

exit is a function that has parameters. void exit (int status). leave control to the system after exit executes. Return is returned after the function has finished executing. After the return executes, give control to the calling function.

Introduction to the installation and use of Git on Linux  git was originally distributed version control software created by Linus Benedict Torvalds for more efficient management of Linux kernel development, unlike common version control tools such

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,

Most of the time, we will find that a process is reading and writing to the current file, but we still can RM, is it strange? And under Windows, there will be an error, "The current file is being used", which has to be removed from the Linux under

Linux in the system cp (copy) the command is used to copy files or directories. Man CP can get CP a detailed description ofCommand format:CP [OPTION] ... [-T] SOURCE DEST//CP [ options ] ... [-T] Source PurposeCP [OPTION] ... SOURCE ...

I. Content analysis1. Creation of executable files(1) pretreatment stageThe preprocessing process reads the source code, examines the statements and macro definitions that contain the preprocessing directives, and transforms the source code

Install the Resource Manager software Double Commander in Ubuntu 16.04 Double Commander is a good file manager that can greatly improve the efficiency of using computers. Double Commander is a free and open-source Resource Manager software similar

Linux-Raspberry Pi system partition There are two main partition commands: fdisk and parted.Both commands require the root permission,First, we will introduce the fdisk command: Fdisk allows you to view the usage of the current file system. fdisk -l

Nmap help documentWhat is nmap? Nmap (Network ER) is an open-source Network detection and security audit tool. Its design goal is to quickly scan a large network. Of course, it is no problem to scan a single host with it. We recommend that you use

IDE introduction and simple use of Eclipse I. IDE Introduction ① What is IDE? 1. The full name of IDE is "Integrated Development Environment "; 2. It is an application used to provide a development environment. It generally includes code editor,