Usage of srand () and time functions in Perl

In Perl, srand () provides the random number seed for rand (). Rand () generates the random number generator.If srand () is not called before rand () is called for the first time, the system automatically calls srand () for you ().Calling srand ()

[Zz] automatic conversion between Perl numbers and strings

Http://developer.51cto.com/art/201007/211617.htm This article will focus on the automatic conversion between Perl numbers and strings in the Perl language. Here we will introduce them from seven aspects, I believe you have learned a little

Perl's getopt: Long and POD: Usage

Code: Variables need to be explicitly defined and initialized. For example, optionx. If no variables are defined and explicitly initialized, and no options are specified on the command line, the variables corresponding to the options are

Perl constants + multi-dimensional arrays + variable Initialization

Code:   Use Strict; Use Warnings; My $ Test="ASDF";Print "$ {Test} _ Test2 \ n"; #ConstantUseConstant {AAA =>"Aaa",Bbb =>"Bbb",Min_total =>12,Score_pass =>90,Score_red =>70,}; PrintAAA;PrintScore_pass; # Two dimesion Arrays My @

Perl-CGI Basics

Code: Http: /xxxxx/cgi/perl-cgi.cgi? Name = itech & url = itech.cnblogs.com & p1 = test1 # ! /Usr/bin/perl-WT# Shoshould use strict and warnning Use Warnings; Use Strict; Use CGI; # To debug Error Use CGI: carp QW

Remove spaces before and after a string in Perl

Use Regular Expressions Take two steps:Remove the preceding: $ A = ~ S/^ + //; Remove the following: $ A = ~ S/+ $ //;   One step: S/(^ s + | S + $) // G;   Delete the line break at the end of the string: The chomp function usually

Perl reads files

  1) The 3 methods for reading files are read by row and saved to the scalar while () {print;} Read by row, and saved to the array @ array = ; read the entire file and store the scalar $ string = do {local $/; ;}; 2) read the file instance open (Ep,

Install your own Perl modules

Install your own Perl modules. If you do not have the root permission, install Perl modules in your home directory. From: http://servers.digitaldaze.com/extensions/perl/modules.html Installing perl5 modules locally Normally, the perl5 module

Introduction to Perl (2)

The previous section describes the basic data types and usage methods in Perl. This section describes branch loop control and Io.   The syntax of the branch loop in Perl is similar to that in the C family language. The keywords include: If/else,

Perl: Environment Variables

How to Use the Perl script to operate system environment variables? Clever friends will immediately think of the special hash variable $ ENV provided in Perl. Right, some system variables can be obtained in $ ENV. How can this problem be obtained?

Perl: Time Functions

There are several time processing functions in Perl: 1,Time Function: Returns the cumulative number of seconds from January 1, January 1, 1970. Use: My $ t = time (); 2,Localtime Function: Get the local time zone Use: My $ T = localtime

The beginning of Perl Learning

I have been engaged in some technologies and languages recently. I don't have time to update this place .. Some time ago, it took a long time to learn. net3.0, 3.5, and other related things, including LINQ and lamabda... when reading these

In Perl, how do I write a strict Regular Expression for mail?

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> # ! /Usr/bin/perl-W $ Line   =   Stdin > ; Chomp ( $ Line ); If ( $ Line   = ~   / ( ^ [ - Za -

Perl custom functions for Processing Dates

# Recently, I used to deal with time issues. I simply wrote several functions. #! /Usr/bin/perl-W #================================ ========================================================== ========## copyright (c) 2009, # All Rights Reserved. #

Linux batch file replacement methods (Perl, sed, shell)

Original article link Linux Perl shell Perl VI grep awk xargs batch replacement Method 1:   Maven is used to build an application in the past two days. Due to the large project, there are more than 700 pom S. XML file, even more depressing

XML parsing components Java, C ++, and Perl

Http://xerces.apache.org/   TheApache xerces ProjectCurrently consists of the following sub-projects, each focused on the development of XML parsers and related components in varous ages: Apache xerces C ++-A processor for parsing, validating,

Study Perl cookbook

1:Substring Truncation   $ Value = substr ($ string, $ offset, $ count ); $ Value = substr ($ string, $ offset );   Substr ($ string, $ offset, $ count) = $ newstring; Substr ($ string, $ offset, $ count, $ newstring );#

REST: Neo4p-PERL version of "OGM"

REST: Neo4p-PERL version of "OGM" | Neo4j Chinese site-world's leading graph database --> REST: The Neo4p-PERL version of "OGM" was published in October 21, 2012 by neo4j This is a guest post by Mark A. Jenkins, a DC area bioinformatics

Fdupe: Find the Perl script code for duplicate files

Figure: Copy codeThe Code is as follows :#! /Usr/bin/perl # # Fdupe tool-finding duplicate files # # $ Id: fdupe, v 1.7 20:11:21 root Exp root $ # # Source code Copyright (c) 1998,2011 Bernhard Schneider. # May be used only for non-commercial cial

Use the Getopt: Long module in Perl to receive USER command line parameters.

In linux, we often use a program that requires adding parameters. Now let's take a look at the Getopt: Long module in perl, which is much more powerful than the array directly using @ ARGV. I want to know that there are two types of parameters in

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