comp.lang.perl FAQ 1/5 - Availability 
Author Message
 comp.lang.perl FAQ 1/5 - Availability

Archive-name: perl-faq/part1
Version: $Id: part1,v 2.8 1995/04/21 15:14:01 spp Exp spp $
Posting-Frequency: bi-weekly
Change-Log: $Log: part1,v $
# Revision 2.8  1995/04/21  15:14:01  spp
# 04/17/95 -  Changed extensions question to list some of the major sites
#           only.  In response to Tom Christiansen's recent request for
#           the archives to carry all extensions.
# 04/17/95 -  Modified ftp.cs.ruu.nl listings for new layout.
# 04/17/95 -  Modified NT port information.
#
# Revision 2.7  1995/04/04  16:38:25  spp
# 03/23/95 -  Added information about Matthias Neeracher's PowerPC Mac port.
#
# Revision 2.6  1995/03/17  16:46:57  spp
# 02/21/95 -  Fixed typos
# 02/24/95 -  Fixed missing address
# 02/27/95 -  Updated info on NT port
#
# Revision 2.5  1995/01/31  14:44:47  spp
# 01/23/95 -  Fixed perl5-porters address
# 01/23/95 -  Fixed unknown IP address
# 01/25/95 -  Fixed typos
# 01/30/95 -  Added information on Amiga port
# 01/31/95 -  Reworked section on documentation to include TeXinfo source
#

This posting contains answers to general information and availability
questions.  The following questions are answered in this posting:

1.1) What is Perl?

    Perl is a compiled scripting language written by Larry Wall*.

    Here's the beginning of the description from the perl(1) man page:

        Perl is an interpreted language optimized for scanning arbi-
        trary  text  files,  extracting  information from those text
        files, and printing reports based on that information.  It's
        also  a good language for many system management tasks.  The
        language is intended to be practical  (easy  to  use,  effi-
        cient,  complete)  rather  than  beautiful  (tiny,  elegant,
        minimal).  It combines (in  the  author's  opinion,  anyway)
        some  of the best features of C, sed, awk, and sh, so people
        familiar with those languages should have little  difficulty
        with  it.  (Language historians will also note some vestiges
        of csh, Pascal,  and  even  BASIC-PLUS.)  Expression  syntax
        corresponds  quite  closely  to C expression syntax.  Unlike
        most Unix utilities, perl does  not  arbitrarily  limit  the
        size  of your data--if you've got the memory, perl can slurp
        in your whole file as a  single  string.   Recursion  is  of
        unlimited  depth.   And  the hash tables used by associative
        arrays grow as necessary to  prevent  degraded  performance.
        Perl  uses sophisticated pattern matching techniques to scan
        large amounts of data very quickly.  Although optimized  for
        scanning  text, perl can also deal with binary data, and can
        make dbm files look like associative arrays  (where  dbm  is
        available).   Setuid  perl scripts are safer than C programs
        through a dataflow tracing  mechanism  which  prevents  many
        stupid  security  holes.   If  you have a problem that would
        ordinarily use sed or awk or sh, but it exceeds their  capa-
        bilities  or must run a little faster, and you don't want to
        write the silly thing in C, then perl may be for you.  There
        are  also  translators to turn your sed and awk scripts into
        perl scripts.  OK, enough hype.

1.2) What are perl4 and perl5, are there any differences?

    Perl4 and perl5 are different versions of the language.  Perl4 was the
    previous release, and perl5 is "Perl: The Next Generation."
    Perl5 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.

1.3) What features does perl5 provide over perl4?

    If you get the newest source (from any of the main FTP sites), you will
    find a directory full of man pages (possibly to be installed as section
    1p and 3pm) that discuss the differences, new features, old
    incompatibilies and much more.  Here, however, are some highlights as
    to the new feature and old incompatibilites.

    * Enhanced Usability:  Perl code can now be written in a much more
        legible style.  Regular expressions have been enhanced to allow
        minimal matches, conditionals, and much more.  Cryptic variable
        names (although still supported) have been aliased to new
        nmemonics, using the "English" module, allowing old scripts to run
        and new scripts to be readable.  Error messages and optional
        warnings are more informative and will catch many common mistakes.
        See the perldiag(1) man page, which contains pithy prose from Larry
        Wall* on each and every possible muttering perl might spout at you.
    * Simplified Grammar:  The new yacc grammar is one half the size of
        the old one.  Many of the arbitrary grammer rules have been
        regularized.  The number of reserved words has been cut by 2/3.
    * Lexical Scoping:  Perl variables may now be declared within a
        lexical scope, similar to C's "auto" variables.  This is a
        great improvement on efficiency and contributes to better
        privacy.  See the my() entry in perlfunc(1).
    * Arbitrarily nested data structures:  Full fledged multidimensional
        arrays.  Any scalar value, including an array element, may now
        contain a reference to any other variable or subroutine.
        Easily created anonymous variables and subroutines.  See
        perlref(1).
    * Modularity and Reusability:  The Perl library is now defined in
        terms of modules which can be easily shared among various
        packages.  Packages can import any or all of a module's
        published interface.  See perlmod(1), perlsub(1), and
        Exporter(3pm).
    * Object-oriented programming:  A package can function as a class.
        Dynamic multiple inheritance and virtual methods are supported
        in a straight-forward manner with little new syntax.  Filehandles
        are now treated as objects.  See perlobj(1), perlmod(1), and
        FileHandle(3pm).
    * Embeddible and Extensible:  Perl can be easily embedded in C/C++
        applications, and can either call or be called by your routines
        through a documented interface.  The XS preprocessor is provided to
        make it easy to glue your C/C++ routines into Perl.  Dynamic
        loading of modules is supported.  See perlapi(1), perlcall(1), and
        DynaLoader(3pm).
    * POSIX compliant:  A major new module is the POSIX module, which
        provides access to all available POSIX routines and definitions.
        Seee POSIX(3pm).
    * Package constructors and destructors:  The new BEGIN and END blocks
        provide means to capture control as a package is being compiled and
        after the program exits.  As a degenerate case, they work just like
        awk's BEGIN and END when you use the -p or -n switches.  See
        perlmod(1).
    * Multiple simultaneous DBM implementations:  A perl program now has
        access to DBM, NDBM, SDBM, GDBM and Berkeley DB files in the same
        script.  The dbmopen interface has been generalized to allow any
        variable to be tied to an object class which defines its access
        methods.  tie/untie now preferable to dbmopen/dbmclose.  See the
        tie() entry in perlfunc(1) and the DB_File(3pm) man pages.
    * Subroutine definitions may now be autoloaded:  The AUTOLOAD mechanism
        allows any arbitrary semantics to undefined subroutine calls.  See
        the section on Autoloading in the perlsub(1) manpage.
    * Regular Expression Enhancements:  Qualifiers may be followed by a "?"
        to signify that they should be non-greedy.  A "?" directly after
        an opening paren indicates non backreference grouping and the next
        character determines the purpose of the match (?:a|b|c) will match
        any of a b or c without producing a backreference, (?=stuff) does
        a non-eating look ahead to assure that the next thing is stuff,
        (?!nonsense) looks ahead to assure that the next thing must not
        be "nonsense".  Embedded whitespace and comments for readability.  
        A consistent extensibility mechanism has been added that is
        upwardly compatible with all old regexps.  Variables may now be
        interpolated literally into a pattern with \Q or the quotemeta
        fuction, which works like \U but backwhacks non-alphanumerics.  
        New m and s "flags" for pattern matching force multi- or
        single-line matching.  The "s" makes "." match "\n".  \A and
        \Z anchor matches to the beginning and end of a string and ignore
        multiline semantics.  \G matches where the previous m//g or s///g
        left off.
    * The -w (warnings) switch is much more informative.
    * References and Objects (see t/op/ref.t) for examples.
    * => is a synonym for comma and helps group paired arguments, such
        as initializers for associative arrays and named arguments to
        subroutines.
    * All functions, even predeclared subroutines, are treated as list
        operators or unary operators.  Parens are optional.
    * Flattened interpreter:  Compare perl4's eval.c with perl5's pp.c.
        Compare perl4's 900 line interpreter look with perl5's one line.
    * eval is now treated like a subroutine call, meaning (among other
        things) you can return from it.
    * format value lists may be spread over multiple lines with a do {}
        block.
    * flags on the #! line are interpreted even if the script wasn't
        invoked directly.
    * ?: is now an lvalue.
    * list context now propogates to the right side of && and ||, and
        as the 2nd and 3rd arguments of ?:
    * preferred package delimeter now :: rather than '.
    * new "and" and "or" operators, like && and || but with a lower
        precedence than comma, so they work better with list operators.
    * New functions abs(), chr(), uc(), ucfirst(), lc(), and lcfirst()
    * require(number) checks to see that the version is at least that
        version
    * qw//, which is equivalent to split(' ', q//)
    * assignment of a reference to a glob replaces the single element
        of the glob corresponding to the reference type:
            *foo = \$bar, * foo = \&bletch;
    * filehandle methods are supported:
        output_autoflush STDOUT 1;
    * Autoload stubs can now call the replacement subroutine with
        goto &realsub.
    * Subroutines can be defined lazily in any package by declaring
        an AUTOLOAD routine, which will be called if a non-existant
        subroutine is called in that package.
    * "use" and "no" subsume many feautres.  "use Module LIST" is
        short for "BEGIN { require Module; import Module LIST }"
        "no" is identical, except that it calls "unimport" instead.
        "use integer" and variations of "use strict [vars,refs,subs]"
        were implemented through new modules.

(Thanks to Tom Christiansen* for this section)

1.4) Where can I get docs on perl5?

    The complete perl documentation is available with the Perl
    distribution, or can be accessed from the following sites.
    Note that the PerlDoc ps file is 240 pages long!!

    Marked Up (HTML) format:
        http://www.*-*-*.com/
        http://www.*-*-*.com/ ;               (Europe)

    postscript:
        ftp://ftp.uu.net/languages/perl/PerlDoc.ps.gz
        ftp://prep.ai.mit.edu/pub/gnu/PerlDoc.ps.gz
        ftp://ftp.cbi.tamucc.edu/pub/duff/Perl/PerlDoc.ps.gz
        ftp://www.metronet.com/pub/perlinfo/perl5/manual/PerlDoc.ps.gz
        ftp://ftp.zrz.tu-berlin.de/pub/unix/perl/PerlDoc.ps.gz  (Europe)
        ftp://ftp.cs.ruu.nl/pub/PERL/perl5.0/doc/PerlDoc.ps.gz  (Europe)
        ftp://sungear.mame.mu.oz.au/pub/perl/doc/PerlDoc.ps.gz  (Oz)

    TeXinfo (Emacs) Format:
        ftp://www.metronet.com/pub/perl/perl5/manual/perl5-info.tar.gz

1.5) Will perl5 break my perl4 scripts?

    In general, no.  However, certain bad old practices have become highly
    frowned upon.  The following are the most important of the known
    incompatibilies between perl4 and perl5.  See perltrap(1) for more
    details.





    The compiler catches this.
    * "open FILE || die" needs to be "open(FILE) || die".  The compiler
      forgives you for this, but won't stop complaining until you fix it.
    * Barewords are no longer (necessarily) strings: they will actually
      call the function (if it existed when that code was compiled)
      instead of returning a string of that value.  Check your
      signal handlers.  The 'use strict subs' pragma (see strict(3pm))
      will help you with this.

      and likewise "$y = scalar keys %foo + 30" needs to be instead
      "$y = scalar keys(%foo) + 30".
    * The internal symbol table is called %{PACKAGE::} for any given
      package.  It used to be %{_PACKAGE}.
    * You may no longer (attempt to) write to read-only variables, like $1,
      or assign to a substr() past the end of a string.
    * Various deprecated practices elicit warning messages.

1.6) When will Perl stabilize?

When asked at what point the Perl code would be frozen, Larry answere:

    Part of the redesign of Perl is to *allow* us to more or less freeze
    the language itself.  It won't totally freeze, of course, but I think
    the rate of change of the core of the language is asymptotically
    approaching 0.  In fact, as time goes on, now that we have an official
    extension mechanism, some of the things that are currently in the core
    of the language may move out (transparently) as extensions.  This has
    already happened to dbmopen().

    I've also been continuously reminding myself of what Henry Spencer
    calls "second system syndrome", in which everything under the sun gets
    added, resulting in a colossal kludge, like OS 360.  You'll find that
    the new features in Perl 5 are all pretty minimalistic.  The
    object-oriented features in particular added only one new piece of
    syntax, a C++-style method call.

    : The whole idea
    : Perl is to be a fast text-processing, system-maintenance, zero-startup
    : time language. If it gets to be so large and complicated that it isn't
    : fast-running and easy to use, it won't be to anyone's benefit.

    My motto from the start has been, "If it ain't broke, don't fix it."
    I've been trying very hard not to remove those features from Perl that
    make it what it is.  At the same time, a lot of streamlining has gone
    into the syntax.  The new yacc file is about half the size of the old
    one, and the number of official reserved words has been cut by 2/3.
    All built-in functions have been unified (dualified?) as either list
    operators or unary operators.

    : I really like a lot of the features in Perl, but in order for Perl to
    : be useful on a long term basis, those features have to stay put. I
    : bought the Camel book less than a year ago and it sounds like within
    : another year it will be obsolete.

    The parts of Perl that the Camel book covers have not changed all that
    much.  Most old scripts still run.  Many scripts from Perl version 1.0
    still run.  We'll certainly be revising the Camel, but the new man
    pages are split up such that it's pretty easy to ferret out the new
    info when you want it.

    We did break a few misfeatures in going to Perl 5.  It seemed like the
    first and last chance to do so.  There's a list of the
    incompatibilities in the documentation.

    : Not only is it a lot of work to recompile Perl
    : on 20+ machines periodically, but it's hard to write scripts that are
    : useful in the long term if the guts of the language keep changing.
    : (And if I keep having to buy new books. I keep hearing about new
    : features of Perl 5 that aren't documented in any of the perl 5
    : documentation that *I* can find.)

    I think you'll find a lot of folks who think that 4.036 has been a
    pretty stable platform.

    Perl 5 is a special case.  I've been working on it for years.  (This is
    part of the reason 4.036 has been so stable!)  There are many changes,
    most of them for the better, I hope.  I don't expect the transition to
    be without pain.  But that's why I stuck numbered versions out in your
    bin directory, so that you can upgrade piecemeal if you like.  And
    that's why I made the -w switch warn about many of the incompatibilities.

    And overriding all that, I've tried to keep it so that you don't have
    to know much about the new stuff to use the old stuff.  You can upgrade
    your *knowledge* piecemeal too.

    The extension mechanism is designed to take over most of the
    evolutionary role from now on.  And it's set up so that, if you don't
    have a particular extension, you know it right up at the front.

    : Are there any plans to write a Perl compiler? While interpreted Perl
    : is great for many applications, it would also be cool to be able to
    : precompile many scripts. (Yes, I know you can undump things, but
    : undump isn't provided with Perl and I haven't found a copy.) The
    : creation of a perl library and dynamically-loadable modules seems
    : like a step in that direction.  

    Yes, part of the design of Perl 5 was to make it *possible* to write a
    compiler for it.  It could even be done as an extension module, I
    suppose.  Anyone looking for a master's thesis topic?

    In summary, almost every concern that you might think of has already
    been (at least) thought about.  In a perfect world, every concern
    could be addressed perfectly.  But in this world we just have to slog
    through.

1.7) What's the difference between "perl" and "Perl"?

    32!  [ ord('p') - ord('P') ]  (Shouldn't that be 42, the Answer to the
                Great Question of Life, the Universe, and Everything?  ;)

    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."

    On the other hand, the aesthetic value of casewise parallelism in
    "awk", "sed", and "perl" as much require the lower-case version as "C",
    "Pascal", and "Perl" require the upper-case version.  It's also easier
    to type "Perl" in typeset print than to be constantly switching in
    Courier. :-)

    In other words, it doesn't matter much, especially if all you're doing
    is hearing someone talk about the language; case is hard to distinguish
    aurally.

1.8) Is it a perl program or a perl script?

    It depends on whether you are talking about the perl binary or
    something that you wrote using perl.  And, actually, even this isn't
    necessarily true.

    "Standard" UNIX terminology is (roughly) this:  programs are compiled
    into machine code once and run multiple times, scripts are translated
    (by a program) each time they are used.  However, some say that a
    program is anything written which is executed on a computer system.
    Larry considers it a program if it is set in stone and you can't change
    it, whereas if you can go in and hack at it, it's a script.  Of course,
    if you have the source code, that makes just about anything a
    script.  ;)

    In general, it probably doesn't really matter.  The terms are used
    interchangeably.  If you particularly like one or the other, use it.  If
    you want to call yourself a perl programmer, call them programs.  If
    you want to call yourself a perl scripter, call them scripts.  Randal*
    and I (at least) will call them hacks.  (See question 2.10 ;)

1.9) Is perl difficult to learn?

    Not at all.  Many people find Perl extremely easy to learn.  There are
    at least three main reasons for this.

    The first reason is that most of Perl has been derived from standard
    utilities, tools, and languages that you are (probably) already
    familiar with.  If you have any knowledge of the C programming language
    and standard C library, the Unix Shell, sed and awk, Perl should be
    simple and fun for you to learn.

    The second reason that Perl is easy to learn is that you only have to
    know a very small subset of Perl to be able to get useful results.  In
    fact, once you can master

        #!/usr/local/bin/perl
         print "Hello, world\n";

    you can start writing Perl scripts.  In fact, you will probably never
    have to (or be able to) know everything about Perl.  As you feel the
    need or desire to use more sophisticated features (such as C structures
    or networking), you can learn these as you go.  The learning curve for
    Perl is not a steep one, especially if you have the headstart of having
    a background in UNIX.  Rather, its learning curve is gentle and
    gradual, but it *is* admittedly rather long.

    The third reason is that you can get immediate results from your
    scripts.  Unlike a normal compiled language (like C or Pascal, for
    example), you don't have to continually recompile your program every
    time you change one little thing.  Perl allows you to experiment and
    test/debug quickly and easily.  This ease of experimentation flattens
    the learning curve even more.

    If you don't know C or UNIX at all, it'll be a steeper learning curve,
    but what you then learn from Perl will carry over into other areas,
    like using the C library, UNIX system calls, regular expressions, and
    associative arrays, just to name a few.  To know Perl is to know UNIX,
    and vice versa.

1.10) Should I program everything in Perl?

    Most definitely.  In fact, you should delete the binaries for sed, awk,
    cc, gcc, grep, rm, ls, cat... well, just delete your /bin directory.

    But seriously, of course you shouldn't.  As with any job, you should
    use the appropriate tool for the task at hand.  Just because a hammer
    will put screws into a piece of board, you probably don't want to do
    that.

    While it's true that the answer to the question "Can I do (some
    arbitrary task) in Perl?" is almost always "yes", that doesn't mean
    this is necessarily a good thing to do.  For many people, Perl serves
    as a great replacement for shell programming.  For a few people, it
    also serves as a replacement for most of what they'd do in C.  But for
    some things, Perl just isn't the optimal choice, such as tasks
    requiring very complex data structures.

1.11) How does Perl compare with other scripting languages, like Tcl, python
     or REXX?

    REXX is an interpreted programming language first seen on IBM systems.
    Python is an interpreted programming language by Guido van Rossum*.
    TCL is John Ousterhout*'s embeddable command language, designed just
    for embedded command extensions, but lately used for larger
    applications.  TCL's most intriguing feature for many people is the
    tcl/tk toolset that allows for interpreted X-based tools.  Others use
    it for its "expect" extension.

    To avoid any flamage, if you really want to know the answer to this
    question, probably the best thing to do is try to write equivalent
    code to do a set of tasks.  All three have their own newsgroups in
    which you can learn about (but hopefully not argue about) these
    languages.

    To find out more about these or other languages, you might also check
    out David Muir Sharnoff*'s posting "Catalog of Compilers, Interpreters,
    and Other Language Tools" which he posts to comp.lang.misc,
    comp.sources.d, comp.archives.admin, and news.answers newsgroups.  It's
    a comprehensive treatment of many different languages.  (Caveat lector:
    he considers Perl's syntax "unappealing".)

1.12) How can I get Perl over the Internet?

    Perl is available from any comp.sources.misc archive.  You can use an
    archie server (see the alt.sources FAQ in news.answers) to find these
    if you want.

      Version 4:
        Volume  Issues  Patchlevel and Notes
        ------  ------  ------------------------------------------------
          18    19-54   Patchlevel 3, Initial posting.
          20    56-62   Patches 4-10    

      Version 5:
        Volume  Issues  Patchlevel and Notes
        ------  ------  -----------------------------------------------
          45    64-128  Initial Posting, patchlevel 0.

    Since 1993, a number of archives have sprung up specifically for Perl
    and Perl related items.  Larry maintains the official distribution
    site (for both perl4.036 and perl5) at netlabs.  Probably the largest
    archive is at the University of Florida.  In order of probability these
    sites will have the sources.

        Site                IP              Directory and notes
        -----------         -------         -------------------------------
    North America:
        ftp.netlabs.com     192.94.48.152   /pub/outgoing/perl[VERSION]/
        ftp.cis.ufl.edu     128.227.100.198 /pub/perl/src/[VERSION]/
        prep.ai.mit.edu     18.71.0.38      /pub/gnu/perl5.001.tar.gz
        ftp.uu.net          192.48.96.9     /languages/perl/perl5.001.tar.gz
        ftp.khoros.unm.edu  198.59.155.28   /pub/perl/perl5.001.tar.gz
        ftp.cbi.tamucc.edu  165.95.1.3      /pub/duff/Perl/perl5.001.tar.gz
        ftp.metronet.com    192.245.137.1   /pub/perl/sources/
        genetics.upenn.edu  128.91.200.37   /perl5/perl5_000.zip

    Europe:
        ftp.cs.ruu.nl       131.211.80.17   /pub/PERL/perl5.0/src/perl5.001.tar.gz
        ftp.funet.fi        128.214.248.6  
                            /pub/languages/perl/ports/perl5/perl5.001.tar.gz
        ftp.zrz.tu-berlin.de 130.149.4.40   /pub/unix/perl/perl5.001.tar.gz
        src.doc.ic.ac.uk    146.169.17.5    /packages/perl5/perl5.001.tar.gz

    Australia:
        sungear.mame.mu.oz.au 128.250.209.2 /pub/perl/src/5.0/perl5.001.tar.gz

    South America (mirror of prep.ai.mit.edu:/pub/gnu):
        ftp.inf.utfsm.cl    146.83.198.3    /pub/gnu/perl5.001.tar.gz

    If there is a site in Asia or Japan, please tell us about it.  Thanks!

    You can also retrieve perl via non-ftp methods:

        http: //src.doc.ic.ac.uk/packages/perl5/perl5.001.tar.gz
        gopher:       //src.doc.ic.ac.uk/0/packages/perl5/perl5.001.tar.gz

1.13) How can I get Perl via Email?

    The following is a list of known ftpmail sites.  Please attempt to use
    the site closest to you with the ftp archive closest to it.  Many of
    these sites already have perl on them.  For information on how to use
    one of these sites, send email containing the word "help" to the
    address.

        United States:



        Europe/UK:




    Henk P Penning* suggests that if you are in Europe you should try the
    following (if you are in Germany or the UK, you should probably use one
    of the servers listed above):


         begin
         path your_email_address
         send help
         send PERL/perl5.0/INDEX
         end
        The path-line may be omitted if your message contains a normal
        From:-line.  You will receive a help-file and an index of the
        directory that contains the Perl stuff.

    If all else fails, mail to Larry usually suffices.

1.14) How can I get Perl via UUCP?

    There currently is no way of getting Perl via UUCP.  If anyone knows of
    a way, please contact me.  The OSU site has discontinued the service.

1.15) Are there other ways of getting perl?

    Another possibility is to use UUNET, although they charge you for it.
    You have been duly warned.  Here's the adverti{*filter*}t:

               Anonymous Access to UUNET's Source Archives

                             1-900-GOT-SRCS

        UUNET now provides access to its extensive collection of UNIX
    related sources to non- subscribers.  By  calling  1-900-468-7727
    and  using the login "uucp" with no password, anyone may uucp any
    of UUNET's on line source collection.  Callers will be charged 40
    cents  per  minute.   The charges will appear on their next tele-
    phone bill.

         The file uunet!/info/help contains instructions.   The  file
    uunet!/index//ls-lR.Z  contains  a  complete  list  of  the files
    available  and is  updated daily.   Files ending  in Z need to be
    uncompressed before being used.  The file uunet!~/compress.tar is
    a tar archive containing the C sources for the uncompress program.

         This service provides a  cost  effective  way  of  obtaining
    current  releases  of sources without having to maintain accounts
    with UUNET or some other service.  All modems  connected  to  the
    900  number  are  Telebit T2500 modems.  These modems support all
    standard modem speeds including PEP, V.32 (9600), V.22bis (2400),
    Bell  212a  (1200), and Bell 103 (300).  Using PEP or V.32, a 1.5
    megabyte file such as the GNU C compiler would cost $10  in  con-
    nect  charges.   The  entire  55  megabyte X Window system V11 R4
    would cost only $370 in connect time.  These costs are less  than
    the  official  tape  distribution fees and they are available now
    via modem.

                      UUNET Communications Services
                   3110 Fairview Park Drive, Suite 570
                         Falls Church, VA 22042
                         +1 703 876 5050 (voice)
                          +1 703 876 5059 (fax)

1.16) Has perl been ported to machine FOO?

    Perl runs on virtually all Unix machines simply by following the hints
    file and instructions in the Configure script.  This auto-configuration
    script allows Perl to compile on a wide variety of platforms by
    modifying the machine specific parts of the code.  For most Unix
    systems, or VMS systems for v5 perl, no porting is required.  Try to
    compile Perl on your machine.  If you have problems, examine the README
    file carefully.  If all else fails, send a message to comp.lang.perl
    and crosspost to comp.sys.[whatever], there's probably someone out
    there that has already solved your problem and will be able to help you
    out.

    Perl4.036 has been ported to many non-Unix systems, although currently
    there are only a few (beta) v5 ports.  All of the following are
    mirrored at ftp.cis.ufl.edu:/pub/perl/src/[OS]/.  The following are the
    (known) official distribution points.  Please contact the porters
    directly (when possible) in case of questions on these ports.

        * MS-DOS binaries and source are available at ftp.ee.umanitoba.ca
          [130.179.8.47] in /pub/msdos/perl/perl4
          There are currently half a dozen different ports for MS-DOS.
          BigPerl4 (v4) is perl4.036 compiled with the Watcom C/C++^32
          compiler (32-bit, flat-memory model C compiler) with the
          following features:
            * Up to 32MB of memory can be used.
            * Supports virtual memory.
            * Works under Windows 3.1
            * The perl de{*filter*} can be used.
            * Contains Berkeley DB support.  GDBM is no longer supported.

          Note that the latest version of BigPerl4 can also be found at
          any SimTel mirror site (ftp.ee.umanitoba.ca does not
          necessarily have the latest version), such as:

                ftp://oak.oakland.edu/SimTel/msdos/perl/

          A beta-test version of bigperl based on Perl 5.000 can be
          obtained from the following sites:

            ftp.einet.net:/pub/perl5
            ftp.khoros.unm.edu:/pub/perl/msdos
            ftp.ee.umanitoba.ca:/pub/msdos/perl/perl5

          This beta-test bigperl also contains ported versions of a2p and
          s2p.

        * Windows/NT binaries are available from ftp.intergraph.com in
          /pub/win32/perl, or at any of the major NT archives.  They are
          compiled for NT 3.5, but appears to work under Win95 also.  It is
          visible to the NT Registry.  Dean Troyer* is working on extending
          the visibility to SAM and the Event Log.  His current
          work-in-progress is available from
          ftp://pmip.dist.maricopa.edu/pub/nt.

        * Machintosh binaries and source are available from nic.switch.ch
          [130.59.1.40] in /software/mac/perl.
          Version 4.1.3 is perl4.036 compiled with the MPW C compiler
            * Mac_Perl_413_src.sit.bin      Sources
            * Mac_Perl_413_tool.sit.bin     MPW Tool
            * Mac_Perl_413_appl.sit.bin     Standalone Application
          There is a mailing list for discussing Macintosh Perl.  Contact

          Timothy Murphy* also ported a version of perl to the Macintosh
          using Think C.  It has probably been abandoned in favour of the
          MPW port, but is still available at ftp.maths.tcd.ie
          [134.266.81.10] in the directory /pub/Mac/perl-4.035/.

          Matthias Ulrich Neeracher* is working on a perl5 port to the
          Macintosh.  A PowerPC version is available at
          ftp://err.ethz.ch/pub/neeri/MacPerlBeta.

        * OS/2 sources are also available at ftp.cis.ufl.edu in
          /pub/perl/src/os2.  This appears to have been abandoned and added
          to the official distribution.  See the directory os2 in the perl5
          sources.

        * VMS systems should be able to build directly from the standard
          distribution.

        * Amiga sources are not available from ftp.cis.ufl.edu, but can
          be found at any Aminet archive, notably:
            * ftp://ftp.wustl.edu/pub/aminet/dev/lang/
            * ftp://ftp.uni-erlangen.de/pub/aminet/dev/lang/
            * ftp://ftp.doc.ic.ac.uk/pub/aminet/dev/lang/
            * ftp://ftp.funet.fi/pub/languages/perl/ports/perl4/amiga

1.17) How do I get Perl to compile on Solaris?

    The following directions are for perl, version 4.  Perl, version 5,
    should compile more easily.  If not, send mail to The Perl Porters

    John Lees* reports:

        I have built perl on Solaris 2.1, 2.2 beta, and 2.2 FCS. Take
        /usr/ucb out of your path and do not use any BSD/UCB libraries.
        Only -lsocket, -lnsl, and -lm are needed. You can use the hint for
        Solaris 2.0, but the one for 2.1 is wrong. Do not use vfork. Do not
        use -I/usr/ucbinclude.  The result works fine for me, but of couse
        does not support a couple of BSDism's.

    Casper H.S. Dik* reports

        You must remove all the references to /usr/ucblib AND
        /usr/ucbinclude.  And ignore the Solaris_2.1 hints. They are wrong.
        The undefining of vfork() probably has to do with the confusion it
        gives to the compilers.  If you use cc, you mustn't compile
        util.c/tutil.c  with -O.  I only used the following libs: -lsocket
        -lnsl -lm (there is a problem with -lmalloc)

    Michael D'Errico* reports:

        If you are using Solaris 2.x, the signal handling is broken.  If
        you set up a signal handler such as 'ripper' it will be forgotten
        after the first time the signal is caught.  To fix this, you need
        to recompile Perl.  Just add '#define signal(x,y) sigset((x),(y))'
        after the '#include <signal.h>' directive in each file that it
        occurs, then make it again.

1.18) How do I get Perl to compile on a Next?

    According to Andreas Koenig*, under NeXTstep 3.2, both perl4.036 and
    perl5.000 compile with the supplied hints file.

    However, Bill Eldridge* provides this message to help get perl4.036 on
    NeXTstep 3.0 to work:

        To get perl to compile on NeXTs, you need to combine the ANSI
        and BSD headers:

        cd /usr/include
        mkdir ansibsd
        cd ansibsd
        ln -s ../ansi
        ln -s ../bsd

        Then, follow the configuration instructions for NeXTs, *replacing*
        all mention of -I/usr/include/ansi or -I/usr/include/bsd with
        -I/usr/include/ansibsd.

1.19) What extensions are available from Perl and where can I get them?

    Some of the more popular extensions include those for windowing,
    graphics, or data base work.  Most of the major sites contain an
    archive of the extensions, usually in the ext directory.  Since the
    list of available extensions changes so often, I have opted to list
    only the sites and directories, not the individual extensions, please
    check the closest archive for more information

      ftp://ftp.cis.ufl.edu/pub/perl/ext
        (also linked at ftp://ftp.cis.ufl.edu/pub/perl/src/5.0/ext)
      ftp://ftp.khoros.unm.edu/pub/perl/extensions/
      ftp://ftp.metronet.com/pub/perlinfo/perl5/
      ftp://ftp.cs.ruu.nl/pub/PERL/perl5.0/ext
      ftp://black.ox.ac.uk/src/ALPHA/

1.20) What is dbperl and where can I get it?

    Many database-oriented extensions to Perl have been written.
    Basically, these use the usub mechanism (see the usub/ subdirectory) in
    the source distribution) to link in a database library, allowing
    embedded calls to Informix, Ingres, Interbase, Oracle and Sybase.

    Here are the authors of the various extensions:

    What            Target DB       Who
    --------        -----------     ----------------------------------------









    ? Does this one still exist?
    * Sqlperl appears to have been subsumed by Ingperl

    Buzz Moschetti* has organized a project to create a higher level
    interface to allow you to write your queries in a database-independent
    fashion.  If this type of project interests you, send mail to

    "perldb-interest" mailing lists.

    Here's a bit of advertising from Buzz:

        Perl is an interpreted language with powerful string, scalar, and
        array processing features developed by Larry Wall that "nicely
        bridges the functionality gap between sh(1) and C."  Since
        relational DB operations are typically textually oriented, perl is
        particularly well-suited to manage the data flows.  The C source
        code, which is available free of charge and runs on many platforms,
        contains a user-defined function entry point that permits a
        developer to extend the basic function set of the language.  The
        DBperl Group seeks to exploit this capability by creating a
        standardized set of perl function extensions (e.g. db_fetch(),
        db_attach()) based the SQL model for manipulating a relational DB,
        thus providing a portable perl interface to a variety of popular
        RDMS engines including Sybase, Oracle, Ingres, Informix, and
        Interbase.  In theory, any DB engine that implements a dynamic SQL
        interpreter in its HLI can be bolted onto the perl front end with
        predicatable results, although at this time backends exist only for
        the aforementioned five DB engines.

    The official archive for DBperl extensions is ftp.demon.co.uk:
    /pub/perl/db.  It's the home of the evolving DBperl API Specification.
    Here's an extract from the updated README there:

    DBI/        The home of the DBI archive. To join the DBI mailing list

    DBD/        Database Drivers for the DBI ...

    Oracle/      By Tim Bunce (not yet ready!)
    Ingres/      By Tim Bunce (not yet started!)

    mod/           Other Perl 5 Modules and Extensions ...


    perl4/         Perl 4 extensions (using the usub C interface)






       oraperl/   ORACLE 6 & 7  By Kevin Stock (sadly no longer on the net)








       duaperl/   X.500 Directory User Agent. By Eric Douglas.

    scripts/       Perl and shell scripts

       rdb/       RDB is a perl RDBMS for ASCII files. By Walt Hobbs,

       shql/      SHQL is an interactive SQL database engine.  Written as a
                    shell script, SHQL interprets SQL commands and
                    manipulates flat files based on those commands. By

       xbase/     Perl scripts for accessing xBase style files (dBase III)

   refinfo/       Reference information

       sqlsyntax/ Yacc and lex syntax and C source code for SQL1 and SQL2
            from ftp.uu.net:/pub/uunet/published/oreilly/nutshell/yacclex,

       formats/   Details of file formats such as Lotus 1-2-3 .WK1

    There are also a number of non SQL database interfaces for perl
    available from ftp.demon.co.uk.  These include:

    Directory   Target System   Authors and notes
    ---------   -------------   -------------------------------------------


    duaperl     X.500 DUA       Eric Douglas


1.21) Which DBM should I use?

    As shipped, Perl (version 5) comes with interfaces for several DBM
    packages (SDBM, old DBM, NDBM, GDBM, Berkeley DBM) that are not supplied  
    but either come with your system are readily accessible via FTP.  SDBM
    is guaranteed to be there.  For a comparison, see AnyDBM_File(3pm)
    and DB_File(3pm).

1.22) Is there an SNMP aware Perl?


    posted in late February 1993 to comp.protocols.snmp.  It can be found
    archived at one of two (known) places:

    Host liasun3.epfl.ch

        Location: /pub/net/snmp
               FILE -rw-rw-r--       3407  Aug 11 1992  snmperl.README
               FILE -rw-r--r--      17678  Aug 11 1992  snmperl.tar.Z

    Host ftp.cis.ufl.edu
        Location: /pub/perl/scripts/snmp

    Here is the gist of the README:

    README  $Revision: 2.8 $

    This directory contains the source code to add callable C subroutines
    to perl.  The subroutines implement the SNMP functions "get",
    "getnext", and "set".  They use the freely-distributable SNMP package
    (version 1.1b) from CMU.

    USE:
      There are four subroutines defined in the callable interface:
    snmp_get, snmp_next, snmp_set, and snmp_error.

      snmp_get and snmp_next implement the GET and GETNEXT operations,
    respectively.  The first two calling arguments are the hostname and
    Community string.  The IP address of the host, as a dotted-quad ASCII
    string, may be used as the hostname.  The rest of the calling
    arguments are a list of variables.  See the CMU package documentation
    for how variables may be specified.
      snmp_set also takes hostname and Community string as arguments.  The
    remaining arguments are a list of triples consisting of variable name,
    variable type, and value.  The variable type is a string, such as
    "INTEGER" or "IpAddress".
      snmp_get, snmp_next, and snmp_set return a list containing
    alternating variables and values.  snmp_get and snmp_next will simply
    omit non-existent variables on return.  snmp_set will fail completely
    if one of the specified variables does not exist (or is read-only).
      snmp_error will return a text string containing some error
    information about the most recent snmp_get|next|set call, if it had an
    error.

    OTHER NOTES:
      I didn't find all the places where the CMU library writes to stderr
    or calls exit() directly.
      The changes I made to mib.c involve the formatting of variable values
    for return to the caller.  I took out the descriptive prefix so the
    string contains only the value.
      Enumerated types are returned as a string containing the symbolic
    representation followed in parentheses by the numeric.

    DISTRIBUTION and OWNERSHIP
      perl and the CMU SNMP package have their own statements.  Read them.
    The work I've done is free and clear.  Just don't say you wrote it if
    you didn't, and don't say I wrote it if you change it.

    Guy Streeter

    April 1, 1992 (not a joke!)
--

2350 Commerce Park Drive, Suite 4                           Palm Bay, FL 32905
(407) 676-3222                                            CAD/CAM/CAE/Software



Tue, 07 Oct 1997 03:00:00 GMT  
 
 [ 1 post ] 

 Relevant Pages 

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