[30667] in Perl-Users-Digest
Perl-Users Digest, Issue: 1912 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri Oct 10 06:09:42 2008
Date: Fri, 10 Oct 2008 03:09:08 -0700 (PDT)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Fri, 10 Oct 2008 Volume: 11 Number: 1912
Today's topics:
Re: ($x == ($y or $z)) same as (($x==$y) or ($x==$z)) ? sln@netherlands.com
Re: ($x == ($y or $z)) same as (($x==$y) or ($x==$z)) ? <waveright@gmail.com>
data file <hirenshah.05@gmail.com>
Re: data file <ben@morrow.me.uk>
Re: efficient way to write multiple loops code xhoster@gmail.com
Re: efficient way to write multiple loops code <tadmc@seesig.invalid>
Re: efficient way to write multiple loops code <rvtol+news@isolution.nl>
Re: mod_perl <jcarlock@127.0.0.1>
Re: mod_perl <glex_no-spam@qwest-spam-no.invalid>
new CPAN modules on Fri Oct 10 2008 (Randal Schwartz)
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@seesig.invalid
Re: sort on multiple hash values <zhilianghu@gmail.com>
Re: sysread <rvtol+news@isolution.nl>
Re: trouble parsing "kind of" comma-delimited text sln@netherlands.com
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Thu, 09 Oct 2008 20:16:56 GMT
From: sln@netherlands.com
Subject: Re: ($x == ($y or $z)) same as (($x==$y) or ($x==$z)) ???
Message-Id: <9pose4pllhgc5sbocvgrjsie5ff9n6idng@4ax.com>
On Thu, 09 Oct 2008 11:29:15 -0400, kramer <kramer@ufl.edu> wrote:
>Thanks Ben. This is the kind of answer I was looking for. After 40
>years of programming on other languages and now picking up perl I am
>constantly surprised at how often perl somehow correctly "interprets" my
>"english" intents and gives me what I want. But not so in this case so
>I asked.
>
>Even though it looks like it would break many other things are
>"junctions" one of the per6 items I can somehow use as a feature in
>5.010 now?
>
>Your example triggered smart matches so I'll have to check to see if
>that can be bent to get what I want. All just to save a bunch of
>repetitive typing!
>
>Jack
>
>Ben Morrow wrote:
>> Quoth Jim Gibson <jimsgibson@gmail.com>:
>>> In article <gcjig4$fg3a$1@usenet.osg.ufl.edu>, kramer <kramer@ufl.edu>
>>> wrote:
>>>
>>>> I expected ($x == ($y or $z)) to return true if $x equals either $y or
>>>> $z. iow to give the same as (($x==$y) or ($x==$z)). But it doesn't.
>>>>
>>>> Why?
>>> Because Perl is not English. I can't think of any computer language
>>> that will parse '($x == ($y or $z))' as '(($x==$y) or ($x==$z));'.
>>
>> use Quantum::Superpositions;
>>
>> my ($x, $y, $z) = (1, 2, 1);
>>
>> if ($x == any($y, $z)) {
>> print "YAY!";
>> }
>>
>> This will be built in to Perl 6, where (IIRC) you will be able to write
>>
>> ($x == $y|$z)
>>
>> The concept is called 'junctions'.
>>
>> Ben
>>
Re: x == $y|$z
This is a hard one to chomp. In C++ if x were an object, all operators could
be overloaded, ie: == to take the rvalue. If y overloaded the |, it could return
an array, which gets passed to x (because x is looking for an array passed in with
its overloaded == function). But these are objects in C++, intrinsic types will obey
language. If the language is built on C++ then anything is possible.
Re: $x == any($y, $z)
This is a puzzle, a Perl guts thing.
------------------------------
Date: Thu, 9 Oct 2008 16:23:23 -0700 (PDT)
From: Todd Wade <waveright@gmail.com>
Subject: Re: ($x == ($y or $z)) same as (($x==$y) or ($x==$z)) ???
Message-Id: <e07336c4-6d8c-49ba-b6b6-5fdd910c1a1b@l42g2000hsc.googlegroups.com>
On Oct 8, 8:16 pm, kramer <kra...@ufl.edu> wrote:
> I expected ($x == ($y or $z)) to return true if $x equals either $y or
> $z. iow to give the same as (($x==$y) or ($x==$z)). But it doesn't.
>
> Why?
Here is how I would do it in stock perl:
grep $x == $_, $y, $z
As in:
if ( grep { $x == $_ } $y, $z ) {
print 'x is the same as y or z';
}
Todd W.
------------------------------
Date: Thu, 9 Oct 2008 14:59:36 -0700 (PDT)
From: "friend.05@gmail.com" <hirenshah.05@gmail.com>
Subject: data file
Message-Id: <13f78f9f-0a44-410a-a7ba-201a6c3af50c@q5g2000hsa.googlegroups.com>
I have a large file in following format:
ID | Time | IP | Code
I want only data lines which has unique IP+Code.
If IP+Code is repeated then I don't want line.
------------------------------
Date: Thu, 9 Oct 2008 23:08:05 +0100
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: data file
Message-Id: <5vb2s5-m3k.ln1@osiris.mauzo.dyndns.org>
Quoth "friend.05@gmail.com" <hirenshah.05@gmail.com>:
> I have a large file in following format:
>
> ID | Time | IP | Code
>
>
> I want only data lines which has unique IP+Code.
>
> If IP+Code is repeated then I don't want line.
perldoc -q unique
Ben
--
Musica Dei donum optimi, trahit homines, trahit deos. |
Musica truces mollit animos, tristesque mentes erigit. | ben@morrow.me.uk
Musica vel ipsas arbores et horridas movet feras. |
------------------------------
Date: 09 Oct 2008 20:50:51 GMT
From: xhoster@gmail.com
Subject: Re: efficient way to write multiple loops code
Message-Id: <20081009165054.214$62@newsreader.com>
"friend.05@gmail.com" <hirenshah.05@gmail.com> wrote:
>
> Below is my FULL Code which I am using.
It is better to post real but simplified code. Especially when
your full code is so inscrutable.
> open(INFO_P,$p_file);
> open(INFO_S,$s_file);
> open(INFO_R,$r_file);
>
> @p_lines = <INFO_P>;
> @s_lines = <INFO_S>;
As several people have said, you should use lexical file handles, you
should check the status of the open, and you should use strict.
> @r_lines = <INFO_R>;
The innermost for loop doesn't seem to do anything except for when the
if statement if(($s_cli_ip eq $r_cli_ip) && ($s_id eq $r_id))
is satisfied. Thus, that loop can be reduced to loop over only
those lines of INFO_R that will cause the above to be true. Build a hash
of arrays that segregates lines according to $r_cli_ip and $r_id.
# for reasons to be seen later:
my %r_lines;
while (<INFO_R>) {
my @res = split('\|',$r_line);
my $r_cli_ip = $res[4];
my $r_ser_ip = $res[5];
my $r_id = $res[7];
push @{$r_lines{"$r_cli_ip|$r_id"}}, $_;
};
Then replace
foreach $r_line (@r_lines)
with
foreach $r_line (@{$r_lines{"$s_cli_ip|$s_id"}})
The same strategy could perhaps be employed in the middle foreach loop
as well. If I understood the motivation of your code, I might be able
to make it much simpler, but since I don't I'll stick the "minimal possible
changes" approach.
Xho
--
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The costs of publication of this article were defrayed in part by the
payment of page charges. This article must therefore be hereby marked
advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate
this fact.
------------------------------
Date: Thu, 9 Oct 2008 20:41:46 -0500
From: Tad J McClellan <tadmc@seesig.invalid>
Subject: Re: efficient way to write multiple loops code
Message-Id: <slrngetcmq.gbv.tadmc@tadmc30.sbcglobal.net>
friend.05@gmail.com <hirenshah.05@gmail.com> wrote:
> open(INFO_P,$p_file);
You should always, yes *always*, check the return value from open():
open(INFO_P, $p_file) or die "could not open '$p_file' $!";
Even better, you should use the 3-arg form of open() and a lexical filehandle:
open my $INFO_P, '<', $p_file or die "could not open '$p_file' $!";
> @p_lines = <INFO_P>;
@p_lines = <$INFO_P>; # use the lexical filehandle
> $flag = 1;
You should choose meaningful variable names.
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.noitatibaher\100cmdat/"
------------------------------
Date: Fri, 10 Oct 2008 10:51:07 +0200
From: "Dr.Ruud" <rvtol+news@isolution.nl>
Subject: Re: efficient way to write multiple loops code
Message-Id: <gcnc7n.1ik.2@news.isolution.nl>
friend.05@gmail.com schreef:
> I am trying to analyze some data. I have big data files.
>
> I have 3 different files in following format. ($file_1, $file_2,
> $file_3)
Numbered variable names are a red flag. Normally you are better off
using a different data structure, like an array or a hash.
use strict;
use warnings;
use Data::Dumper;
$Data::Dumper::Sortkeys = $Data::Dumper::Indent =
$Data::Dumper::Terse = 1;
my %data;
my @filenames = qw/a b x/;
for my $fn (@filenames) {
open my $fh, "<", $fn or die "open $fn: $!";
while ( <$fh> ) {
my ($ip, $code) = (split m'\|')[2,3];
push @{$data{$ip}{$code}}, "$fn:$.";
}
}
print Dumper( \%data );
__END__
(untested)
--
Affijn, Ruud
"Gewoon is een tijger."
------------------------------
Date: Thu, 9 Oct 2008 17:02:35 -0400
From: "Jim Carlock" <jcarlock@127.0.0.1>
Subject: Re: mod_perl
Message-Id: <48ee716d$0$5491$9a6e19ea@unlimited.newshosting.com>
For the benefits of everyone in the Perl world.
For the benefits of all in the world of Windows.
For you, you and you too.
mod_perl gets installed as follows in the httpd.conf file (or an another
.conf file if you include such):
http://www.microcosmotalk.com/tech/mod_perl/
I need some further help in configuring security for mod_perl and Apache.
Any help, assistance or other is greatly appreciated. Thank you much well
in advance.
--
Jim Carlock
You Have More Than Five Senses
http://www.associatedcontent.com/article/381163/more_than_five_senses.html
------------------------------
Date: Thu, 09 Oct 2008 18:25:27 -0500
From: "J. Gleixner" <glex_no-spam@qwest-spam-no.invalid>
Subject: Re: mod_perl
Message-Id: <48ee92e8$0$89392$815e3792@news.qwest.net>
Jim Carlock wrote:
[...]
>
> mod_perl gets installed as follows in the httpd.conf file (or an another
> .conf file if you include such):
>
ahhh.. no.. mod_perl is configured in the httpd.conf file. If it's not
already installed, then putting things in httpd.conf won't do you any good.
>
> I need some further help in configuring security for mod_perl and Apache.
> Any help, assistance or other is greatly appreciated. Thank you much well
> in advance.
There are many sites on the Internet to help you configure your Web
server, and it's not something discussed in this newsgroup.
http://perl.apache.org/
------------------------------
Date: Fri, 10 Oct 2008 04:42:22 GMT
From: merlyn@stonehenge.com (Randal Schwartz)
Subject: new CPAN modules on Fri Oct 10 2008
Message-Id: <K8IAEM.1D9B@zorch.sf-bay.org>
The following modules have recently been added to or updated in the
Comprehensive Perl Archive Network (CPAN). You can install them using the
instructions in the 'perlmodinstall' page included with your Perl
distribution.
AI-Genetic-Pro-0.21
http://search.cpan.org/~strzelec/AI-Genetic-Pro-0.21/
Efficient genetic algorithms for professional purpose.
----
Archer-0.06
http://search.cpan.org/~tokuhirom/Archer-0.06/
yet another deployment tool
----
CGI-Application-Plugin-Routes-0.03
http://search.cpan.org/~porta/CGI-Application-Plugin-Routes-0.03/
CGI::Application::Plugin::Routes
----
CPANPLUS-YACSmoke-0.20
http://search.cpan.org/~bingos/CPANPLUS-YACSmoke-0.20/
Yet Another CPANPLUS Smoke Tester
----
Catalyst-Model-SVN-0.13
http://search.cpan.org/~bobtfish/Catalyst-Model-SVN-0.13/
Catalyst Model to browse Subversion repositories
----
Catalyst-Plugin-SmartURI-0.029
http://search.cpan.org/~rkitover/Catalyst-Plugin-SmartURI-0.029/
Configurable URIs for Catalyst
----
CatalystX-CRUD-Controller-RHTMLO-0.18
http://search.cpan.org/~karman/CatalystX-CRUD-Controller-RHTMLO-0.18/
Rose::HTML::Objects CRUD controller
----
Class-DBI-Lite-0.010_01
http://search.cpan.org/~johnd/Class-DBI-Lite-0.010_01/
Lightweight ORM for Perl
----
Class-DBI-Lite-0.010_03
http://search.cpan.org/~johnd/Class-DBI-Lite-0.010_03/
Lightweight ORM for Perl
----
Class-DBI-Lite-0.011
http://search.cpan.org/~johnd/Class-DBI-Lite-0.011/
Lightweight ORM for Perl
----
Config-JFDI-0.04
http://search.cpan.org/~rkrimen/Config-JFDI-0.04/
Just * Do it: A Catalyst::Plugin::ConfigLoader-style layer over Config::Any
----
Data-FormValidator-Filters-HTMLStrip-0.11
http://search.cpan.org/~davidb/Data-FormValidator-Filters-HTMLStrip-0.11/
Filter that removes html tags from input
----
Data-FormValidator-Filters-HTMLStrip-0.12
http://search.cpan.org/~davidb/Data-FormValidator-Filters-HTMLStrip-0.12/
Filter that removes html tags from input
----
Device-USB-0.24
http://search.cpan.org/~gwadej/Device-USB-0.24/
Use libusb to access USB devices.
----
Domain-PublicSuffix-0.04
http://search.cpan.org/~nmelnick/Domain-PublicSuffix-0.04/
Parse a domain down to root
----
Exception-Base-0.19
http://search.cpan.org/~dexter/Exception-Base-0.19/
Lightweight exceptions
----
Export-Lexical-0.0.1
http://search.cpan.org/~cgrau/Export-Lexical-0.0.1/
Lexically scoped subroutine imports
----
Export-Lexical-0.0.2
http://search.cpan.org/~cgrau/Export-Lexical-0.0.2/
Lexically scoped subroutine imports
----
File-Copy-Recursive-0.37
http://search.cpan.org/~dmuey/File-Copy-Recursive-0.37/
Perl extension for recursively copying files and directories
----
LWP-UserAgent-ProxyHopper-0.003
http://search.cpan.org/~zoffix/LWP-UserAgent-ProxyHopper-0.003/
LWP::UserAgent with proxi-hopping
----
LWP-UserAgent-ProxyHopper-Base-0.002
http://search.cpan.org/~zoffix/LWP-UserAgent-ProxyHopper-Base-0.002/
base class for LWP::UserAgent based modules which want to proxy-hop their requests
----
Mail-DWIM-0.04
http://search.cpan.org/~mschilli/Mail-DWIM-0.04/
Do-What-I-Mean Mailer
----
NCGI-0.11
http://search.cpan.org/~mlawren/NCGI-0.11/
A Common Gateway Interface (CGI) Class
----
Net-BitTorrent-0.027_004
http://search.cpan.org/~sanko/Net-BitTorrent-0.027_004/
BitTorrent peer-to-peer protocol class
----
Net-SFTP-Foreign-1.44
http://search.cpan.org/~salva/Net-SFTP-Foreign-1.44/
SSH File Transfer Protocol client
----
PAR-Filter-Squish-0.03
http://search.cpan.org/~smueller/PAR-Filter-Squish-0.03/
PAR filter for reducing code size
----
POE-Component-MessageQueue-0.2.3
http://search.cpan.org/~dsnopek/POE-Component-MessageQueue-0.2.3/
A POE message queue that uses STOMP for its communication protocol
----
POOF-1.4
http://search.cpan.org/~bmillares/POOF-1.4/
Perl extension that provides stronger typing, encapsulation and inheritance.
----
Parley-1.0.2
http://search.cpan.org/~chisel/Parley-1.0.2/
Message board / forum application
----
Parse-Eyapp-1.121
http://search.cpan.org/~casiano/Parse-Eyapp-1.121/
Extensions for Parse::Yapp
----
RTG-Report-1.15
http://search.cpan.org/~msimerson/RTG-Report-1.15/
RTG reporting and data processing utilities
----
SQL-DB-0.14
http://search.cpan.org/~mlawren/SQL-DB-0.14/
Perl interface to SQL Databases
----
SVG-Calendar-0.1.2
http://search.cpan.org/~ivanwills/SVG-Calendar-0.1.2/
Creates calendars in SVG format which can be printed
----
Schedule-At-1.08
http://search.cpan.org/~joserodr/Schedule-At-1.08/
OS independent interface to the Unix 'at' command
----
Test-Resub-1.05
http://search.cpan.org/~airwave/Test-Resub-1.05/
Lexically scoped subroutine replacement for testing
----
Test-Unit-Lite-0.1001
http://search.cpan.org/~dexter/Test-Unit-Lite-0.1001/
Unit testing without external dependencies
----
Test-Wiretap-1.01
http://search.cpan.org/~airwave/Test-Wiretap-1.01/
----
Text-Template-Simple-0.62_02
http://search.cpan.org/~burak/Text-Template-Simple-0.62_02/
Simple text template engine
----
Tree-DAG_Node-XPath-0.09
http://search.cpan.org/~mirod/Tree-DAG_Node-XPath-0.09/
Add XPath support to Tree::DAG_Node
----
URI-ParseSearchString-More-0.06
http://search.cpan.org/~oalders/URI-ParseSearchString-More-0.06/
Extract search strings from more referrers.
----
URI-ParseSearchString-More-0.07
http://search.cpan.org/~oalders/URI-ParseSearchString-More-0.07/
Extract search strings from more referrers.
----
WWW-Netflix-API-0.02
http://search.cpan.org/~davidrw/WWW-Netflix-API-0.02/
Interface for Netflix's API
----
WWW-WikiSpaces-0.01
http://search.cpan.org/~cleonty/WWW-WikiSpaces-0.01/
Perl extension to posting on WikiSpaces
----
WebService-Solr-0.02
http://search.cpan.org/~bricas/WebService-Solr-0.02/
Module to interface with the Solr (Lucene) webservice
----
XML-API-0.24
http://search.cpan.org/~mlawren/XML-API-0.24/
Perl extension for writing XML
----
XML-LibXML-SAX-ChunkParser-0.00003
http://search.cpan.org/~dmaki/XML-LibXML-SAX-ChunkParser-0.00003/
Parse XML Chunks Via LibXML SAX
----
ZConf-0.5.0
http://search.cpan.org/~vvelox/ZConf-0.5.0/
A configuration system allowing for either file or LDAP backed storage.
----
ensure-1.07
http://search.cpan.org/~gmch/ensure-1.07/
Perl extension to ensure that things, particularly subroutines, are defined before a program runs -- to avoid being bitten by Undefined subroutine &main::foo ... run-time errors.
----
ensure-1.08
http://search.cpan.org/~gmch/ensure-1.08/
Perl extension to ensure that things, particularly subroutines, are defined before a program runs -- to avoid being bitten by Undefined subroutine &main::foo ... run-time errors.
If you're an author of one of these modules, please submit a detailed
announcement to comp.lang.perl.announce, and we'll pass it along.
This message was generated by a Perl program described in my Linux
Magazine column, which can be found on-line (along with more than
200 other freely available past column articles) at
http://www.stonehenge.com/merlyn/LinuxMag/col82.html
print "Just another Perl hacker," # the original
--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
Smalltalk/Perl/Unix consulting, Technical writing, Comedy, etc. etc.
See http://methodsandmessages.vox.com/ for Smalltalk and Seaside discussion
------------------------------
Date: Fri, 10 Oct 2008 07:19:32 GMT
From: tadmc@seesig.invalid
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
Message-Id: <8mDHk.2925$as4.1596@nlpi069.nbdc.sbc.com>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
This newsgroup, commonly called clpmisc, is a technical newsgroup
intended to be used for discussion of Perl related issues (except job
postings), whether it be comments or questions.
As you would expect, clpmisc discussions are usually very technical in
nature and there are conventions for conduct in technical newsgroups
going somewhat beyond those in non-technical newsgroups.
The article at:
http://www.catb.org/~esr/faqs/smart-questions.html
describes how to get answers from technical people in general.
This article describes things that you should, and should not, do to
increase your chances of getting an answer to your Perl question. It is
available in POD, HTML and plain text formats at:
http://www.rehabitation.com/clpmisc.shtml
For more information about netiquette in general, see the "Netiquette
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http://andrew2.andrew.cmu.edu/rfc/rfc1855.html
A note to newsgroup "regulars":
Do not use these guidelines as a "license to flame" or other
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A note about technical terms used here:
In this document, we use words like "must" and "should" as
they're used in technical conversation (such as you will
encounter in this newsgroup). When we say that you *must* do
something, we mean that if you don't do that something, then
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We're not bossing you around; we're making the point without
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Do *NOT* send email to the maintainer of these guidelines. It will be
discarded unread. The guidelines belong to the newsgroup so all
discussion should appear in the newsgroup. I am just the secretary that
writes down the consensus of the group.
Before posting to comp.lang.perl.misc
Must
This section describes things that you *must* do before posting to
clpmisc, in order to maximize your chances of getting meaningful replies
to your inquiry and to avoid getting flamed for being lazy and trying to
have others do your work.
The perl distribution includes documentation that is copied to your hard
drive when you install perl. Also installed is a program for looking
things up in that (and other) documentation named 'perldoc'.
You should either find out where the docs got installed on your system,
or use perldoc to find them for you. Type "perldoc perldoc" to learn how
to use perldoc itself. Type "perldoc perl" to start reading Perl's
standard documentation.
Check the Perl Frequently Asked Questions (FAQ)
Checking the FAQ before posting is required in Big 8 newsgroups in
general, there is nothing clpmisc-specific about this requirement.
You are expected to do this in nearly all newsgroups.
You can use the "-q" switch with perldoc to do a word search of the
questions in the Perl FAQs.
Check the other standard Perl docs (*.pod)
The perl distribution comes with much more documentation than is
available for most other newsgroups, so in clpmisc you should also
see if you can find an answer in the other (non-FAQ) standard docs
before posting.
It is *not* required, or even expected, that you actually *read* all of
Perl's standard docs, only that you spend a few minutes searching them
before posting.
Try doing a word-search in the standard docs for some words/phrases
taken from your problem statement or from your very carefully worded
"Subject:" header.
Really Really Should
This section describes things that you *really should* do before posting
to clpmisc.
Lurk for a while before posting
This is very important and expected in all newsgroups. Lurking means
to monitor a newsgroup for a period to become familiar with local
customs. Each newsgroup has specific customs and rituals. Knowing
these before you participate will help avoid embarrassing social
situations. Consider yourself to be a foreigner at first!
Search a Usenet archive
There are tens of thousands of Perl programmers. It is very likely
that your question has already been asked (and answered). See if you
can find where it has already been answered.
One such searchable archive is:
http://groups.google.com/advanced_group_search
If You Like
This section describes things that you *can* do before posting to
clpmisc.
Check Other Resources
You may want to check in books or on web sites to see if you can
find the answer to your question.
But you need to consider the source of such information: there are a
lot of very poor Perl books and web sites, and several good ones
too, of course.
Posting to comp.lang.perl.misc
There can be 200 messages in clpmisc in a single day. Nobody is going to
read every article. They must decide somehow which articles they are
going to read, and which they will skip.
Your post is in competition with 199 other posts. You need to "win"
before a person who can help you will even read your question.
These sections describe how you can help keep your article from being
one of the "skipped" ones.
Is there a better place to ask your question?
Question should be about Perl, not about the application area
It can be difficult to separate out where your problem really is,
but you should make a conscious effort to post to the most
applicable newsgroup. That is, after all, where you are the most
likely to find the people who know how to answer your question.
Being able to "partition" a problem is an essential skill for
effectively troubleshooting programming problems. If you don't get
that right, you end up looking for answers in the wrong places.
It should be understood that you may not know that the root of your
problem is not Perl-related (the two most frequent ones are CGI and
Operating System related), so off-topic postings will happen from
time to time. Be gracious when someone helps you find a better place
to ask your question by pointing you to a more applicable newsgroup.
How to participate (post) in the clpmisc community
Carefully choose the contents of your Subject header
You have 40 precious characters of Subject to win out and be one of
the posts that gets read. Don't waste them. Take care while
composing them, they are the key that opens the door to getting an
answer.
Spend them indicating what aspect of Perl others will find if they
should decide to read your article.
Do not spend them indicating "experience level" (guru, newbie...).
Do not spend them pleading (please read, urgent, help!...).
Do not spend them on non-Subjects (Perl question, one-word
Subject...)
For more information on choosing a Subject see "Choosing Good
Subject Lines":
http://www.cpan.org/authors/id/D/DM/DMR/subjects.post
Part of the beauty of newsgroup dynamics, is that you can contribute
to the community with your very first post! If your choice of
Subject leads a fellow Perler to find the thread you are starting,
then even asking a question helps us all.
Use an effective followup style
When composing a followup, quote only enough text to establish the
context for the comments that you will add. Always indicate who
wrote the quoted material. Never quote an entire article. Never
quote a .signature (unless that is what you are commenting on).
Intersperse your comments *following* each section of quoted text to
which they relate. Unappreciated followup styles are referred to as
"top-posting", "Jeopardy" (because the answer comes before the
question), or "TOFU" (Text Over, Fullquote Under).
Reversing the chronology of the dialog makes it much harder to
understand (some folks won't even read it if written in that style).
For more information on quoting style, see:
http://web.presby.edu/~nnqadmin/nnq/nquote.html
Speak Perl rather than English, when possible
Perl is much more precise than natural language. Saying it in Perl
instead will avoid misunderstanding your question or problem.
Do not say: I have variable with "foo\tbar" in it.
Instead say: I have $var = "foo\tbar", or I have $var = 'foo\tbar',
or I have $var = <DATA> (and show the data line).
Ask perl to help you
You can ask perl itself to help you find common programming mistakes
by doing two things: enable warnings (perldoc warnings) and enable
"strict"ures (perldoc strict).
You should not bother the hundreds/thousands of readers of the
newsgroup without first seeing if a machine can help you find your
problem. It is demeaning to be asked to do the work of a machine. It
will annoy the readers of your article.
You can look up any of the messages that perl might issue to find
out what the message means and how to resolve the potential mistake
(perldoc perldiag). If you would like perl to look them up for you,
you can put "use diagnostics;" near the top of your program.
Do not re-type Perl code
Use copy/paste or your editor's "import" function rather than
attempting to type in your code. If you make a typo you will get
followups about your typos instead of about the question you are
trying to get answered.
Provide enough information
If you do the things in this item, you will have an Extremely Good
chance of getting people to try and help you with your problem!
These features are a really big bonus toward your question winning
out over all of the other posts that you are competing with.
First make a short (less than 20-30 lines) and *complete* program
that illustrates the problem you are having. People should be able
to run your program by copy/pasting the code from your article. (You
will find that doing this step very often reveals your problem
directly. Leading to an answer much more quickly and reliably than
posting to Usenet.)
Describe *precisely* the input to your program. Also provide example
input data for your program. If you need to show file input, use the
__DATA__ token (perldata.pod) to provide the file contents inside of
your Perl program.
Show the output (including the verbatim text of any messages) of
your program.
Describe how you want the output to be different from what you are
getting.
If you have no idea at all of how to code up your situation, be sure
to at least describe the 2 things that you *do* know: input and
desired output.
Do not provide too much information
Do not just post your entire program for debugging. Most especially
do not post someone *else's* entire program.
Do not post binaries, HTML, or MIME
clpmisc is a text only newsgroup. If you have images or binaries
that explain your question, put them in a publically accessible
place (like a Web server) and provide a pointer to that location. If
you include code, cut and paste it directly in the message body.
Don't attach anything to the message. Don't post vcards or HTML.
Many people (and even some Usenet servers) will automatically filter
out such messages. Many people will not be able to easily read your
post. Plain text is something everyone can read.
Social faux pas to avoid
The first two below are symptoms of lots of FAQ asking here in clpmisc.
It happens so often that folks will assume that it is happening yet
again. If you have looked but not found, or found but didn't understand
the docs, say so in your article.
Asking a Frequently Asked Question
It should be understood that you may have missed the applicable FAQ
when you checked, which is not a big deal. But if the Frequently
Asked Question is worded similar to your question, folks will assume
that you did not look at all. Don't become indignant at pointers to
the FAQ, particularly if it solves your problem.
Asking a question easily answered by a cursory doc search
If folks think you have not even tried the obvious step of reading
the docs applicable to your problem, they are likely to become
annoyed.
If you are flamed for not checking when you *did* check, then just
shrug it off (and take the answer that you got).
Asking for emailed answers
Emailed answers benefit one person. Posted answers benefit the
entire community. If folks can take the time to answer your
question, then you can take the time to go get the answer in the
same place where you asked the question.
It is OK to ask for a *copy* of the answer to be emailed, but many
will ignore such requests anyway. If you munge your address, you
should never expect (or ask) to get email in response to a Usenet
post.
Ask the question here, get the answer here (maybe).
Beware of saying "doesn't work"
This is a "red flag" phrase. If you find yourself writing that,
pause and see if you can't describe what is not working without
saying "doesn't work". That is, describe how it is not what you
want.
Sending a "stealth" Cc copy
A "stealth Cc" is when you both email and post a reply without
indicating *in the body* that you are doing so.
Be extra cautious when you get upset
Count to ten before composing a followup when you are upset
This is recommended in all Usenet newsgroups. Here in clpmisc, most
flaming sub-threads are not about any feature of Perl at all! They
are most often for what was seen as a breach of netiquette. If you
have lurked for a bit, then you will know what is expected and won't
make such posts in the first place.
But if you get upset, wait a while before writing your followup. I
recommend waiting at least 30 minutes.
Count to ten after composing and before posting when you are upset
After you have written your followup, wait *another* 30 minutes
before committing yourself by posting it. You cannot take it back
once it has been said.
AUTHOR
Tad McClellan and many others on the comp.lang.perl.misc newsgroup.
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.noitatibaher\100cmdat/"
------------------------------
Date: Thu, 9 Oct 2008 16:21:29 -0700 (PDT)
From: Zhiliang Hu <zhilianghu@gmail.com>
Subject: Re: sort on multiple hash values
Message-Id: <beb098c3-6416-4197-8e81-6154096678e8@o40g2000prn.googlegroups.com>
Sorry I must be in day-dreaming for these errors.
Any way I changed my approach to have solved the problem. John's
suggestion to use a hash of arrays is a good idea for the problem
though (another evidence to see multiple ways to accomplish
something!)
Thanks for all the replies.
Zhiliang
------------------------------
Date: Fri, 10 Oct 2008 11:03:31 +0200
From: "Dr.Ruud" <rvtol+news@isolution.nl>
Subject: Re: sysread
Message-Id: <gcncql.1ig.2@news.isolution.nl>
Larry schreef:
> what I am trying to do is:
>
> if ( $io->fdopen(fileno(STDIN),"r") )
> {
> while($io->read(my $buf, 1024))
> {
> # ...deal with $buf...
> }
> $io->close;
> }
{ local $/ = \1024;
while ( <> ) {
# ... deal with $_
}
}
--
Affijn, Ruud
"Gewoon is een tijger."
------------------------------
Date: Thu, 09 Oct 2008 20:18:50 GMT
From: sln@netherlands.com
Subject: Re: trouble parsing "kind of" comma-delimited text
Message-Id: <lqkse4prg9kb59ug6gov2inl25fmv1kjta@4ax.com>
On Sat, 04 Oct 2008 20:24:42 GMT, sln@netherlands.com wrote:
>On Fri, 03 Oct 2008 13:37:01 -0400, nun <junk@yahoo.com> wrote:
>
>>I need to process a text file of product data that's supplied to me by a
>>vendor. This data is "kind of" comma-delimited.... some of the rows
>>contain commas within the "description" field, and in these cases (and
>>only in these cases) that field's data is enclosed by double quotes.
>>Here is some sample data:
>>
>>SKU,DESCRIPTION,PRICE
>>12345,CABLE,21.25
>>56789,"CONNECTOR, LARGE",13.50
>>
>>Rows which do not have the double-quote-enclosed comma issue can be
>>processed correctly using this code:
>>
>>#################################
>># reading data in from file
>>my (@AoA);
>> while ( <> ) {
>
> my @tmpa = ();
> while (/"+\s*([^"]*?)\s*"+|\s*([^,\n]+)\s*/g) # trims
^^ /\s*"+\s*([^"]*?)\s*"+\s*|\s*([^,\n]+)\s*/g
^
if the leading \s is not there, [^,\n] will hog before it gets to the
first double quote.
this will only happen on the very first ' "...",' entry.
> {
> my $val = defined $1 ? $1 : $2;
> push @tmpa, $val;
> }
> push @AoA, \@tmpa;
>
> # or ...
>
> push @AoA, [(/("+[^"]*?"+|[^,\n]+)/g)]; # does not trim
>> }
>>#################################
>>
>>but of course the rows which do have that issue don't parse as desired.
>>
>>So far I've been unable to come up with a good way to handle this, so I
>>thought I'd ask for suggestions from the gurus. Any ideas would be
>>appreciated.
>>
>>DB
>
>If you don't want to bring in a bunch of code, do it the easy way.
>sln
>
>
>use strict;
>use warnings;
>
>my $str = '
>SKU,DESCRIPTION,PRICE
>12345, CABLE , 21.25
>56789,"CONNECTOR, LARGE"",13.50
>';
>
>
>while ($str =~ /("+[^"]*?"+|[^,\n]+)/g)
>{
> my $val = $1;
> $val =~ s/^[\s'"]+//; $val =~ s/[\s'"]+$//;
> print "val_a = $val\n";
> # ... push @ary, $val;
>}
>print "\n\n\n";
>
>## or ...
>
>while ($str =~ /"+\s*([^"]*?)\s*"+|\s*([^,\n]+)\s*/g)
>{
> my $val = defined $1 ? $1 : $2;
> print "val_b = $val\n";
> # ... push @ary, $val;
>}
>
>print "\n\n\n";
>
>## or ...
>
>my @ary = ($str =~ /("+[^"]*?"+|[^,\n]+)/g); # but gets all the crap as well
>
>print "@ary\n";
>
>__END__
>
>output:
>
>val_a = SKU
>val_a = DESCRIPTION
>val_a = PRICE
>val_a = 12345
>val_a = CABLE
>val_a = 21.25
>val_a = 56789
>val_a = CONNECTOR, LARGE
>val_a = 13.50
>
>
>
>val_b = SKU
>val_b = DESCRIPTION
>val_b = PRICE
>val_b = 12345
>val_b = CABLE
>val_b = 21.25
>val_b = 56789
>val_b = CONNECTOR, LARGE
>val_b = 13.50
>
>
>
>SKU DESCRIPTION PRICE 12345 CABLE 21.25 56789 "CONNECTOR, LARGE"" 13.50
>
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
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------------------------------
End of Perl-Users Digest V11 Issue 1912
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