Linux

mutual exclusion between processes, We can let these processes share a memory area (MMAP implementation) and then use some type of synchronization variable in that shared memory areaHowever, fcntl record locks are often easier to use.#include

Memcache is a high-performance, distributed memory object caching system for reducing database load and increasing access speed in dynamic applications. It is said that the official says its users, including Twitter, Digg, Flickr, and so on, are

ObjectiveOne of the most important ideas in the Linux system-"Everything is a file"-can be said throughout Linux. The general understanding of this concept of files are word,excel,txt such an editable viewable program, Linux will all the hardware

Disk Management---Creating file systems and Mounts Creating a file system Formatting[Email protected] devices]# MKFS.EXT4/DEV/SDB1Or[Email protected] devices]# mkfs-t EXT4/DEV/SDB1MKFS.EXT4 Options when formatting:-b--specifying the

Follow Marco Network full course learning routeReally start System learning Linux, a lot of chewing Linux basics650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/6F/5F/wKiom1WaRyWxQQfKAAHvgNx5TSA378.jpg "title=" Qq20150706170017.png "alt="

System Boot Process********************************************************************Firmware firmware (cmos/bios)--->post power-on self-test↓Bootloader bootloader (GRUB)---> Load kernel↓Load Kernel kernel-----> Drive Hardware↓Start the process

1.chmodFunction: Change the permissions of the fileGrammar:chmod u/g/o +/-/= r/w/x filenameExample: chmod u+wx filenamechmod g=rwx filenameR-4W-2X-1For example: rwxr-xr--corresponds to 754chmod 754 filenameFurther understanding of file

How to view the current host name:#hostname650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6F/68/wKioL1Wbhj7x68vFAAA1hRoL7xM984.jpg "title=" b_x~ W3pouehc~g{y64umn3s.png "alt=" Wkiol1wbhj7x68vfaaa1hrol7xm984.jpg "/>To modify the current

Both path and Ld_library_path are variables, and the so-called variables mean that they are assigned by others, and intuition tends to allow us to add and reduce certain paths to the variable itself, which is actually not true. The right thing to do

This article is reproduced, the original address is: http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2856901.htmlIntroductionSed is an online editor that processes a single line of content at a time. When processing, the currently processed rows

ForkWhen you run a script using fork, it is the shell (parent process) that produces a child process to execute the script when the child process finishes , the parent process is returned, but the parent process environment is not changed by the

Linux lvs DR configuration and linuxlvsdr Configuration Three servers, (1) routing, (2) (3) realserver IP Address: 192.168.196.121 (1) 192.168.196.122 (2) 192.168.196.123 (3) Install ipvsadm on (1) load banlance Machine Before installation, check

Delete unused LINUX kernel after linux update.Delete unused LINUX kernel after LINUX updateWhen I was using fredoa 21, I had to upgrade the system several times for Nic drivers without knowing it. After each startup, there were several kernels for

One linux Command every day (20): find command exec, findexec Find is a commonly used Linux Command, but we generally look for it not only, but also further operations. At this time, the role of exec becomes apparent. Exec explanation: -The exec

How to connect to a wireless network in CentOS 7 How to connect to the wireless network in CentOS 7. Although I have consulted the relevant network materials, the following content is original content, only dry goods, no nonsense. 1. Switch to the

Basic firewall operation commands in CentOS CentOS configures firewall operation instances (enable, stop, enable, and disable ports ): Note: basic firewall operation commands: Query the Firewall Status: [Root @ localhost ~] # Service iptables

Update the python version of centos and centospython. Because a later version of python is required to install a program today, you can upgrade the python that comes with the system. First, query the python version of the system. #python -V Show is 2

Linux Kernel compilation Test Kernel Compilation:Step 1: configure the kernel compilation options. make menuconfig Optional Step: exclude dependencies between compiled result files (. o. make mrproper Optional Step: Clear the Historical Compilation

Head and tail commands in linux Head syntax example tail syntax example head and tail combination usage exampleHead syntax head [-n -k ]... [FILE]... Example The first 10 rows are displayed by default. head /etc/passwd Displays the first k

Build an Apache multi-site A lamp environment is built with Apple MacBook, but a problem occurs when multiple sites are used: you don't have permission to access/on this server. After reading the information, some of them are deny problems, and some