[23187] in Perl-Users-Digest
Perl-Users Digest, Issue: 5408 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri Aug 22 06:06:20 2003
Date: Fri, 22 Aug 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, 22 Aug 2003 Volume: 10 Number: 5408
Today's topics:
Re: \@rray, error? maybe not. <bigj@kamelfreund.de>
Re: comparison with functions ord and length (Bohne)
Re: How can I put my email address on my website withou (UK\)
Re: imagemagick composite problem <lam-no-spamm-thanks@nospam.org>
Re: IN SEARCH OF ELEGANT CODE: Setting a hash value to <dave.nospam@ntlworld.com>
Re: IN SEARCH OF ELEGANT CODE: Setting a hash value to <tassilo.parseval@rwth-aachen.de>
Killing frozen system("something.exe") call - how? (Alexandre Bougakov)
operator in a variable? <michaelr@encraft.com>
Re: operator in a variable? (Sam Holden)
Re: operator in a variable? <bigj@kamelfreund.de>
perl data transfer (SRam)
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@augustmail.com
Re: Quick removal of the begging of a file? <tzz@lifelogs.com>
Re: Regular Expression - BackReferences Question <bigj@kamelfreund.de>
Re: <bwalton@rochester.rr.com>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Fri, 22 Aug 2003 11:37:03 +0200
From: "Janek Schleicher" <bigj@kamelfreund.de>
Subject: Re: \@rray, error? maybe not.
Message-Id: <pan.2003.08.22.09.37.01.784375@kamelfreund.de>
Ben Dover - Mental Patient 0057 wrote at Thu, 21 Aug 2003 16:05:31 -0400:
> I'm looking at another persons code and I saw what I thought was an
> error, but it seems to be in more than one place.
>
> the following line for example:
> ($web{open},$web{dates},$web{stat}) = classStat($loc,\@classes);
Allthough the \ is correct (as Tad already has explained),
there is IMHO still something that could be improved.
I personally would write the assignment not as an
assignment to 3 different hash elements, but to a hash slice of 3 elements
of the same hash:
(@web{qw/open dates stat/}) = classStat($loc,\@classes);
That has the advantage of being shorter and removing unnecessary doubled
code what could get a problem for maintainance in future.
It has the more important advantage that the main idea is expressed more
directly:
Set the values for some keys of the %web hash.
Greetings,
Janek
------------------------------
Date: 22 Aug 2003 01:32:11 -0700
From: simjesse@aol.com (Bohne)
Subject: Re: comparison with functions ord and length
Message-Id: <bfedec4.0308220032.38f486fe@posting.google.com>
Thank you!
I knew, somebody out there was smarter than me!
------------------------------
Date: Fri, 22 Aug 2003 09:26:47 +0100
From: "JJ \(UK\)" <gee@i.cant.think.why.you'd.want.my.email.address.com>
Subject: Re: How can I put my email address on my website without attracting Spam?
Message-Id: <Ask1b.142$qk1.104334@newsfep2-gui.server.ntli.net>
"Jürgen Exner" <jurgenex@hotmail.com> wrote in message
news:dJ31b.20437$_P1.15350@nwrddc01.gnilink.net...
> Jukka K. Korpela wrote:
> > "Jürgen Exner" <jurgenex@hotmail.com> wrote:
> >
> >> Just create a bitmap/gif/jpeg that contains the information.
> >> There are not many spammers out there who would go through the
> >> trouble of running an OCR program on every graphic or image, hoping
> >> to decipher an email address.
> >
> > And many blind people, too, and people who will just regard such a
> > nuisance method as a bogosity indicator and refrain from doing
> > business with the author.
> >
> >> However, what does that have to do with Perl?
> >
> > Or HTML, for that matter? The whole thread is off-topic in both
> > groups, but so are most other crossposted threads on Usenet. This
> > does not imply that you should feel compelled to give very bad advice.
>
> You are raising very good points, indeed.
> I guess that is the quality of advice you get when asking your barber
about
> how to fix your car.
>
> jue
>
Not necessarily good points. Is it not possible that the original poster
thought that Perl could be used to code something that achieved the results
he required? That might have been an ignorant position but perhaps he'd
heard that Perl is good for web page coding. The same for HTML (not exactly
a huge leap of faith seeing as Web Pages are coded in HTML!)
--
JJ (UK)
------------------------------
Date: Fri, 22 Aug 2003 11:36:17 +0200
From: Lam <lam-no-spamm-thanks@nospam.org>
Subject: Re: imagemagick composite problem
Message-Id: <tcd6ey9gq6.fsf@lam.dev33.cvf>
Martien Verbruggen <mgjv@tradingpost.com.au> writes:
> On Thu, 21 Aug 2003 19:33:38 +0200,
> Lam <lam-no-spamm-thanks@nospam.org> wrote:
>> hi
>> i have a problem to compose 2 images :
>> the code :
>
> That is, however, not all of your code. It is nicer, and more polite,
> to post a full program that people can run. There's quite a bit of
> editing to do to your code to fill in the blanks, before it can be run.
>
>> my $effect_image = new Image::Magick;
>> my $status = $effect_image->Read($image_before);
>> die "Couldn't open file! $status" if $status;
>
> You check for problems. Good idea.
>
>> my $background = new Image::Magick;
>> $background->Set(size => $x . "x" . $y);
>> $background->ReadImage('xc:grayscale');
>
> You don't check for problems here, however. Why not? And why do you
> use ReadImage() here, but Read() earlier? They're the same thing.
>
> $status = $background->Read('xc:grayscale');
> die $status if $status;
>
> You'll note that this is in error. Grayscale is not a colours; it's a
> colour space. What did you want? Gray?
>
> $status = $background->Read('xc:gray');
> die $status if $status;
>
>> Exception 410: Reference is not my type (Image::Magick) at ...
>>
>> any idea ?
>
> You need to check for errors earlier and more often.
ok
thanks
i modify my script
but i have another problem :
i must create a result image Y (geometry 230x150)
in this image, a can insert an image X, with geometry (x,y)
if X is smaller than the result image i would like to compose the rest
(Y - X) with background black
i see the function Montage, but i can't make what i want :(
does anybody have any idea ?
> Also see http://www.imagemagick.org/www/perl.html
yes i know
> Martien
--
(concatenate 'string "lam" (reverse "gro.ylimafxut@"))
Hiroshima 45, Tchernobyl 86, Windows 95
------------------------------
Date: Fri, 22 Aug 2003 08:04:58 +0100 (BST)
From: "Dave Saville" <dave.nospam@ntlworld.com>
Subject: Re: IN SEARCH OF ELEGANT CODE: Setting a hash value to a chomp'ed thing
Message-Id: <qnirfnivyyragyjbeyqpbz.hk0s8a8.pminews@text.news.ntlworld.com>
On 21 Aug 2003 12:38:36 +0100, Brian McCauley wrote:
>"John W. Krahn" <krahnj@acm.org> writes:
>
>> Well this will work, if that's what you want.
>>
>> %hash = ( key => grep [ chomp ], `which ps` );
>
>Wow, that's a neat trick.
Undoubtably - but could someone explain it in english please?
Regards
Dave Saville
NB switch saville for nospam in address
------------------------------
Date: 22 Aug 2003 07:41:59 GMT
From: "Tassilo v. Parseval" <tassilo.parseval@rwth-aachen.de>
Subject: Re: IN SEARCH OF ELEGANT CODE: Setting a hash value to a chomp'ed thing
Message-Id: <bi4hg7$l0n$1@nets3.rz.RWTH-Aachen.DE>
Also sprach Dave Saville:
> On 21 Aug 2003 12:38:36 +0100, Brian McCauley wrote:
>
>>"John W. Krahn" <krahnj@acm.org> writes:
>>
>>> Well this will work, if that's what you want.
>>>
>>> %hash = ( key => grep [ chomp ], `which ps` );
>>
>>Wow, that's a neat trick.
>
> Undoubtably - but could someone explain it in english please?
Normally you'd write it as
%hash = ( key => grep chomp, `which ps` );
grep() runs through the list (in this case `which ps` that happens to
only have one element) and applies the code given as first argument
(chomp). If this code snippet returns a true value for a particular list
element, this item is allowed to pass through. It's a filter
essentially.
Now, the return value of chomp() is the number of characters removed
from the end of the string. So it returns true for any string it was
able to shorten. Additionally, any changes done to $_ in the first
argument to grep will show up in the returned list. So it filters and
modifies its arguments in one go.
John used '[ chomp ]' instead of 'chomp'. '[ anything() ]' will always
have a true value when evaluated in boolean context. That way, it is
ensured that every element of the list is passed on regardless of
whether anything was chomped off the end or not. Consider the difference
between %hash1 und %hash2 in this example:
use Data::Dumper;
@b = @a = "test";
%hash1 = ( key => grep chomp, @a );
%hash2 = ( key => grep [ chomp ], @b );
print Dumper \%hash1;
print Dumper \%hash2;
__END__
$VAR1 = {
'key' => undef
};
$VAR1 = {
'key' => 'test'
};
Instead of '[ chomp ]' you could also write 'chomp || 1'. This makes
the forcing to a true value a little clearer.
Hmmh, amazing how much words I sometimes need to explain a single Perl
statement...
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: 22 Aug 2003 00:15:54 -0700
From: sanja@bougakov.com (Alexandre Bougakov)
Subject: Killing frozen system("something.exe") call - how?
Message-Id: <40082acc.0308212315.1a377da0@posting.google.com>
Hello,
I am using ActivePerl under Windows. I wrote a small script that
indexes a lot of *.pdf and *.doc files in a given directory using
external parsers.
It finds a file, and calls
system ("${doc2text_path}doc2text.exe -d cp1251 ${filename} >
${temp}output.txt");
the problem is that doc2text.exe "freezes" on some documents. It
outputs the text, but suddently stops, put Perl keeps waiting for it
to finish. I have to kill the script manually, delete the file that
caused the converter to stop and restart it all again.
The question is: can I make Perl to stop waiting for a called external
program to finish after one minute, for example, and than to kill the
frosen app., say "oops.." and to continue with the next commands?
Thanks in advance,
Sanja
------------------------------
Date: Fri, 22 Aug 2003 01:54:20 -0700
From: "Michael Roper" <michaelr@encraft.com>
Subject: operator in a variable?
Message-Id: <bi4lnu$5107a$1@ID-160215.news.uni-berlin.de>
Is it possible to store pieces of an expression in a variable that will get
expanded before the larger expression is evaluated? For example, could I
write something like: $result = $a $op $b; that would be evaluated as
$result = $a + $b;? Thanks.
Michael Roper
------------------------------
Date: 22 Aug 2003 09:22:47 GMT
From: sholden@flexal.cs.usyd.edu.au (Sam Holden)
Subject: Re: operator in a variable?
Message-Id: <slrnbkbo77.hun.sholden@flexal.cs.usyd.edu.au>
On Fri, 22 Aug 2003 01:54:20 -0700, Michael Roper <michaelr@encraft.com> wrote:
> Is it possible to store pieces of an expression in a variable that will get
> expanded before the larger expression is evaluated? For example, could I
> write something like: $result = $a $op $b; that would be evaluated as
> $result = $a + $b;? Thanks.
Yes, you can do it using eval, see "perldoc -f eval" for details.
However, that leads to security issues, and hard to find bugs. A far
better approach is to use a hash containing coderefs for each operator.
Something like:
my %ops = ( '+' => sub {return $_[0] + $_[1]},
'-' => sub {return $_[0] - $_[1]},
);
my $x = 123;
my $y = 456;
for my $op ('+', '-') {
my $result = $ops{$op}($x, $y);
print "$x $op $y = $result\n";
}
See "perldoc perlref" for details on code references.
--
Sam Holden
------------------------------
Date: Fri, 22 Aug 2003 11:30:47 +0200
From: "Janek Schleicher" <bigj@kamelfreund.de>
Subject: Re: operator in a variable?
Message-Id: <pan.2003.08.22.09.30.45.759549@kamelfreund.de>
Michael Roper wrote at Fri, 22 Aug 2003 01:54:20 -0700:
> Is it possible to store pieces of an expression in a variable that will get
> expanded before the larger expression is evaluated? For example, could I
> write something like: $result = $a $op $b; that would be evaluated as
> $result = $a + $b;? Thanks.
perldoc -f eval
E.g.
my $x = 4;
my $op = '+';
my $y = 5;
my $result = eval "$x $op $y";
print $result;
$a and $b are global variables, thus I switched to $x and $y.
May I ask what the problem is you need to evaluate operators for.
Allthough the above is an accurate way to solve the problem, it is only
rarely needed as there are often more secure, more failsafe and more
beautiful ways to solve the original problem.
eval STRING is one of the things that you usually won't use unless you
really want to use it :-)
Greetings,
Janek
------------------------------
Date: 22 Aug 2003 00:31:20 -0700
From: aksivaram2k2@yahoo.com (SRam)
Subject: perl data transfer
Message-Id: <20ffa179.0308212331.670576ff@posting.google.com>
I have implemented client/ Server using perl. I wish to know methods
for transfering large data between those client/ servers. I need to
transfer large image files between client & server. Can I use ftp or
any better methods are there
------------------------------
Date: Fri, 22 Aug 2003 02:22:48 -0500
From: tadmc@augustmail.com
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.4 $)
Message-Id: <a5KcnQ_xmKhVWdiiXTWJiQ@august.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($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, 22 Aug 2003 05:58:15 -0400
From: Ted Zlatanov <tzz@lifelogs.com>
Subject: Re: Quick removal of the begging of a file?
Message-Id: <4nr83ej9oo.fsf@lockgroove.bwh.harvard.edu>
On 22 Aug 2003, mgjv@tradingpost.com.au wrote:
> On Thu, 21 Aug 2003 14:05:07 -0400,
> Ted Zlatanov <tzz@lifelogs.com> wrote:
>> On Tue, 19 Aug 2003, ben.goldberg@hotpop.com wrote:
>>
>>>> > scalar(<FH>); # skip to the end of the line.
>>>
>>> I got the idea of skipping to the end of the line this way from
>>> look.pl.
>>
>> Doesn't this cause the whole file to be put into memory
>> temporarily?
>
> No. Just one line.
I don't know how I read "file" for "line" several times, apparently I
forgot to engage the higher brain functions before posting. Sorry!
Ted
------------------------------
Date: Fri, 22 Aug 2003 11:43:18 +0200
From: "Janek Schleicher" <bigj@kamelfreund.de>
Subject: Re: Regular Expression - BackReferences Question
Message-Id: <pan.2003.08.22.09.43.16.975096@kamelfreund.de>
Jay Tilton wrote at Thu, 21 Aug 2003 09:58:35 +0000:
> Almost there. You just need to make perl treat the replacement
> portion as code, so "$1+1" will actuall perform some math.
> The /e modifier gets it done.
>
> $line =~ s#(\d+)\.gif# $1+1 . ".gif" #e;
Or perhaps a bit more shorter and easier to maintain as
$line =~ s/(\d+)(?=\.gif)/$1+1/e;
Greetings,
Janek
------------------------------
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 5408
***************************************
