Linux

Purpose of inter-process communication Data exchange State synchronization Event notification Resource sharing Process Control In general, the communication between processes can be divided into two types, one is

command to change permission properties chmod chmod is a command to change the permissions of a file or directory, but only the owner and Superuser root of the file has such permissions, there are two ways to change the permissions of a file or

Environment description IP programs that need to be installed 192.168.209.12 Nginx MySQL PHP *LNMP The installation of the schema *① install Nginx② install Mysql③ install Php④ last

What is history? ? In the cumulative use of Linux systems, we will enter many commands. And when we want to repeat the last command, we can view the commands we have entered and used by using the arrow keys to flip up. Have you ever thought about

Http://www.cnblogs.com/kerrycode/p/4723637.htmlYum is the abbreviation for Yellow Dog Updater modified, originally developed by the developer Terra Soft, a release of Yellow Dog, written in Python, then called yup (Yellow Dog Updater), followed by

First unitIntroduction to Computer operating systemsWhat is the operating systemWhat is the kernel of the operating systemTwo operating system user interfacesPreparations for installing the Linux operating systemLinux distributions (CENTOS, RHEL,

1. First, create the file as a mount pointmkdir/File name/2.mount/iso/rhel-server-7.3-x86_64-dvd.iso/dir/Mount the image under the/iso directory on the/dir/file 3. cd /etc/yum.repos.d/ 进入文件4. rm -fr *

SedSed means the stream editor, which is commonly used as a filter in shell scripts and makefile, which introduces the output of the previous program to the input of SED, which is converted to another format output through a series of editing

The expect command, a language based on TCL, has the same intrinsic principle as the early chat;is a tool for automating the interaction between users and programs.First, expect grammatical composition:Expect can write a separate

A: What is RABBITMQ?As a Windows loyal user, we have to mention a service that comes with Microsoft's own msmq,windows, and the message is stored in the file system, which is the most primitive messages queue.Today's distributed and message

1. Application scenario, build Sam shared directoryAvailable for Linux and between Windows 2. Server ip:192.168.56.11 (A)Client ip:192.168.56.133 (B) View firewall status and close[[email protected] ~]#systemctl status

1th. What is a regular expression Regular expressions are a set of rules and methods that are defined to handle a large number of text | strings By defining the assistance of these special symbols, the system administrator can quickly

Before discussing disk and file system management, we have a simple understanding of the following disk structure: 1) platters, that is, the portion of the recording data, the number of the same as the number of heads, 2) the head, read and write

First, when installing 2 tomcat on a server, modify the port number of the Server.xml file in the second Tomcat's Conf directory (original 8080 to 8081, original 8005 to 8006) can be up to two tomcat can be started and the port does not conflict

Linux 16th Day Self-study package management Time: 20180802DirectoryLinux Package ManagementRPM Package Management tool usesYum Online Package management toolSource Code Compilation InstallerLinux Package ManagementMost of the software on Linux is

Types of compression and decompression files commonly used by Linux:. tar,.gz,. tar.gz,.bz2,. tar.bz2,.z,. Tar. Z,.zip,.rar and so on.Linux commonly used compression and decompression commands are: Tar,gzip, GUNZIP,BZIP2, bunzip2,compress,

Lab environment: CENTOS7 virtual MachinesFirst create a normal user gubeiqing .[[email protected] ~]# useradd gubeiqing[[email protected] ~]# passwd gubeiqingChanging password for user gubeiqing.New password:BAD PASSWORD: The password is a

Problem: When you encounter a scene at work, you need to automatically sync the files on your Linux machine to your Windows machine on a daily schedule.The solution has two:1, set up the shared directory on the Windows machine, then mount the shared

In this example, a character device is used. The device applies for a piece of memory, and file_operations has the MMAP function. In test. C, the MMAP memory can be modified by operating the user memory. Driver code mmap_demo.c #include #include

Signal Concept The signal is software interruption. It can be used as a mechanism for inter-process communication. More importantly, the signal always interrupts the normal operation of a process and is more used to handle abnormal situations. The