[23425] in Perl-Users-Digest
Perl-Users Digest, Issue: 5642 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri Oct 10 06:05:40 2003
Date: Fri, 10 Oct 2003 03:05:06 -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 2003 Volume: 10 Number: 5642
Today's topics:
Re: data manipulation <noreply@gunnar.cc>
Re: data manipulation <bNOoONb@not.pilbara.net.au>
Re: data manipulation <noreply@gunnar.cc>
Efficient field splitting? unpack or substr (ifiaz)
Re: Efficient field splitting? unpack or substr <jwillmore@remove.adelphia.net>
Re: Efficient field splitting? unpack or substr <grazz@pobox.com>
Error returned while invoking a ".exe" from a perl scri (Haresh)
Re: Error returned while invoking a ".exe" from a perl <bernard.el-haginDODGE_THIS@lido-tech.net>
Re: How To activate command line history in debugger? <kurt.kronschnabl-nospam@ica-intercom-akademie.de>
Perl Hash Performance <gah205@nyu.edu>
Re: Perl Hash Performance (Anno Siegel)
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@augustmail.com
tree drawing toolkit <peter@semantico.com>
Re: trying to understand a hash - understanding has occ nobull@mail.com
Re: <bwalton@rochester.rr.com>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Fri, 10 Oct 2003 07:16:24 +0200
From: Gunnar Hjalmarsson <noreply@gunnar.cc>
Subject: Re: data manipulation
Message-Id: <bm5fel$j9uep$1@ID-184292.news.uni-berlin.de>
Bob wrote:
>
> -> push @chunks, $chunk if $chunk;
> -> $chunk = '';
>
> After reading the push function description from "learning Perl" I
> am failing to understand exactly what is happening here.
It adds an element to the array @chunks with what's been stored in
$chunk from previous iterations, and then it empties $chunk.
The line
push @chunks, $chunk if $chunk;
can also be written
if ($chunk) {
push @chunks, $chunk;
}
My suggestion means that the whole log file ends up in memory in the
array @chunks. I thought that made the code easier to understand, but
it should be noted that if the log file is really big, it's not a good
approach. In that case, you'd better do in the loop with respective
'generation' of $chunk whatever you want to do with it, and refrain
from storing the whole file in an array.
HTH
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
------------------------------
Date: Fri, 10 Oct 2003 16:08:56 +0930
From: "Bob" <bNOoONb@not.pilbara.net.au>
Subject: Re: data manipulation
Message-Id: <bm5kbo$hcd$1@mws-stat-syd.cdn.telstra.com.au>
"Gunnar Hjalmarsson" <noreply@gunnar.cc> wrote in message
news:bm5fel$j9uep$1@ID-184292.news.uni-berlin.de...
> Bob wrote:
> >
> > -> push @chunks, $chunk if $chunk;
> > -> $chunk = '';
> >
> > After reading the push function description from "learning Perl" I
> > am failing to understand exactly what is happening here.
>
> It adds an element to the array @chunks with what's been stored in
> $chunk from previous iterations, and then it empties $chunk.
>
> The line
>
> push @chunks, $chunk if $chunk;
>
> can also be written
>
> if ($chunk) {
> push @chunks, $chunk;
> }
>
> My suggestion means that the whole log file ends up in memory in the
> array @chunks. I thought that made the code easier to understand, but
> it should be noted that if the log file is really big, it's not a good
> approach. In that case, you'd better do in the loop with respective
> 'generation' of $chunk whatever you want to do with it, and refrain
> from storing the whole file in an array.
>
> HTH
>
> --
> Gunnar Hjalmarsson
> Email: http://www.gunnar.cc/cgi-bin/contact.pl
>
Thanks for the explanation, And I already understood the implication of the
whole file being in memory. In this case, it is not a problem, the log is
generally ony 3-5Meg but never over 50Meg.
For those interested, I have included the full script below
Regards,
B
#!/usr/bin/perl
#
# NAME qmail-qreadto
# purpose - look thru the qmail-qread logs for particular messages
#
use strict;
use warnings;
if (@ARGV == "0" ) {
print "\n\tqmail-qreadto \{ email to search for\} \n";
print "\t\texample\: qmail-qreadto me\@example.net \n\n";
exit 0
}
my ($Log, @Logs);
my $file1 = "/var/log/qmail-qread";
my $file2 = "/var/log/qmail-qread1";
if (-e $file2 ) {
open (MyFILE, $file2);
} else {
open (MyFILE, $file1);
}
while (<MyFILE>) {
if (/^\d{1,2}/) {
push @Logs, $Log if $Log;
$Log = '';
}
$Log .= $_;
}
close MyFILE;
push @Logs, $Log;
print grep {/@ARGV/} @Logs;
exit 0;
------------------------------
Date: Fri, 10 Oct 2003 10:00:03 +0200
From: Gunnar Hjalmarsson <noreply@gunnar.cc>
Subject: Re: data manipulation
Message-Id: <bm5p1k$it1bv$1@ID-184292.news.uni-berlin.de>
Bob wrote:
> Thanks for the explanation, And I already understood the
> implication of the whole file being in memory. In this case, it is
> not a problem, the log is generally ony 3-5Meg but never over
> 50Meg.
I'm glad to be able to help, Bob. My apologies for being assumptive in
my first reply - you were obviously ready to put more effort in it
than I first thought. ;-)
> For those interested, I have included the full script below
Looks good to me.
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
------------------------------
Date: 9 Oct 2003 21:14:40 -0700
From: ifiaz@hotmail.com (ifiaz)
Subject: Efficient field splitting? unpack or substr
Message-Id: <93c1947c.0310092014.699ed304@posting.google.com>
I have a data that looks like this in a single line.
"01 17060757 EG 6880232 N 0131020321 17 060712 l 8828 TR6322
00030070 01 20030317060807749544 060645 244 PA1"
for about 280,000 lines.
The fields are fixed-widths. You can't extract it using delimiters as
some of the
fields may be blank.
I originally wrote an awkscript and used substr to extract the fields
from $0
and it took 25.26 seconds to calculate the summary.
Field Splitting in awk, for your info
F1 =substr($0, 1, 2)
TiltTime =substr($0, 4, 8)
....
....
Using awk to perl converter, the same thing in perl took only 11.03
seconds.
(awk to perl used substr as well)
Field Splitting in awk to perl, for your info
$F1 = substr($_, 1, 2);
$TiltTime = substr($_, 4, 8);
....
....
Now, I wrote a perl script, but only replaced the field splitting part
with
unpack. Now, the script takes 21.5 seconds.
Field Splitting in perl using unpack, for your info
($F1, $TiltTime, ...) =
unpack("a2xa8xa2xa3a5xa1xa10xa2xa6xa1xa4xa8xa6xa8xa2xa20xa6xa3xa3",
$_);
....
....
Why is unpack not efficient? Am I doing anything wrong?
Should I stick to substr to do such field splitting in the future?
Can I write it any other way to make it more efficient.
- Fiaz Idris
------------------------------
Date: Fri, 10 Oct 2003 04:58:30 GMT
From: James Willmore <jwillmore@remove.adelphia.net>
Subject: Re: Efficient field splitting? unpack or substr
Message-Id: <20031010005830.0f990be4.jwillmore@remove.adelphia.net>
On 9 Oct 2003 21:14:40 -0700
ifiaz@hotmail.com (ifiaz) wrote:
<snip>
> Why is unpack not efficient? Am I doing anything wrong?
> Should I stick to substr to do such field splitting in the future?
> Can I write it any other way to make it more efficient.
It does not appear that you're doing anything wrong. 'unpack' will
look at the whole line and, well, unpack it :-) 'substr', you're
telling the script _exactly_ where to look, so it's not looking at the
whole line.
The question you need to ask yourself is this - do I _need_ to examine
the whole line, or just extract the required data from the line? Use
substr for just pieces of the line, unpack for the whole line.
HTH
--
Jim
Copyright notice: all code written by the author in this post is
released under the GPL. http://www.gnu.org/licenses/gpl.txt
for more information.
a fortune quote ...
Never hit a man with glasses. Hit him with a baseball bat.
------------------------------
Date: Fri, 10 Oct 2003 07:46:51 GMT
From: Steve Grazzini <grazz@pobox.com>
Subject: Re: Efficient field splitting? unpack or substr
Message-Id: <Ltthb.38073$541.25910@nwrdny02.gnilink.net>
ifiaz <ifiaz@hotmail.com> wrote:
> Why is unpack not efficient?
Remember that unpack() has to parse the template every time
through the loop...
> Should I stick to substr to do such field splitting in the
> future?
That's up to you. I'll just mention that the unpack() version
can be much, much easier to read.
@fields = qw(one two three ...);
$template = qq(a4 a12 a3 ...);
while (<>) {
@data{ @fields } = unpack $template, $_;
}
--
Steve
------------------------------
Date: 9 Oct 2003 23:36:47 -0700
From: Haresh_mn@hotmail.com (Haresh)
Subject: Error returned while invoking a ".exe" from a perl script
Message-Id: <d5fbff96.0310092236.301009a9@posting.google.com>
hi,
I am trying to invoke an exe from a perl script using the "system"
command. The error returned is 128 [32768/256]. If this error code
corresponds to the win32 system error codes then the error returned is
ERROR_WAIT_NO_CHILDREN, which according to microsoft is beacuse of
either security problems or low heap size. In my case the 2nd cause is
not true and so the problem is mostly beacuse of some security issue.
The Web Server on which i am trying to execute this command has HTTPS
installed.
Does anyone have any leads regarding this problem.
Please let me know.
Thanks
Haresh
------------------------------
Date: Fri, 10 Oct 2003 06:48:28 +0000 (UTC)
From: "Bernard El-Hagin" <bernard.el-haginDODGE_THIS@lido-tech.net>
Subject: Re: Error returned while invoking a ".exe" from a perl script
Message-Id: <Xns9410596E42F80elhber1lidotechnet@62.89.127.66>
Haresh_mn@hotmail.com (Haresh) wrote in news:d5fbff96.0310092236.301009a9
@posting.google.com:
> hi,
>
> I am trying to invoke an exe from a perl script using the "system"
> command. The error returned is 128 [32768/256]. If this error code
> corresponds to the win32 system error codes then the error returned is
> ERROR_WAIT_NO_CHILDREN, which according to microsoft is beacuse of
> either security problems or low heap size. In my case the 2nd cause is
> not true and so the problem is mostly beacuse of some security issue.
> The Web Server on which i am trying to execute this command has HTTPS
> installed.
> Does anyone have any leads regarding this problem.
> Please let me know.
What is your Perl question?
Cheers,
Bernard
------------------------------
Date: Fri, 10 Oct 2003 08:31:01 +0200
From: Kurt Kronschnabl <kurt.kronschnabl-nospam@ica-intercom-akademie.de>
Subject: Re: How To activate command line history in debugger?
Message-Id: <bm5l68$p6l$02$1@news.t-online.com>
Peter Scott wrote:
> I told you how to install it.
Sorry it seems that I misunderstood something.
You wrote "You could get round that error" ... "but that is not the
point." Therefore I didn't try the comamnd.
But now I tried it. But we have an Socks Proxy here running, Therefore
CPAN: LWP::UserAgent loaded ok
Fetching with LWP:
ftp://ftp.perl.org/pub/CPAN/authors/01mailrc.txt.gz
does not work.
But I downloaded ReadKey.pm from the CPAN site and saved and changed the
owner:group to root the file in /usr/share/perl/5.8.0/Term which is part
on @INC.
Is there another way nessecary to make perl the new module known?
Regards,
Kurt
------------------------------
Date: Thu, 9 Oct 2003 21:55:57 -0700
From: "GAH" <gah205@nyu.edu>
Subject: Perl Hash Performance
Message-Id: <voceuv3s6p440a@corp.supernews.com>
I'm extending an app (half written in C, half in perl) that will be
processing real-time streaming data. There are no language restrictions.
Currently, the segment of the app which does most of the dirty work of
processing the data is written in C. I am considering writing my portion in
perl. However, the processing will require a hash lookup for each data
element received. So my question is: how does the performance of perl
hashes stack up to similar implementations in compiled languages like C?
Obviously a good C implementation will most likely be faster, but as long as
the performance is adequate I'm happy. Numbers would be helpful, but also
anyone who has done similar tasks and can provide some real-world examples
of how it worked for them I'd be greatly appreciative. Thanks.
-Greg
--
================================
Gregory Horvath
gah205@nyu.edu
================================
------------------------------
Date: 10 Oct 2003 09:48:40 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: Perl Hash Performance
Message-Id: <bm5v9o$kbs$1@mamenchi.zrz.TU-Berlin.DE>
GAH <gah205@nyu.edu> wrote in comp.lang.perl.misc:
> I'm extending an app (half written in C, half in perl) that will be
> processing real-time streaming data. There are no language restrictions.
> Currently, the segment of the app which does most of the dirty work of
> processing the data is written in C. I am considering writing my portion in
> perl. However, the processing will require a hash lookup for each data
> element received. So my question is: how does the performance of perl
> hashes stack up to similar implementations in compiled languages like C?
Perl's hash implementation is probably hard to beat as far as general
hash implementations go. If you have special properties of keys or
values to exploit, a specialized implementation could be faster.
> Obviously a good C implementation will most likely be faster, but as long as
> the performance is adequate I'm happy. Numbers would be helpful, but also
> anyone who has done similar tasks and can provide some real-world examples
> of how it worked for them I'd be greatly appreciative. Thanks.
The problem may well not be with the performance of the hash but with
the call overhead involved in a Perl operation. If the call to the
hash is from C you may gain something by implementing your own. If
each call to the hash is from Perl anyway, you won't gain much.
Anno
------------------------------
Date: Fri, 10 Oct 2003 02:22:19 -0500
From: tadmc@augustmail.com
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.4 $)
Message-Id: <in6dnQwOMKW2wxuiXTWJig@august.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.4 $)
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.
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
"Jeopardy" (because the answer comes before the question), or
"TOFU".
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: Fri, 10 Oct 2003 09:58:13 +0100
From: Peter Hickman <peter@semantico.com>
Subject: tree drawing toolkit
Message-Id: <3f8674a7$0$11448$afc38c87@news.easynet.co.uk>
I have lots of data in the form of
root is note A
node A links to node B
node B links to node C
node B links to node D
node D links to node E
This is a straight forward tree, no loops and (hopefully) no cross links.
Is there any module that could take this data and produce an image from it?
The trouble is that graph seems to translate to pie chart etc in CPAN.
------------------------------
Date: 10 Oct 2003 01:34:24 -0700
From: nobull@mail.com
Subject: Re: trying to understand a hash - understanding has occured
Message-Id: <4dafc536.0310100034.69be4266@posting.google.com>
tadmc@augustmail.com (Tad McClellan) wrote:
> I myself <tadmc@augustmail.com> wrote:
>
> > print 'hi' => ' ' => 'there';
> >
> > print hi => ' ' => there;
> >
> > all make the same output.
>
> Errr, _maybe_ that last one makes the same output. It depends
> on whether a there() function has been defined at this point
> in the code.
s/defined/declared/
:-)
------------------------------
Date: Sat, 19 Jul 2003 01:59:56 GMT
From: Bob Walton <bwalton@rochester.rr.com>
Subject: Re:
Message-Id: <3F18A600.3040306@rochester.rr.com>
Ron wrote:
> Tried this code get a server 500 error.
>
> Anyone know what's wrong with it?
>
> if $DayName eq "Select a Day" or $RouteName eq "Select A Route") {
(---^
> dienice("Please use the back button on your browser to fill out the Day
> & Route fields.");
> }
...
> Ron
...
--
Bob Walton
------------------------------
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:
The Perl-Users Digest is a retransmission of the USENET newsgroup
comp.lang.perl.misc. For subscription or unsubscription requests, send
the single line:
subscribe perl-users
or:
unsubscribe perl-users
to almanac@ruby.oce.orst.edu.
To submit articles to comp.lang.perl.announce, send your article to
clpa@perl.com.
To request back copies (available for a week or so), send your request
to almanac@ruby.oce.orst.edu with the command "send perl-users x.y",
where x is the volume number and y is the issue number.
For other requests pertaining to the digest, send mail to
perl-users-request@ruby.oce.orst.edu. Do not waste your time or mine
sending perl questions to the -request address, I don't have time to
answer them even if I did know the answer.
------------------------------
End of Perl-Users Digest V10 Issue 5642
***************************************
