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Text File | 1998-10-28 | 19.6 KB | 463 lines

PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) 5555////AAAAuuuugggg////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222)))) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) NNNNAAAAMMMMEEEE perlfaq1 - General Questions About Perl ($Revision: 1.15 $, $Date: 1998/08/05 11:52:24 $) DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN This section of the FAQ answers very general, high-level questions about Perl. WWWWhhhhaaaatttt iiiissss PPPPeeeerrrrllll???? Perl is a high-level programming language with an eclectic heritage written by Larry Wall and a cast of thousands. It derives from the ubiquitous C programming language and to a lesser extent from sed, awk, the Unix shell, and at least a dozen other tools and languages. Perl's process, file, and text manipulation facilities make it particularly well- suited for tasks involving quick prototyping, system utilities, software tools, system management tasks, database access, graphical programming, networking, and world wide web programming. These strengths make it especially popular with system administrators and CGI script authors, but mathematicians, geneticists, journalists, and even managers also use Perl. Maybe you should, too. WWWWhhhhoooo ssssuuuuppppppppoooorrrrttttssss PPPPeeeerrrrllll???? WWWWhhhhoooo ddddeeeevvvveeeellllooooppppssss iiiitttt???? WWWWhhhhyyyy iiiissss iiiitttt ffffrrrreeeeeeee???? The original culture of the pre-populist Internet and the deeply-held beliefs of Perl's author, Larry Wall, gave rise to the free and open distribution policy of perl. Perl is supported by its users. The core, the standard Perl library, the optional modules, and the documentation you're reading now were all written by volunteers. See the personal note at the end of the README file in the perl source distribution for more details. See the _p_e_r_l_h_i_s_t manpage (new as of 5.005) for Perl's milestone releases. In particular, the core development team (known as the Perl Porters) are a rag-tag band of highly altruistic individuals committed to producing better software for free than you could hope to purchase for money. You may snoop on pending developments via news://genetics.upenn.edu/perl.porters-gw/ and http://www.frii.com/~gnat/perl/porters/summary.html. While the GNU project includes Perl in its distributions, there's no such thing as "GNU Perl". Perl is not produced nor maintained by the Free Software Foundation. Perl's licensing terms are also more open than GNU software's tend to be. You can get commercial support of Perl if you wish, although for most users the informal support will more than suffice. See the answer to "Where can I buy a commercial version of Page 1 (printed 10/23/98) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) 5555////AAAAuuuugggg////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222)))) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) perl?" for more information. WWWWhhhhiiiicccchhhh vvvveeeerrrrssssiiiioooonnnn ooooffff PPPPeeeerrrrllll sssshhhhoooouuuulllldddd IIII uuuusssseeee???? You should definitely use version 5. Version 4 is old, limited, and no longer maintained; its last patch (4.036) was in 1992. The most recent production release is 5.005_01. Further references to the Perl language in this document refer to this production release unless otherwise specified. There may be one or more official bug fixes for 5.005_01 by the time you read this, and also perhaps some experimental versions on the way to the next release. WWWWhhhhaaaatttt aaaarrrreeee ppppeeeerrrrllll4444 aaaannnndddd ppppeeeerrrrllll5555???? Perl4 and perl5 are informal names for different versions of the Perl programming language. It's easier to say "perl5" than it is to say "the _5(.004) release of Perl", but some people have interpreted this to mean there's a language called "perl5", which isn't the case. Perl5 is merely the popular name for the fifth major release (October 1994), while perl4 was the fourth major release (March 1991). There was also a perl1 (in January 1988), a perl2 (June 1988), and a perl3 (October 1989). The 5.0 release is, essentially, a complete rewrite of the perl source code from the ground up. It has been modularized, object-oriented, tweaked, trimmed, and optimized until it almost doesn't look like the old code. However, the interface is mostly the same, and compatibility with previous releases is very high. To avoid the "what language is perl5?" confusion, some people prefer to simply use "perl" to refer to the latest version of perl and avoid using "perl5" altogether. It's not really that big a deal, though. See the _p_e_r_l_h_i_s_t manpage for a history of Perl revisions. HHHHoooowwww ssssttttaaaabbbblllleeee iiiissss PPPPeeeerrrrllll???? Production releases, which incorporate bug fixes and new functionality, are widely tested before release. Since the 5.000 release, we have averaged only about one production release per year. Larry and the Perl development team occasionally make changes to the internal core of the language, but all possible efforts are made toward backward compatibility. While not quite all perl4 scripts run flawlessly under perl5, an update to perl should nearly never invalidate a program written for an earlier version of perl (barring Page 2 (printed 10/23/98) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) 5555////AAAAuuuugggg////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222)))) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) accidental bug fixes and the rare new keyword). IIIIssss PPPPeeeerrrrllll ddddiiiiffffffffiiiiccccuuuulllltttt ttttoooo lllleeeeaaaarrrrnnnn???? No, Perl is easy to start learning -- and easy to keep learning. It looks like most programming languages you're likely to have experience with, so if you've ever written an C program, an awk script, a shell script, or even BASIC program, you're already part way there. Most tasks only require a small subset of the Perl language. One of the guiding mottos for Perl development is "there's more than one way to do it" (TMTOWTDI, sometimes pronounced "tim toady"). Perl's learning curve is therefore shallow (easy to learn) and long (there's a whole lot you can do if you really want). Finally, Perl is (frequently) an interpreted language. This means that you can write your programs and test them without an intermediate compilation step, allowing you to experiment and test/debug quickly and easily. This ease of experimentation flattens the learning curve even more. Things that make Perl easier to learn: Unix experience, almost any kind of programming experience, an understanding of regular expressions, and the ability to understand other people's code. If there's something you need to do, then it's probably already been done, and a working example is usually available for free. Don't forget the new perl modules, either. They're discussed in Part 3 of this FAQ, along with the CPAN, which is discussed in Part 2. HHHHoooowwww ddddooooeeeessss PPPPeeeerrrrllll ccccoooommmmppppaaaarrrreeee wwwwiiiitttthhhh ooootttthhhheeeerrrr llllaaaannnngggguuuuaaaaggggeeeessss lllliiiikkkkeeee JJJJaaaavvvvaaaa,,,, PPPPyyyytttthhhhoooonnnn,,,, RRRREEEEXXXXXXXX,,,, SSSScccchhhheeeemmmmeeee,,,, oooorrrr TTTTccccllll???? Favorably in some areas, unfavorably in others. Precisely which areas are good and bad is often a personal choice, so asking this question on Usenet runs a strong risk of starting an unproductive Holy War. Probably the best thing to do is try to write equivalent code to do a set of tasks. These languages have their own newsgroups in which you can learn about (but hopefully not argue about) them. CCCCaaaannnn IIII ddddoooo [[[[ttttaaaasssskkkk]]]] iiiinnnn PPPPeeeerrrrllll???? Perl is flexible and extensible enough for you to use on almost any task, from one-line file-processing tasks to complex systems. For many people, Perl serves as a great replacement for shell scripting. For others, it serves as a convenient, high-level replacement for most of what they'd Page 3 (printed 10/23/98) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) 5555////AAAAuuuugggg////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222)))) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) program in low-level languages like C or C++. It's ultimately up to you (and possibly your management ...) which tasks you'll use Perl for and which you won't. If you have a library that provides an API, you can make any component of it available as just another Perl function or variable using a Perl extension written in C or C++ and dynamically linked into your main perl interpreter. You can also go the other direction, and write your main program in C or C++, and then link in some Perl code on the fly, to create a powerful application. That said, there will always be small, focused, special- purpose languages dedicated to a specific problem domain that are simply more convenient for certain kinds of problems. Perl tries to be all things to all people, but nothing special to anyone. Examples of specialized languages that come to mind include prolog and matlab. WWWWhhhheeeennnn sssshhhhoooouuuullllddddnnnn''''tttt IIII pppprrrrooooggggrrrraaaammmm iiiinnnn PPPPeeeerrrrllll???? When your manager forbids it -- but do consider replacing them :-). Actually, one good reason is when you already have an existing application written in another language that's all done (and done well), or you have an application language specifically designed for a certain task (e.g. prolog, make). For various reasons, Perl is probably not well-suited for real-time embedded systems, low-level operating systems development work like device drivers or context-switching code, complex multithreaded shared-memory applications, or extremely large applications. You'll notice that perl is not itself written in Perl. The new native-code compiler for Perl may reduce the limitations given in the previous statement to some degree, but understand that Perl remains fundamentally a dynamically typed language, and not a statically typed one. You certainly won't be chastized if you don't trust nuclear- plant or brain-surgery monitoring code to it. And Larry will sleep easier, too -- Wall Street programs not withstanding. :-) WWWWhhhhaaaatttt''''ssss tttthhhheeee ddddiiiiffffffffeeeerrrreeeennnncccceeee bbbbeeeettttwwwweeeeeeeennnn """"ppppeeeerrrrllll"""" aaaannnndddd """"PPPPeeeerrrrllll""""???? One bit. Oh, you weren't talking ASCII? :-) Larry now uses "Perl" to signify the language proper and "perl" the implementation of it, i.e. the current interpreter. Hence Tom's quip that "Nothing but perl can parse Perl." You may Page 4 (printed 10/23/98) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) 5555////AAAAuuuugggg////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222)))) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) or may not choose to follow this usage. For example, parallelism means "awk and perl" and "Python and Perl" look ok, while "awk and Perl" and "Python and perl" do not. IIIIssss iiiitttt aaaa PPPPeeeerrrrllll pppprrrrooooggggrrrraaaammmm oooorrrr aaaa PPPPeeeerrrrllll ssssccccrrrriiiipppptttt???? It doesn't matter. In "standard terminology" a _p_r_o_g_r_a_m has been compiled to physical machine code once, and can then be be run multiple times, whereas a _s_c_r_i_p_t must be translated by a program each time it's used. Perl programs, however, are usually neither strictly compiled nor strictly interpreted. They can be compiled to a byte code form (something of a Perl virtual machine) or to completely different languages, like C or assembly language. You can't tell just by looking whether the source is destined for a pure interpreter, a parse-tree interpreter, a byte code interpreter, or a native-code compiler, so it's hard to give a definitive answer here. WWWWhhhhaaaatttt iiiissss aaaa JJJJAAAAPPPPHHHH???? These are the "just another perl hacker" signatures that some people sign their postings with. About 100 of the of the earlier ones are available from http://www.perl.com/CPAN/misc/japh . WWWWhhhheeeerrrreeee ccccaaaannnn IIII ggggeeeetttt aaaa lllliiiisssstttt ooooffff LLLLaaaarrrrrrrryyyy WWWWaaaallllllll wwwwiiiittttttttiiiicccciiiissssmmmmssss???? Over a hundred quips by Larry, from postings of his or source code, can be found at http://www.perl.com/CPAN/misc/lwall-quotes . HHHHoooowwww ccccaaaannnn IIII ccccoooonnnnvvvviiiinnnncccceeee mmmmyyyy ssssyyyyssssaaaaddddmmmmiiiinnnn////ssssuuuuppppeeeerrrrvvvviiiissssoooorrrr////eeeemmmmppppllllooooyyyyeeeeeeeessss ttttoooo uuuusssseeee vvvveeeerrrrssssiiiioooonnnn ((((5555////5555....000000005555////PPPPeeeerrrrllll iiiinnnnsssstttteeeeaaaadddd ooooffff ssssoooommmmeeee ooootttthhhheeeerrrr llllaaaannnngggguuuuaaaaggggeeee))))???? If your manager or employees are wary of unsupported software, or software which doesn't officially ship with your Operating System, you might try to appeal to their self-interest. If programmers can be more productive using and utilizing Perl constructs, functionality, simplicity, and power, then the typical manager/supervisor/employee may be persuaded. Regarding using Perl in general, it's also sometimes helpful to point out that delivery times may be reduced using Perl, as compared to other languages. If you have a project which has a bottleneck, especially in terms of translation or testing, Perl almost certainly will provide a viable, and quick solution. In conjunction with any persuasion effort, you should not fail to point out that Perl is used, quite extensively, and with extremely reliable and valuable results, at many large computer software and/or Page 5 (printed 10/23/98) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) 5555////AAAAuuuugggg////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222)))) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) hardware companies throughout the world. In fact, many Unix vendors now ship Perl by default, and support is usually just a news-posting away, if you can't find the answer in the _c_o_m_p_r_e_h_e_n_s_i_v_e documentation, including this FAQ. If you face reluctance to upgrading from an older version of perl, then point out that version 4 is utterly unmaintained and unsupported by the Perl Development Team. Another big sell for Perl5 is the large number of modules and extensions which greatly reduce development time for any given task. Also mention that the difference between version 4 and version 5 of Perl is like the difference between awk and C++. (Well, ok, maybe not quite that distinct, but you get the idea.) If you want support and a reasonable guarantee that what you're developing will continue to work in the future, then you have to run the supported version. That probably means running the 5.005 release, although 5.004 isn't that bad (it's just one year and one release behind). Several important bugs were fixed from the 5.000 through 5.003 versions, though, so try upgrading past them if possible. Of particular note is the massive bughunt for buffer overflow problems that went into the 5.004 release. All releases prior to that, including perl4, are considered insecure and should be upgraded as soon as possible. AAAAUUUUTTTTHHHHOOOORRRR AAAANNNNDDDD CCCCOOOOPPPPYYYYRRRRIIIIGGGGHHHHTTTT Copyright (c) 1997, 1998 Tom Christiansen and Nathan Torkington. All rights reserved. When included as an integrated part of the Standard Distribution of Perl or of its documentation (printed or otherwise), this works is covered under Perl's Artistic Licence. For separate distributions of all or part of this FAQ outside of that, see the _p_e_r_l_f_a_q manpage. Irrespective of its distribution, all code examples here are public domain. You are permitted and encouraged to use this code and any derivatives thereof in your own programs for fun or for profit as you see fit. A simple comment in the code giving credit to the FAQ would be courteous but is not required. Page 6 (printed 10/23/98) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) 5555////AAAAuuuugggg////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222)))) PPPPEEEERRRRLLLLFFFFAAAAQQQQ1111((((1111)))) Page 7 (printed 10/23/98)