1, need to install before installationYum install-y libpcap libpcap-develIf the Yum tool is not installedYou need to use RPM to install the following packages[Email protected] arp-scan-1.8]#Yum List|grep libpcapLibpcap.i386 14:0.9.4-15.el5 Installedlibpcap.x86_64 14:0.9.4-15.el5 InstalledLibpcap-devel.i386 14:0.9.4-15.el5 Installedlibpcap-devel.x86_64 14:0.9.4-15.el5 installed2, download packagewget http://www.nta-monitor.com/tools/arp-scan/download/arp-scan-1.8.tar.gz 3, compiling the packageTa
working memory. So when thread 2 changes the value of the stop variable, but it has not been able to write it into the main memory, thread 2 is re-running to do other things, because thread 1 does not know the changes to the stop variable of thread 2, it will keep repeating.However, modified with volatile will become different:If the volatile keyword is used, the modified value is immediately written to the primary storage. If the volatile keyword is used, when thread 2 is modified, the cache r
Document directory
MySciprt. pl (an example using MyModule)
Zz from http://fanqiang.chinaunix.net/program/perl/2005-06-28/3349.shtml
Do you think the module documentation in perl is difficult? Okay, here is the simplest module in the world. It will be used to demonstrate all the features of the (demonstrate) Exporter module. There is also a script for using this module. At the same time, we will also provide a brief description of @ INC. Finally
Do you think the module documentation in Perl is somewhat difficult? Okay, here is the simplest module in the world. It will be used to demonstrate all the features of the (demonstrate) Exporter module. There is also a script for using this module. At the same time, we will also provide a brief description of @ INC. Finally, we will also talk about the use of using warnings and use modules.
The content of this module is as follows: Mymodule. PM
\companies.txt ', ' + ') >>> f1.write (' \ n ') >>> f1.write (' Alibaba ') >>> f1.seek (0,0) >>> l=f1.readlines () >> > f1.close () >>> l [' Apple inc.\n ', ' Google inc.\n ', ' facebook,inc.\n ', ' Microsoft corporation\n ', ' a Libaba ']
3 Opens the file Companies.txt, after the second line, adds an independent new line ' Love Python '.>>> F=open (r "C
Introduction: This is a detailed page for PHP user authentication and Management (full version). It introduces PHP, related knowledge, skills, experience, and some PHP source code.
Class = 'pingjiaf' frameborder = '0' src = 'HTTP: // biancheng.dnbc?info/pingjia.php? Id = 323747 'rolling = 'no'>
User Authentication and Management (Full Edition)
Author: Max-- Begin Auth. inc --
$ Id = "xxxcom ";
If (! Isset ($ php_auth_user )){
Header ("w
://blog.cncms.com/
2. reg. php registration File (for instructions)
Require_once ("inc/xajax. inc. php ");// To use xajax, you must first introduce xajax. inc. php$ Xajax = new xajax ("inc/signup. php ");// Create an xajax object named singup. php$ Xajax-> registerFunction ("processForm ");// Use the processForm func
platinum pt ($ sJS)
Execute a js segment
3. $ objResponse-> addAssign ("","","")
Attaches a value to an element on the page or modifies its attributes.
And so on ....
Therefore, xajax is not dead. it cannot provide the XXX function, but it can flexibly control the js/vbs of the client to achieve the desired effect.
III. xajax installation and configurationNo special installation or configuration is required. you only need to download the package and decompress it to the website directory.
:
active. It can be said that xajax alone can be used, but nothing can be done with js/vbs.Xajax mainly uses the xajaxResponse class, which provides some methods, for example:1. addAlert ($ sMsg)Pop-up warning2. addscr platinum pt ($ sJS)Execute a js segment3. $ objResponse-> addAssign ("","","")Attaches a value to an element on the page or modifies its attributes.And so on ....
Therefore, xajax is not dead. it cannot provide the XXX function, but it can flexibly control the js/vbs of the client
. phpMyAdmin installation
Step 1: extract phpmyadmin-3.3.3-all-languages.zip to/apache2/htdocs/, create a phpmyadmin folder, and put the compressed file in it to complete installation.
Step 2: configure the config in the top-level directory of phpMyAdmin. inc. php. config does not exist by default. inc. php file, we need to manually create one, you can also copy config. sample.
://blog.cncms.com/
2. reg. php registration File (for instructions)
Require_once ("inc/xajax. inc. php ");// To use xajax, you must first introduce xajax. inc. php$ Xajax = new xajax ("inc/signup. php ");// Create an xajax object named singup. php$ Xajax-> registerFunction ("processForm ");// Use the processForm func
Threads can improve the efficiency of the program in some way (concurrent execution, saving time.) ), but it also produces some side effects (data dirty read, deadlock).Data dirty reading can be controlled by synchronous technology, and deadlock is resolved by convention.Class increment//synchronization to resolve dirty reads{private int n = 0;private int Max;Public Increment (int max){This.max = max;}public int Result{Get{return n;}Set{n = value;}}public void
command import time, OS def re_exe (cmd, inc = 60) at the required time interval: while True: OS. system (cmd); time. sleep (inc) re_exe ("echo % time %", 5)5. scheduled tasks
#! /Usr/bin/env python # coding = UTF-8 # Here we need to introduce three modules import time, OS, sched # The first parameter to determine the task time, returns the number of seconds that have elapsed since a specific time # The se
Original URL: http://blog.csdn.net/trochiluses/article/details/9048539default value (:-)If the variable is followed by a colon and a minus sign, then the variable is followed by the default value of the variable.$ company=$ printf "%s/n" "${company:-unknown Company}"Unknown CompanyThe actual value of the variable can remain unchanged.Colons can also be omitted without:$ company=$ printf "%s/n" "${company-nightlight Inc"$Specify default value (: =)If t
C # Hill Sort
The hill sort is to insert the component segments into the sort.
using System; namespace ShellSorter { public class ShellSorter { public void Sort(int [] list) { int inc; for(inc=1;inc<=list.Length/9;inc=3*inc+1); for(;in
value is greater than the current counter value of the table, the counter value of the table is set to this value.
When inserting data, if the value of the specified auto_increment column is NULL or 0, mysql will allocate a value to the column from the counter, just like the value of this column that you did not specify. if the value of the specified auto_increment column is a negative number or exceeds the maximum value that the column can store, this behavior is not defined in mysql and may c
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