how to learn perl

Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/ 1. Differences and relationships between Shell and PerlPerl is full of 10 thousand gold oil. It has implemented the functions of various system commands from its own interior, which is much more efficient. Moreover, it has specialized debugging tools that support object-oriented design, both small scripts and large applications are competent.Shell scripts are only applicable to simple system management. In my opinion, shell is like a binder. I

If you think Perl is just a tool for web developers, you need to rethink it now. It can also be part of your embedded programming tool. If you think Perl is just a tool for web developers, you need to rethink it now. It can also be part of your embedded programming tool. Perl is an advanced instruction language derived from C, sed, awk, and other programming lang

it, but I want to ask questions from others. If you encounter a problem, try to solve it first. If you feel that the knowledge span is large and cannot be solved within a short period of time, consult with others. Do not waste too much time on a problem. Use Perl online help Perl comes with a large amount of reference materials, which can be said to be more comprehensive and detailed than any

matching functions (close to the ideal regular expression language) * Complex and flexible data structures (array of array, array of Hash,hash of array, hash of hash, etc.) *unicode Support (relative to awk and C) The disadvantages are: * Dynamic type language, not very reliable * Natural language, is the advantage is also a flaw, make Perl language code may obscure; * Intelligent language, is the advantages and disadvantages: According to the contex

Recently, Perl has been re-learned due to project needs. To be honest, Perl makes me love and hate. Love it because it is really nice to write your own code. It is the language with the least code and the fastest speed. Hate is because it is too tired to read other people's code. However, in general, it is indeed the first language in text processing, and text processing is indeed too powerful.

I have to say that perl and php are two very similar languages. For php students like me, it is easy to learn perl. Here are some differences between perl and php: variables: The Integer Variables on perl are actually stored in the floating-point register of the computer and

@ array as a scalar, so it may not succeed ). · Principle 3: Regular Expressions match the earliest possible match of a given pattern. Lack of time, only match or replace the regular expression once ($ A = 'string string2'; $ A = ~ S/string //; causes $ A = 'string 2 '). · Principle 4: Regular Expressions can process any and all characters that double quotation marks can process ($ A = ~ M/$ varb/extend varb to a variable before matching. If $ varb = 'A' $ A = 'as', $ A = ~ S/$ varb //; equival

Author: hoowa Source: AKA magazine "How did Larry Wall invent a messy programming language-and then changed the Web landscape? " Larrywall smiled and recalled the message that David Filo, the co-founder of Yahoo, sent to him a few years ago, shortly before Yahoo was publicly available. file wrote: "Without Perl, the general programming language invented by wall, Yahoo cannot begin. so, Larry, are you willing to buy some cheap, Yahoo's original stock

Enable Perl before compiling Vim; Use the Perl interface ** Perl-using **: Perl **: Pe *: PE [RL]{cmd}Run the Perl Command{cmd}. The current package is "Main ". : PE [RL] {endpattern}{script}{endpattern}Execute the Perl script{s

recently, I have been studying in some forums and communities to find out that many people have a lot of bias towards Perl. I've studied Perl for so long, and it's a little bit of experience, so I've summed up the reason why everyone is biased against Perl, and there are two reasons for the following two:1. Perl is qui

. 02.tar.gz Fetching Http://search.cpan.org/CPAN/authors/id/S/SH/SHARYANTO/Alt-Base-0.02.tar . GZ ... Ok Configuring alt-base-0.02 ... Ok ==> Found Dependencies:alt --> Working on Alt Fetching http://www.cpan.org/authors/id/I/IN/INGY/Alt-0.04.tar.gz ... Ok Configuring Alt-0.04 ... Ok Building and Testing Alt-0.04 ... Ok Successfully installed Alt-0.04 Building and Testing alt-base-0.02 ... Ok Successfully installed alt-base-0.02 2 Distributions installed Then you

The translation respects the original and maximizes the original content in its own way. For more information, please visit www.from0701.com. Two chapters are updated weekly.Welcome to the next stage of Perl learning. The reason you're here may be that you want to write more than 100 lines of code or just that your boss is asking you to. Our "Getting Started with Perl" is so great because he describes how t

therefore does not adapt to the requirements of large applications, instead of the MVC-based Web architecture. The core idea of MVC is to divide the application into three parts: model, view and controller. The model refers to the data of the application, and the operation of the data, the view refers to the user interface, and the controller is responsible for the synchronization between the user interface and the program data. Through MVC's Web architecture, you can weaken the coupling of the

command that matches the mode. !! Command: run a shell command without exiting the debugger. H-number: displays the number of Debugging commands previously executed. If number is omitted, all executedDEBUG command. R: restart the program being debugged. Q or ^ D: exit the debugger. | Debugging command: display the output page of the debugging command. | Debugging command: similar to | debugging command, suitable for Debugging commands with a large number of outputs, for example: | Vmain. = Alia

As we all know, Perl is very powerful in processing strings, and Perl (Practical Extraction and Reporting Language) is also very powerful in processing formats. Here we start to learn some Perl formats and string processing. Familiar with the three most powerful functions: substr, pack, and unpack. 1. The case processi

With the in-depth development of network security requirements, network-based intrusion detection technology has become an important and interesting research direction. Want to learn NIDs technology in addition to read some ready-made information and some open-source system source, the best way is to write a nids program, only then can really realize some nids realization needs and design beauty. In essence, NIDs is just a network traffic analysis to

quickly build a good dynamic website system. Therefore, most foreign host systems are equipped with free APACHE + PHP + MYSQL. It is generally considered that the execution efficiency of such a combination is higher than that of IIS + ASP + ACCESS, while the latter must also pay for Microsoft. PHP syntax is similar to Perl, but PHP contains more functions than Perl. PHP has no namespace, so you must avoid