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1. system environment variables after the user logs on to the system:$ HOME user's own directory$ PATH: the directory to be searched during Command Execution$ TZ Time Zone$ MAILCHECK the number of seconds to check whether a new letter exists$ PS1

1)/proc/sys/vm/block_dumpThis file indicates whether block debug mode is turned on to record all read-write and dirty block writeback actions.Default setting: 0, disable block debug mode2)/proc/sys/vm/dirty_background_ratioThis file represents the

[From] http://blog.chinaunix.net/uid-168249-id-2860686.html Reference: 1. system environment variables after a user logs on to the system:$ Home user's own directory$ Path: the directory to be searched during Command Execution$ TZ Time Zone$

Cacti uses snmpget to obtain data and uses rrdtool to draw images. In addition, you do not need to understand the complex parameters of rrdtool. It provides powerful data and user management functions, allowing each user to view the tree structure,

#### Close Service Timeservermaster = "192.168.6.13" Sshport = "58522" Echored () { Echo-ne "\ 033 [31 m" $1 "\ 033 [0m \ n" } Echogreen () { Echo-ne "\ 033 [32 m" $1 "\ 033 [0m \ n" } IPN = 'ifconfig | grep 192.168 | awk '{print $2}' | cut-D:-F2

Configure the red dot key Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->sudo gedit /usr/lib/X11/xorg.conf.d/20-thinkpad.conf Add the following Configuration: Code highlighting produced by

Copy the following file to a text file and name it "enable LAN sharing (access to the local computer without verification). Reg" **************************************** ************************** Windows Registry Editor Version 5.00

Enable LAN sharing (enter the user name and password to access this host). cmd CopyCode The Code is as follows: @ echo off @ Echo. @ Echo. Description @ Echo -------------------------------------------------------------------- @ Echo after this

After sorting out a Windows batch file, 8 steps are required. Echo off REM reference: http://book.51cto.com/art/201004/192440.htm pushd "E: \ OpenSSL Certificate Management \" Echo. echo 1. creates a random number. rndopenssl rand-out. RND 1000:

#! /Bin/bashDev = "tun0"Uplink ink = 300# About half of the downstream downlink 3200 K, so as to get more concurrent connectionsDownlink = 2048VIP1 = "192.168.1.159/32"VIP2 = "192.168.1.163/32"# Two VIP usersEcho "===============================

[2014] [Xin Xing] [php] [Autumn] [2] The first php program, 2014 Xin Xing ******************* set the server ************** 1. this interface is in English by default, but wamp has built-in Chinese support. You only need to set it. Right-click the

Bash Shell and bashshellI,Terminal Printing [Root @ cai ~] # Echo welcome to bash! Welcome to bash!   [Cairui @ cai ~] $ Echo 'Welcome to bash! ' Welcome to bash!   [Cairui @ cai ~] $ Echo "welcome to bash \! " Welcome to bash \! (Note: special

Linux scheduled task and Linux task  Crond of scheduled tasks Crond is a service or software used in linux to regularly execute commands/scripts or specify program tasks. Generally, after installing Centos5/6 linux, by default, the Crond task

Introduction to shell and introduction to shell Models 1) DescriptionThe shell file suffix is sh, which can be understood as writing multiple commands to one file. As long as the shell file is executed, many associated operations can be performed,

Basic shell syntax and shell syntax I. Variables 1. Naming rules for variables: The name should start with a letter or underline followed by numbers, letters or underscores. It is best not to name it casually, so that you can see the variable name

Use makeself to create an installation file Makeself.shis a small shellscript used to generate a self-decompressed tar.gz compressed package from a directory. The result file is displayed as a shell script (most with. run as the suffix) and can be

VMware system clone and vmware cloneChapter 2 setting up a VMware environment 1st vmware Host Configuration-network configuration 1.1.1 adding Nic information to a VM (5) A. Right-click the VM and choose "Settings"> "add virtual Nic hardware device "

Centos Optimization after minimal installation Clear automatically started services Displays the startup status of all running levels of all services# Chkconfig-listStop all services started on running level 3# For oldboy in 'chkconfig-list | grep 3:

Set up ntp time server and ntp Time Server    Chapter 1 Introduction to ntp1.1 ntp NTP(Network Time Protocol) is a Protocol used to synchronize Time between computers in the Network. Its purpose is to synchronize the computer clock to the

Simple CentOS Optimization During the O & M work, we found that the Linux system cannot be immediately put into the production environment after installation, which usually requires optimization by our O & M personnel. Next, I will briefly explain