Linux

When reading the Linux source code, we often find likely and unlikely, which are defined under Compiler.h.#define LIKELY (x)__builtin_expect (!! (x), 1)#define UNLIKELY (x)__builtin_expect (!! (x), 0)Here we need to first understand __builtin_expect:

Last week, a friend asked me that his company's server memory free is 0 why, the meaning is probably where the memory went, which led to a small discussion, that is, the issue of memory release ... First we may use free to see the memory usage,

Mount: Mount commandMount/dev/sda2/mnt/serverCd/mnt/serverYou cannot uninstall in the/mnt/server directory, or if you have a program that uses a disk in mount.Du-s look at the size of the folderDu-h Mark K or MUsage of DF ResourcesDf-h Mark K or MSu-

Find . -name ' file (clamp) name '-type D | Xargs RM-RF recursively finds and deletes the specified file (folder) name under the current folderGrep-ir file (clip) name. | Egrep-v ' files to be excluded (folder) name ' in the current folder (except

I have been studying Linux for half a year and I am doing exercises on a virtual machine. Later want to do on the physical machine, and do not want to kill Win7 to see some of the information so try to install the Win7 system under the installation

Create a background:Due to the operation of the server, nearly thousands of Linux servers need to be unified management, such as batch to the Linux server to execute the relevant instructions, the same time batch to the Linux server upload package,

Linux User management commands (version 2) and linux User ManagementAdd User 1. useradd-set Option username [-D view default parameters] Option: U: UID (which must not be in the system] G: Default User Group GID [preferably] G: specify multiple

[RK_2014_0929] mount a DVD source on ubuntu 14.04, rk_2014_092914.04 1. mount a DVD source in ubuntu 14.04 # Pwd/home/test # ls/home/test/ubuntustudio-14.04.1-dvd-amd64.iso   2. the URL of this article [tom-and-jerry was published at, September 2

Nagios monitors the usage of Linux system resources-about Nagios Application scenarios: both the test environment and the runtime environment require real-time monitoring programs to monitor the health status of the system (Linux Redhat). The

Ubuntu14.04-Chrome-the webpage content is displayed normally, and the Tab displays garbled code. Install Chrome in Ubuntu 14.04 and open the webpage. The Chinese text is displayed on the page. Chinese characters are garbled on the tab. As follows:

[RK_2014_0927] a simple process for compiling the Linux kernel, rk_2014_0927linux 1. simple process of Linux kernel Compilation   II. This article was published on at, in the address of [tom-and-jerry] Http://www.cnblogs.com/tom-and-jerry/p/39972

How to modify major security vulnerabilities detected by Bash in Linux: linuxbash On July 15, September 25, Beijing time, a Linux User got another "surprise" today "! The Red Hat security team found a hidden and dangerous security vulnerability in

Solution to Eclipse-4.4 crash in Debian-7.6 Today the system from Debian-7.1 to 7.6, so the trouble will come ~ The reason for eclipse-4.4 crash under the Debian-7.6 is that the current glibc library version is lower than 2.14, and many software

Upgrade glibc to 7.6 In Debian 2.15 OS environment: Debian 7.6 MySql WorkBench, Eclipse-4.4, and many other commonly used development tools require glibc version> = 2.14, while glibc In the Wheezy repository is up to 2.13. To make these tools work,

Linux practical commands I hope to help you sort out some practical Linux commands. 1. Batch killing process: Method 1: Kill-9 'ps-ef | grep java | grep-v grep | awk' {print $2 }'' Method 2: Ps-ef | grep java | grep-v grep | cut-c 9-15 | xargs kill-9

Git command parameters and Usage Details Git command (gnu interactive tools) Function Description: file administrator in text mode. Syntax: git command Note: The Git command is used to manage files. It is similar to Norton Commander in DOS and has

Linux system time and hardware time settings In Linux, there are two types of Clock: hardware clock and system clock. The hardware clock refers to the clock device on the motherboard, that is, the clock that can usually be set on the BIOS screen.

Use Chrome to run Android applications on Linux Google released a transplanted cross-border application named App Runtime for Chrome (Beta) on I/O this year, which allows Android apps to run in ChromeOS. Currently, this function is only available in

Install Mate 1.8 In CentOS 7/Debian Jessie/Debian Wheezy Mate is a Gnome 2-based desktop environment. It is a branch of Gnome 2 and is created by Arch Linux developers to provide users with a Classic Gnome Classic (Gnome 2) Desktop. Final

Centos6 system time synchronization ntpdate The newly installed linux system server may be set incorrectly. The cluster time is very important during cluster creation. It is very likely that cluster errors occur due to time. Therefore, you need to