how to learn perl

Comparison of Memcached operation speed between PHP and Perl; comparison of Memcached operation speed between PHP and Perl, recently, memcached was used in performance tests. php and perl were used to perform memcached operations. The results showed that the performance difference between php and perl on memcached oper

Access the content of mSQL and MySQL through Perl 1) knowledge preparation: 　　 To use Perl to access the content of the mSQL and MySQL databases, you must install some API modules. The following lists the names of required modules and their download URLs: I) regular installation required module: DBI-1.13 Perl language database universal interface Data-ShowTable-3

Maintenance function of 1.Unix systemAs we said earlier, Perl can be used as an alternative to traditional UNIX system maintenance tools, and in this context it can operate on text files, especially configuration files (which also remember how to configure text in a Linux system).2. CGI ScriptsOne of the most important functions of Perl is to write CGI applications. Because the interaction on the web is pri

Before you start This tutorial describes the debugging capabilities provided by the Eclipse's EPIC plug-in, which provides a rich debugging environment that can be used for the epic PERL development environment and integrated with this development environment. This tutorial assumes that the reader understands the ECLIPSE environment and has experience using Perl. About this tutorial EPIC combines two sys

Perl was popular seven or eight years ago, known as the Swiss Army knife. It is also a favorite of Regular Expression enthusiasts, system managers, and Web developers, but the current development trend is declining, and the release of Perl6 will always be "the next Christmas ". However, Perl is still the magic wand on Hackers amp; Geekers ". Some surveys and analyses are very interesting. Authenticity is i

Matches: m/Replacement: s/Conversion: tr/These three forms are generally used in conjunction with =~ or!~ (where "=~" means matching, read as does in the entire statement, "!~" for mismatches, read as doesn ' t in the entire statement), and a scalar variable to be processed on the left. If you do not have the variable and the =~!~ operator, the default is to handle the contents of the $_ variable. Examples are as follows:$str = "I love Perl";$str =~ m

Four basic data types in Perl (as far as I know): Scalar, array, list, and hash. Scalar should be the atomic Data Structure in Perl, which cannot be further decomposed by programmers, such as int and double in C language. For scalar, I have the following views: The name "scalar" is very strange. It has a very "physical" and "Mathematical" feeling, and it makes beginners think there must be a data type calle

requires a user call to execute, and here is a workflow between a Web browser, a Web server, and a CGI program.(1) The user accesses the CGI program through a Web browser.(2) The Web server receives the user request and gives it to the CGI program for processing.(3) CGI programs perform operations based on input data, including querying the database, calculating values, or invoking other programs in the system.(4) The CGI program produces output that some kind of Web server can understand.(5) T

How to delete a value from an array in Perl This article mainly introduces how to delete a value from an array in Perl? This article explains how to assign an array element to undef and then delete the element from the array. For more information, see I'm not sure whether undef has a definite relationship with the value removed from the array. I guess if we think of undef as "null", there will be some conne

very easy to understand, simple command syntax, and some basic object oriented processing capabilities, so that new users can learn in the shortest time. PHP provides many functions, including mathematical processing, string processing, network-related functions, various database support, image processing functions, and various types of PHP development for many developers. new features provide excellent scalability. PHP is very easy to combine with A

Ajax, a very popular technology recently. There are many ready-made development kits. At the beginning, I tried CPAINT and supported php/asp. Not bad. Later, we started to use perl's Ajax implementation: CGI: Ajax. In comparison, it is found that it is very useful. The main feature is that the program automatically generates javascript call code. In this way, we can focus on the development of program logic without ignoring complicated Ajax javascript calls. This is where CGI: Ajax is brilliant.

The types of characters included in the build password can be controlled by parameters #!/usr/bin/perl use strict; Use warnings; Use GETOPT::STD; Sub Show_help {print "useage:\n"; print "newp-aansl\n"; Print "-a\t\t The password contains lower case letters (A-Z) \ n"; Print "-a\t\t The password contains upper case letters (A-Z) \ n"; Print "-n\t\t The password contains numerical character (0-9) \ n"; Print "-s\t\t The password cont

First, install Perl [Root@centos ~]# wget http://www.cpan.org/src/5.0/perl-5.16.0.tar.gz [Root@centos ~]# tar zxvf perl-5.16.0.tar.gz [Root@centos ~]# CD perl-5.16.0 [Root@centos perl-5.16.0]# mkdir-p/usr/local/perl[Root@centos

Article Title: how to install Perl and Its modules in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Both Linux and perl are free software. It is amazing to combine them. Follow these steps to install perl in linux. 1.

A Perl application database uses the DBM package configured by itself to create and operate a database, therefore, the DBM package and other similar packages can be considered as a database extension. The other is to use the DBI package or similar packages to establish connections with other relational databases. Obviously, we usually need to use the latter. Database Interface (DBI) is written by Tim Bunce (Tim.Bunce@ig.co.uk), DBI is specifically wr

Use Perl socket To use the Perl Socket API, you must first load the socket module.Use SOCKET;========================================================== ====================================Socket (file handle, af_inet, data type, protocol type );# Create a socketYou can find a word for the file handle.Af_inet is a domain type or pf_inet.Data Types: sock_stream and sock_dgram.Protocol type, can be re

1. Simple Variables ============== 1. Integer$ X = 123456;Perl stores integer data in floating-point registers. In fact, integer variables are treated as floating-point numbers in Perl, but they are only a special column of floating-point data.The octal data starts with 0.$ Var1 = 047 (decimal 39)Hexadecimal data headers with 0x$ Var2 = 0x1f (decimal 31) 2. Floating Point TypeFloating-point registers are u

When developing PHP on Windows, the runtime environment is an essential part. We often choose the existing environment suite, currently, popular environment Kits include XAMPP, Wamp, apmserv, dedeampz, wnmp, and phpnow. Phpnow has been used for almost year 34. Today, Wamp is used in the company, and Wamp is very convenient to use. It also supports seamless switching between multiple versions. Today, when I had nothing to do, I replaced phpnow with Wamp and installed

-httpd-php. php Action application/x-httpd-php "/php/php.exe" 5. Restart Apache (net stop Apache, net start Apache) PHP4 can be run, create a file c:\apache\htdocs\info.php, Only one line of content: Then in the browser address bar, enter: PHP4 built-in MySQL support, no additional setup required "★★★zend Optimizer for PHP4 quick Install ★★★" 1. Extract the zendoptimizer-beta4-windowsnt.zip into a directory, such as C:\apache\zend 2. Modify the C:\winnt\php.ini and add the following two lines a

Komodo IDE + ActivePerlThe most common, entry-level, fool-mounted configuration.But now I use sublime-based, cross-platform are very useful, and plug-in really many, their own development convenience.SublimeCreate a newTools->build system->new Build System. Enter the following:{"cmd": ["Perl", "-w", "$file"],"File_regex": ". * ON (. *) line ([0-9]*)","Selector": "Source.perl"}Save As file name Perl.sublime-buildUltra EditBecause of the test environmen