Linux

Shared memoryShared memory is a portion of physical memory that is shared by multiple processes. Shared memory is the quickest way to share data between processes, where a process writes data to shared memory, and all processes that share that

TCP/IP three-time handshake process for establishing a connection :A total of three packet are required to establish a TCP connectionclient--> syn=1 , Ack=0,fin=0---Serverclient , ack=1,fin=0 client--> syn=0 , Ack=1,fin=0---ServerTCP/IP Four

Linux Command Tools Top The top command is a common performance analysis tool under Linux that shows the resource usage of individual processes in the system in real time, similar to the Task Manager for Windows. Top is a dynamic display process

Partitioning is an important prerequisite for installing Linux, and if the partition is not planned at the time of installation, it will bring a lot of trouble to the daily operations.Usually we divide the following disk blocks: / /boot

http://www.ibm.com/developerworks/cn/linux/l-cn-udev/[Email protected] ~]# uname-r2.6.32-431.el6.x86_64Udev-147-2.51.el6.x86_64This version of Udev changes significantlyWhat is Udev?Udev is a feature in the Linux2.6 kernel that replaces the original

I. Overview of interprocess communication:1. Purpose: Why do interprocess communication?1) Data transfer: One process needs to send his data to another process.2) resource sharing: coordinating shared resources.3) Notification event: A process needs

First, create the syntax:ln [options] Existingfile NewFileln [options] Existingfile-list DirectoryCreate a soft link with-s without creating a hard link with-S.-F is created, it is deleted with the file name.-I ask before deleting.Second,

 The various environment variables under the Linux system are implemented by modifying the/etc/profile file. Because it is a system file, you need root permission to modify this file. Therefore, the user must have root privileges to implement the

Terminal most common shortcut keysNew terminal window: crtl+shift+nTerminal Drift/Toggle:shift+ left and right arrowsPending:Crtl+sLift pending:crtl+qClear screen : Crtl+lCommand line cursor movement:　　crtl+a Move to the beginning of the

User ManagementDifferent users of the online server are responsible for different parts, such as architecture engineers need web-related permissions, and DBAs need database-related permissions. Coordinate availability and security, how do I manage

#! /bin/shA= "/usr/share/tomcat7/webapps/root" b= "/usr/share/tomcat7/webapps/root.war" c= "Root.war" tomcat_stop= "/usr/share/ tomcat7/bin/shutdown.sh "sh" $tomcat _stop "PS Aufx | grep Tomcat | grep root | awk ' {print $} ' | Xargs Kill-9rm-rf/usr/

Download their corresponding version first (tar.gz)Then extract to usr/local/.Command: TAR-ZXVF ... tar.gzConfiguring the JDK environment variablesCommand: Vi/etc/profile#set Java EnvironmentJava_home=/usr/local/jdk1.7.0_60Classpath=.: $JAVA

 Under the Linux operating system, almost all of the software is installed, uninstalled and managed through RPM. RPM is all called the Redhat Package Manager, and is a software proposed by Redhat Corporation to manage packages under Linux. Linux

[email protected] ~]# RPM-QF/SBIN/IPiproute-2.6.32-31.el6.x86_64IP is a command, there are many functions of IP command! Basically, it integrates the two commands of Ifconfig and route.Ip-show/manipulate routing, devices, policy Routing and

Install and update libraries using external devices (optical drives) and linux external devices1. Mount the optical drive (the directory does not exist, create)Mount-t auto/dev/cdrom/mnt/cdrom2. Modify the index file to read the local

In linux, view and terminate processes. In linux, terminate processes.1. Check which process occupies the port. Example: netstat-anp | grep 1160 Ps: Check that port 1169 is occupied by that process. 2. Search for processes Example: ps-ef | grep

Bind the ip address and host name in Linux. 1: Enter the command gedit/etc/hosts In this way, you open a text and add the following content at the end of the text: IP address Host Name 192.168.0.125 hadoop Save and exit. How to resolve a linux

Use SHELL scripts to implement the file integrity check program, I. Development Background As a result of the current situation, you need to monitor the file system of the server. Although there are many intrusion detection and anti-tampering

This chapter -- the tool used to send and receive emails is Thunderbird.   Install # Yum install dovecot-mysql.x86_64 dovecot. x86_64-y Edit File Vim 10-mail.conf Mail_location = maildir:/home/vmail/% d/% n/Maildir/first_valid_uid = 800 Enable !

Applications of the kernel linked list and applications of the kernel linked list This article builds a two-way circular kernel linked list, then traverses the linked list, prints data, and finally releases the linked list node. The data structure