[24692] in Perl-Users-Digest
Perl-Users Digest, Issue: 6851 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Tue Aug 10 06:05:55 2004
Date: Tue, 10 Aug 2004 03:05:08 -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 Tue, 10 Aug 2004 Volume: 10 Number: 6851
Today's topics:
Can somebody explain? (Vittal)
Re: Can somebody explain? <noreply@gunnar.cc>
Re: Can somebody explain? <nobull@mail.com>
catch error code from system() (justme)
Re: catch error code from system() <sholden@flexal.cs.usyd.edu.au>
Re: catch error code from system() <mritty@gmail.com>
Re: catch error code from system() <jurgenex@hotmail.com>
Re: checking effective file permissions <xx087@freenet.carleton.ca>
Expression Problem <Some.One@hotmail.com>
Re: Expression Problem <bernard.el-haginDODGE_THIS@lido-tech.net>
Re: Expression Problem (Anno Siegel)
Re: Expression Problem <Paul.Gaborit@invalid.invalid>
Re: Expression Problem <sholden@flexal.cs.usyd.edu.au>
Re: Expression Problem <tassilo.von.parseval@rwth-aachen.de>
Re: Expression Problem <bernard.el-haginDODGE_THIS@lido-tech.net>
Re: Expression Problem <bernard.el-haginDODGE_THIS@lido-tech.net>
Re: Expression Problem <gnari@simnet.is>
Re: Expression Problem <bernard.el-haginDODGE_THIS@lido-tech.net>
Re: Joining 2 strings <tadmc@augustmail.com>
Re: Newbie problem with perl and rsh (zenshade)
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@augustmail.com
Re: Statistics for comp.lang.perl.misc <mr@sandman.net>
Re: Statistics for comp.lang.perl.misc <mr@sandman.net>
Re: Statistics for comp.lang.perl.misc <abigail@abigail.nl>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: 10 Aug 2004 00:27:49 -0700
From: vsnadagouda@yahoo.com (Vittal)
Subject: Can somebody explain?
Message-Id: <f9dcc290.0408092327.b0120e6@posting.google.com>
Hello All,
I am new to Perl and I have been going through some of the perl code.
In one of the file I found the following snippet:
$temp = qr{
\(
(?:
(?>[^()]+ )
|
(??{ $temp })
)*
\)
}x;
$cchat = qr/((\W)?(\*?\*?\w+)\s*($temp))/;
Can somebody explain me what these two lines do?
Thanks
-Vittal
------------------------------
Date: Tue, 10 Aug 2004 09:43:24 +0200
From: Gunnar Hjalmarsson <noreply@gunnar.cc>
Subject: Re: Can somebody explain?
Message-Id: <2nrcllF3q4uhU1@uni-berlin.de>
Vittal wrote:
> In one of the file I found the following snippet:
>
> $temp = qr{
> \(
> (?:
> (?>[^()]+ )
> |
> (??{ $temp })
> )*
> \)
> }x;
>
> $cchat = qr/((\W)?(\*?\*?\w+)\s*($temp))/;
>
> Can somebody explain me what these two lines do?
Can't you read the explanation in the file where you found the code?
Just a thought.
Otherwise, the first (and the most complicated) part, is explained in
"perldoc perlre":
http://www.perldoc.com/perl5.8.4/pod/perlre.html#(--%7b-code-%7d)
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
------------------------------
Date: Tue, 10 Aug 2004 09:02:06 +0100
From: Brian McCauley <nobull@mail.com>
Subject: Re: Can somebody explain?
Message-Id: <cf9v5t$o8$1@sun3.bham.ac.uk>
Vittal wrote:
> I am new to Perl and I have been going through some of the perl code.
>
> In one of the file I found the following snippet:
>
> $temp = qr{
> \(
> (?:
> (?>[^()]+ )
> |
> (??{ $temp })
> )*
> \)
> }x;
This defines a precompiled regex such that pattern /$temp/ will match a
string starting with a '(' and ending at the _matching_ ')'. (i.e.
there can be any number of nested (...) in between).
To understand why you'd have to understand the (??{...}) (?:...) and
(?>...) regex constructs these are explained better in 'perlre' than I
could do. So look there.
The qr// operator is used to define precompiled regex and is documented
in perlop. (Note as with any quoute-like operator in Perl the so called
qr// operator can use alternate delimiters so can also be qr{}).
The /x regex qualifier on the end of the qr// makes unqouted whitespace
inside the regex non-significant so allows the regex to be laid out more
readably.
> $cchat = qr/((\W)?(\*?\*?\w+)\s*($temp))/;
This defines another pre-complied regex that matches something followed
by a ballenced (...).
The "something" is rather odd but there's no point trying to explain it.
All I'd be doing it telling you what each of the constructs mean.
Much better to just look up the constructs used in perlre. If there's
something you don't understand then come back and say what it is that
you don't understand.
------------------------------
Date: 9 Aug 2004 19:30:40 -0700
From: eight02645999@yahoo.com (justme)
Subject: catch error code from system()
Message-Id: <c0837966.0408091830.5b738121@posting.google.com>
hi
i wrote a perl script that is supposed to run a java program.
my $cmd ="/usr/bin/java javaprog";
system($cmd);
the java prog returns an error code if there is an error when the java prog runs
how can i catch the return code of the java prog reliably ?
thanks
------------------------------
Date: 10 Aug 2004 02:33:10 GMT
From: Sam Holden <sholden@flexal.cs.usyd.edu.au>
Subject: Re: catch error code from system()
Message-Id: <slrnchgcv6.566.sholden@flexal.cs.usyd.edu.au>
On 9 Aug 2004 19:30:40 -0700, justme <eight02645999@yahoo.com> wrote:
> hi
>
> i wrote a perl script that is supposed to run a java program.
>
> my $cmd ="/usr/bin/java javaprog";
> system($cmd);
>
> the java prog returns an error code if there is an error when the java prog runs
> how can i catch the return code of the java prog reliably ?
> thanks
What does the documentation for the perl system function say?
--
Sam Holden
------------------------------
Date: Mon, 9 Aug 2004 23:02:49 -0400
From: Paul Lalli <mritty@gmail.com>
Subject: Re: catch error code from system()
Message-Id: <20040809230150.Q4433@barbara.cs.rpi.edu>
On Mon, 9 Aug 2004, justme wrote:
> hi
>
> i wrote a perl script that is supposed to run a java program.
>
> my $cmd ="/usr/bin/java javaprog";
> system($cmd);
>
> the java prog returns an error code if there is an error when the java prog runs
> how can i catch the return code of the java prog reliably ?
> thanks
Uhm, by not throwing away the return value from system?
my $retval = system($cmd);
(note that one more step is actually needed. Read
perldoc -f system
for more info)
Paul Lalli
------------------------------
Date: Tue, 10 Aug 2004 03:38:14 GMT
From: "Jürgen Exner" <jurgenex@hotmail.com>
Subject: Re: catch error code from system()
Message-Id: <GqXRc.18423$114.7145@nwrddc02.gnilink.net>
justme wrote:
> i wrote a perl script that is supposed to run a java program.
>
> my $cmd ="/usr/bin/java javaprog";
> system($cmd);
>
> the java prog returns an error code if there is an error when the
> java prog runs how can i catch the return code of the java prog
> reliably ? thanks
Please provide a complete but minimal program that demonstrates that the
method described in the documentation for system() doesn't work.
Then people will sure be happy to investigate.
jue
------------------------------
Date: 10 Aug 2004 01:06:51 GMT
From: Glenn Jackman <xx087@freenet.carleton.ca>
Subject: Re: checking effective file permissions
Message-Id: <slrnchg7tb.gb.xx087@smeagol.ncf.ca>
At 2004-08-09 04:38PM, David K. Wall <dwall@fastmail.fm> wrote:
[...]
> my $perm = (-r $file ? 'r' : '-')
> . (-w $file ? 'w' : '-')
> . (-x $file ? 'x' : '-');
Note that that will stat the file 3 times. More efficient is to use "_",
the buffer of the most recent stat:
my $perm = (-r $file ? 'r' : '-')
. (-w _ ? 'w' : '-')
. (-x _ ? 'x' : '-');
--
Glenn Jackman
NCF Sysadmin
glennj@ncf.ca
------------------------------
Date: Tue, 10 Aug 2004 07:56:38 GMT
From: Noname <Some.One@hotmail.com>
Subject: Expression Problem
Message-Id: <Wc%Rc.22142$g4.418525@news2.nokia.com>
Hi,
I have input from STDIN like $Input="1-5,6,8,10-15";
which actually needs to be interpreted as an
array=1,2,3,4,5,6,8,10,11,12,13,14,15
how can it be done,
------------------------------
Date: Tue, 10 Aug 2004 10:07:54 +0200
From: "Bernard El-Hagin" <bernard.el-haginDODGE_THIS@lido-tech.net>
Subject: Re: Expression Problem
Message-Id: <Xns95416783DCA6Delhber1lidotechnet@62.89.127.66>
Noname <Some.One@hotmail.com> wrote:
> Hi,
> I have input from STDIN like $Input="1-5,6,8,10-15";
> which actually needs to be interpreted as an
> array=1,2,3,4,5,6,8,10,11,12,13,14,15
> how can it be done,
my @array = map { s/-/../; eval } split /,/, $Input;
--
Cheers,
Bernard
------------------------------
Date: 10 Aug 2004 08:13:32 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: Expression Problem
Message-Id: <cfa03c$f54$1@mamenchi.zrz.TU-Berlin.DE>
Noname <Some.One@hotmail.com> wrote in comp.lang.perl.misc:
> Hi,
> I have input from STDIN like $Input="1-5,6,8,10-15";
> which actually needs to be interpreted as an
> array=1,2,3,4,5,6,8,10,11,12,13,14,15
> how can it be done,
map /(\d+)-(\d+)/ ? $1 .. $2 : $_, split /,/, $Input;
Anno
------------------------------
Date: Tue, 10 Aug 2004 10:27:39 +0200
From: Paul GABORIT <Paul.Gaborit@invalid.invalid>
Subject: Re: Expression Problem
Message-Id: <r7vffr5res.fsf@michelange.enstimac.fr>
À (at) Tue, 10 Aug 2004 07:56:38 GMT,
Noname <Some.One@hotmail.com> écrivait (wrote):
> I have input from STDIN like $Input="1-5,6,8,10-15";
> which actually needs to be interpreted as an
> array=1,2,3,4,5,6,8,10,11,12,13,14,15
> how can it be done,
my @array = map {m/(.*)-(.*)/?($1..$2):$_} split ',', $Input;
--
Paul Gaborit - <http://www.enstimac.fr/~gaborit/>
Perl en français - <http://www.enstimac.fr/Perl/>
------------------------------
Date: 10 Aug 2004 08:30:37 GMT
From: Sam Holden <sholden@flexal.cs.usyd.edu.au>
Subject: Re: Expression Problem
Message-Id: <slrnchh1td.9bs.sholden@flexal.cs.usyd.edu.au>
On Tue, 10 Aug 2004 10:07:54 +0200,
Bernard El-Hagin <bernard.el-haginDODGE_THIS@lido-tech.net> wrote:
> Noname <Some.One@hotmail.com> wrote:
>
>> Hi,
>> I have input from STDIN like $Input="1-5,6,8,10-15";
>> which actually needs to be interpreted as an
>> array=1,2,3,4,5,6,8,10,11,12,13,14,15
>> how can it be done,
>
>
> my @array = map { s/-/../; eval } split /,/, $Input;
evaling arbitrary text from STDIN isn't always a great idea. Sometimes
it is - but the in all those cases the user would be told that perl
expressions were expected...
Something like:
my @array = map {/^(\d+)-(\d+)$/?($1..$2):$_} split /,/, $Input;
would be a little safer.
--
Sam Holden
------------------------------
Date: Tue, 10 Aug 2004 10:33:50 +0200
From: "Tassilo v. Parseval" <tassilo.von.parseval@rwth-aachen.de>
Subject: Re: Expression Problem
Message-Id: <2nrfjgF3omb8U1@uni-berlin.de>
Also sprach Bernard El-Hagin:
> Noname <Some.One@hotmail.com> wrote:
>
>> Hi,
>> I have input from STDIN like $Input="1-5,6,8,10-15";
>> which actually needs to be interpreted as an
>> array=1,2,3,4,5,6,8,10,11,12,13,14,15
>> how can it be done,
>
>
> my @array = map { s/-/../; eval } split /,/, $Input;
Heh, cool. The split() isn't necessary, though:
my @array = map { s/-/../g; eval } $Input;
Tassilo
--
$_=q#",}])!JAPH!qq(tsuJ[{@"tnirp}3..0}_$;//::niam/s~=)]3[))_$-3(rellac(=_$({
pam{rekcahbus})(rekcah{lrePbus})(lreP{rehtonabus})!JAPH!qq(rehtona{tsuJbus#;
$_=reverse,s+(?<=sub).+q#q!'"qq.\t$&."'!#+sexisexiixesixeseg;y~\n~~dddd;eval
------------------------------
Date: Tue, 10 Aug 2004 10:44:54 +0200
From: "Bernard El-Hagin" <bernard.el-haginDODGE_THIS@lido-tech.net>
Subject: Re: Expression Problem
Message-Id: <Xns95416DC9BF05elhber1lidotechnet@62.89.127.66>
Sam Holden <sholden@flexal.cs.usyd.edu.au> wrote:
> On Tue, 10 Aug 2004 10:07:54 +0200,
> Bernard El-Hagin <bernard.el-haginDODGE_THIS@lido-tech.net>
> wrote:
>> Noname <Some.One@hotmail.com> wrote:
>>
>>> Hi,
>>> I have input from STDIN like $Input="1-5,6,8,10-15";
>>> which actually needs to be interpreted as an
>>> array=1,2,3,4,5,6,8,10,11,12,13,14,15
>>> how can it be done,
>>
>>
>> my @array = map { s/-/../; eval } split /,/, $Input;
>
> evaling arbitrary text from STDIN isn't always a great idea.
Never said it was. But I couldn't resist the "coolness" factor of that
solution. ;-)
> Sometimes it is - but the in all those cases the user would be
> told that perl expressions were expected...
>
> Something like:
>
> my @array = map {/^(\d+)-(\d+)$/?($1..$2):$_} split /,/, $Input;
>
> would be a little safer.
Yeah, that was my first attempt, but then my evil side took over. :)
--
Cheers,
Bernard
------------------------------
Date: Tue, 10 Aug 2004 10:48:01 +0200
From: "Bernard El-Hagin" <bernard.el-haginDODGE_THIS@lido-tech.net>
Subject: Re: Expression Problem
Message-Id: <Xns95416E510E0B5elhber1lidotechnet@62.89.127.66>
"Tassilo v. Parseval" <tassilo.von.parseval@rwth-aachen.de> wrote:
> Also sprach Bernard El-Hagin:
>
>> Noname <Some.One@hotmail.com> wrote:
>>
>>> Hi,
>>> I have input from STDIN like $Input="1-5,6,8,10-15";
>>> which actually needs to be interpreted as an
>>> array=1,2,3,4,5,6,8,10,11,12,13,14,15
>>> how can it be done,
>>
>>
>> my @array = map { s/-/../; eval } split /,/, $Input;
>
> Heh, cool. The split() isn't necessary, though:
>
> my @array = map { s/-/../g; eval } $Input;
Quite correct. The split remained from other solutions I tried and I
didn't even think that this could work without it. Thanks!
--
Cheers,
Bernard
------------------------------
Date: Tue, 10 Aug 2004 08:44:33 -0000
From: "gnari" <gnari@simnet.is>
Subject: Re: Expression Problem
Message-Id: <cfa1pg$c4t$1@news.simnet.is>
"Bernard El-Hagin" <bernard.el-haginDODGE_THIS@lido-tech.net> wrote in
message news:Xns95416783DCA6Delhber1lidotechnet@62.89.127.66...
> Noname <Some.One@hotmail.com> wrote:
>
> > Hi,
> > I have input from STDIN like $Input="1-5,6,8,10-15";
> > which actually needs to be interpreted as an
> > array=1,2,3,4,5,6,8,10,11,12,13,14,15
> > how can it be done,
>
>
> my @array = map { s/-/../; eval } split /,/, $Input;
please do not do this unless you trust the input 100% to
be in the format described.
malicious input (or a mistake) can result in arbitrary code
execution. (think rm -R /)
gnari
------------------------------
Date: Tue, 10 Aug 2004 11:23:24 +0200
From: "Bernard El-Hagin" <bernard.el-haginDODGE_THIS@lido-tech.net>
Subject: Re: Expression Problem
Message-Id: <Xns954174513BF97elhber1lidotechnet@62.89.127.66>
"gnari" <gnari@simnet.is> wrote:
> "Bernard El-Hagin" <bernard.el-haginDODGE_THIS@lido-tech.net>
> wrote in message
> news:Xns95416783DCA6Delhber1lidotechnet@62.89.127.66...
>> Noname <Some.One@hotmail.com> wrote:
>>
>> > Hi,
>> > I have input from STDIN like $Input="1-5,6,8,10-15";
>> > which actually needs to be interpreted as an
>> > array=1,2,3,4,5,6,8,10,11,12,13,14,15
>> > how can it be done,
>>
>>
>> my @array = map { s/-/../; eval } split /,/, $Input;
>
>
> please do not do this unless you trust the input 100% to
> be in the format described.
>
> malicious input (or a mistake) can result in arbitrary code
> execution. (think rm -R /)
That would result in evaling "rm ..R /". ;-)
--
Cheers,
Bernard
------------------------------
Date: Mon, 9 Aug 2004 21:27:13 -0500
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: Joining 2 strings
Message-Id: <slrnchgck1.2ld.tadmc@magna.augustmail.com>
Sim <selena_kid@yahoo.com> wrote:
> The aim of the program is to
> 1. Format the data such that 3 lines (containing the information about
> a single record) are displayed as a single line with no overwriting.
> 1. I cannot join/ append the 3 lines on a single line.
I can:
------------------------------------------
#!/usr/bin/perl
use warnings;
use strict;
my $line1 = "first line\n";
my $line2 = "second line\n";
my $line3 = "third line\n";
chomp $line1;
chomp $line2;
my $single_line = "$line1$line2$line3";
print $single_line;
------------------------------------------
> Please advise on:
> Problem #1 in particular, and
Show us a short and complete program that we can run, including
the data, and we will help you fix it.
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: 10 Aug 2004 00:02:33 -0700
From: zenshade@wowway.com (zenshade)
Subject: Re: Newbie problem with perl and rsh
Message-Id: <76a99d19.0408092302.27a247d6@posting.google.com>
Tad McClellan <tadmc@augustmail.com> wrote in message news:<slrncheti2.7c0.tadmc@magna.augustmail.com>...
> zenshade <zenshade@wowway.com> wrote:
> > Brian McCauley <nobull@mail.com> wrote in message news:<cf5rk1$lt9$1@slavica.ukpost.com>...
> >
> >> I council you not to use the word "newbie" in subject lines - it tends
> >> to predispose people against you...
>
> >> Your problem has nothing to do with rsh. Had you tried replacing 'rsh'
> >> with 'echo' you'd have found the problem persisted. This process is
> >> known as "problem partitioning". It is an absolutely vital skill in
> >> programming. If you think your problems lies elsewhere than it does
> >> then you are unlikely to find a solution.
> >
> > Let N be the number of lines in your response. Subtract one. N - 1
> > is the number of unnecessary lines in your post.
>
>
> Actually, N is the number of unnecessary lines in the post.
>
> It is not necessary that you get _any_ answers at all.
>
>
> > Your points are well taken and
>
>
> You seem to have a strange definition of the phrase "well taken"...
>
>
> > comes a point where I'd much sooner just tell a great lot of people to
> > piss off than put up with their snobbery and finicky, nit-picky
> > notions of what and how Usenet is to be used.
>
>
> So, you have lurked here for some time already, and know
> what is expected here?
>
> If so, then why did you not do what is expected?
>
>
> > Seriously, though, thanks for mentioning the linefeed. That's exactly
> > the type of response I was looking for.
>
>
> The probability of getting answers to future Perl questions
> has been greatly diminished by the content of your followup.
>
> Hope it made you feel better.
My sincere apology if I have given offense. Having reread my post and
the responses, I realize what an ignorant, insensitive lout I have
appeared to be. That was not at all my intention. Of course I was
being lazy. And Brian McCauley was certainly justified in calling me
out on it.
I am but a toad, and do truly appreciate any crumbs of true wisdom
that may be tossed my way.
Humbly Yours,
zenshade
------------------------------
Date: Tue, 10 Aug 2004 02:22:25 -0500
From: tadmc@augustmail.com
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.5 $)
Message-Id: <vNedncNGuO4s6oXcRVn-pw@august.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.5 $)
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://mail.augustmail.com/~tadmc/clpmisc.shtml
For more information about netiquette in general, see the "Netiquette
Guidelines" at:
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
meanness. It is possible that a poster is unaware of things
discussed here. Give them the benefit of the doubt, and just
help them learn how to post, rather than assume
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
it's unlikely that you will benefit much from this group.
We're not bossing you around; we're making the point without
lots of words.
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 <tadmc@augustmail.com> and many others on the
comp.lang.perl.misc newsgroup.
------------------------------
Date: Tue, 10 Aug 2004 08:13:51 +0200
From: Sandman <mr@sandman.net>
Subject: Re: Statistics for comp.lang.perl.misc
Message-Id: <mr-8C328D.08135110082004@individual.net>
In article <FMURc.4264$l96.3855@nwrddc04.gnilink.net>,
"Jürgen Exner" <jurgenex@hotmail.com> wrote:
> Sandman wrote:
> > In article <10hev88pvh1to9b@corp.supernews.com>,
> > Greg Bacon <gbacon@hiwaay.net> wrote:
> >
> >> Following is a summary of articles spanning a 7 day period,
> >> beginning at 02 Aug 2004 13:41:47 GMT and ending at
> >> 09 Aug 2004 13:08:30 GMT.
> >
> > Hello Greg - I posted a question about News::Scan in an earlier post.
> > WOuld it be too much trouble to ask you to just see if it's an easy
> > answer?
>
> Are you requesting that you should be listed in the posting statistics
> because you asked this question?
Eh...no?
--
Sandman[.net]
------------------------------
Date: Tue, 10 Aug 2004 08:15:42 +0200
From: Sandman <mr@sandman.net>
Subject: Re: Statistics for comp.lang.perl.misc
Message-Id: <mr-308F5B.08154210082004@individual.net>
In article <slrnchfovc.1qj.tadmc@magna.augustmail.com>,
Tad McClellan <tadmc@augustmail.com> wrote:
> Sandman <mr@sandman.net> wrote:
> > In article <10hev88pvh1to9b@corp.supernews.com>,
> > Greg Bacon <gbacon@hiwaay.net> wrote:
> >
> >> Following is a summary of articles spanning a 7 day period,
>
> > I posted a question about News::Scan in an earlier post.
>
>
> What does your question have to do with the statistics
> for comp.lang.perl.misc?
1. It concerns News::Scan, the modules used to generate the statistics.
2. It is directed at Greg, the author of News::Scan, and the author of
the statistics.
Maybe he has an automatic newsmailer for these statistics and no longer read
the group, though.
--
Sandman[.net]
------------------------------
Date: 10 Aug 2004 07:53:46 GMT
From: Abigail <abigail@abigail.nl>
Subject: Re: Statistics for comp.lang.perl.misc
Message-Id: <slrnchgvoa.ec9.abigail@alexandra.abigail.nl>
Sandman (mr@sandman.net) wrote on MMMCMXCVII September MCMXCIII in
<URL:news:mr-308F5B.08154210082004@individual.net>:
;; In article <slrnchfovc.1qj.tadmc@magna.augustmail.com>,
;; Tad McClellan <tadmc@augustmail.com> wrote:
;;
;; > Sandman <mr@sandman.net> wrote:
;; > > In article <10hev88pvh1to9b@corp.supernews.com>,
;; > > Greg Bacon <gbacon@hiwaay.net> wrote:
;; > >
;; > >> Following is a summary of articles spanning a 7 day period,
;; >
;; > > I posted a question about News::Scan in an earlier post.
;; >
;; >
;; > What does your question have to do with the statistics
;; > for comp.lang.perl.misc?
;;
;; 1. It concerns News::Scan, the modules used to generate the statistics.
Yes, and?
;; 2. It is directed at Greg, the author of News::Scan, and the author of
;; the statistics.
That's what email is for.
;; Maybe he has an automatic newsmailer for these statistics and no longer rea
;; the group, though.
Nah, he types in the statistics entirely by hand. It takes him a week to
do it, and that's why he can't answer any other questions.
Abigail
--
perl -wlpe '}$_=$.;{' file # Count the number of lines.
------------------------------
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>
Administrivia:
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------------------------------
End of Perl-Users Digest V10 Issue 6851
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