Linux

Linux system calls are implemented with interruptions. linux system calls are not completed directly in the user's process space as normal function calls. They are implemented through interruptions, namely: issue interrupt + call interrupt service

There are three metric values for the process time in the unix environment: 1. Wall Clock time: regards the process execution as a black box, and the difference between the start time and end time that humans perceive. 2. User CPU time: the CPU time

In linux, configure ssh + rsync ssh remote logon sftp file sharing, similar to ftp ssh secure file transfer clientscp file sharing, similar to cp www.2cto.com ssh configuration file/etc/ssh/sshd_config # PermitRootLogin yes to no prohibit direct

The root user in Ubuntu locks the screen (password required)According to Lock screen when logged in gnome env as root, the root account cannot Lock the screen (password required) because of security concerns. It also says how to install it, however,

USB flash drive/scripts/casper-premount/2-iso_scan: line 46 can't open/dev/sr0: No Medium found, encountered this problem/scripts/casper-premount/2-iso_scan: line 46 can't open/dev/sr0: No Medium found, after checking the materials for half a day

Shell Command Execution 1. shell commands include built-in commands and external commands. Built-in commands are built-in by shell interpreter. They are directly executed by shell and do not need to derive new external commands of the process. These

Liunx Installation Summary Linux has been installed many versions over the past two days. Now let's make a summary. Install ubuntu, centos5.9, centos6.3, red hat9, And freebsd. For specific installation documents, see du Niang. Www.2cto.com has two

Linux 0.11 memory management main content. 1: memory initialization linux 0.11 supports a maximum of 16 MB physical memory. The main and mem_init functions initialize the memory. Mem_map [] is used to mark whether memory pages are occupied.

Df and du commands use common parameter df commands! The df command lists the total disk usage of the file system. du evaluates the disk usage of the file system and is often used to estimate the directory size. df parameter:-a: List all file

Add the cron settings of the self-starting task System in Ubuntu: the/etc/crontab file can be used to set the tasks scheduled by the system. Of course, you must have the root permission to edit the file. Let's open/etc/crontab to see the cron Syntax:

Ubuntu application to create a desktop shortcut 1. First method 1. install the necessary software gnome-panel sudo apt-get install -- no-install-recommends gnome-panel [python] sudo apt-get install -- no-install-recommends gnome-panel 2. start to

CentOS Server Installation notes (1) some time ago, the Department applied for two new servers and added the original old server to three servers. Boss handed me the whole task of organizing the server. I think this is not a formal employee, so I

CentOS6.3 system yum local image installation yum. conf file description [Introduction] yum is an installation and deletion program designed for the rpm system for automatic update of software packages. It automatically solves the software package

Pssh Batch Management host pssh installation: # yum install * python * # tar zxvf pssh-1.4.3.tar.gz # cd pssh-1.4.3 # python setup. py install pssh usage: 1> # Batch Execute the hostname command # pssh-h other.txt-l root-I hostname 2> # batch copy

It has been nearly a year since vim was used to summarize the use of vim, but it is always a half hour without interruption. Recently, I 've been wandering around the terminal, so I will make a summary of the simple use of vim. After all, you cannot

Create a multi-media Linux system on the Character Interface0 environment and goalHardware: One ThinkPad R52 notebook.Objective: To view images, listen to music, watch videos, and access the Internet over wireless in LINUX.1. System Installation1.1

Linux shell variable mathematical operationsAbstract:1) using the let, [], () Operators in Linux shell to operate shell variables for simple basic operations;2) use expr and bc in Linux shell to implement advanced operations;1. Basic operations on

Ubuntu-ibus installation of the Chinese Input Method Ubuntu 10.04 recently installed cannot enter Chinese. After several days of unremitting search, I finally found the following solution: First, I would like to briefly introduce Ibus, which is a

Vim configuration file 1 "do not use the vi keyboard mode, but vim's own 2 set nocompatible 3 "syntax highlighted 4 set syntax = on 5" color scheme 6 colorscheme torte 7 "removed the input error prompt sound 8 set noeb 9" not saved During Processing

Centos update source centors 1, # cd/etc/yum. repos. d2, # cp CentOS-Base.repo CentOS-Base_backpag.repo // back up the current source 3, # wget http://mirrors.163.com/.help/CentOS6-Base-163.repo // direct 163 download related source 4, # ll-rw-r --.