nt something light and immutable.
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r while loop, only one client can connect at a time.
>
> What modification can prevent zombies yet allow multiple concurrent
> clients to attach?
You need the WNOHANG option on your wait() to make it nonblocking.
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ht
. This leads me to believe that
operand evaluation is either non-deterministic and compiler-dependent,
or it's simply broken.
Kudos for the curiosity. Did you have any other reason for wanting to
know how this worked in Perl?
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determined that they could remove this small speed bump
without any damage to the language.
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a bad
practice now. See
http://search.cpan.org/~petdance/Perl-Critic-Bangs-1.08/lib/Perl/Critic/
Policy/Bangs/ProhibitRefProtoOrProto.pm and near the end of http://
www.stonehenge.com/merlyn/UnixReview/col52.html.
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in the internals to make it safe: https://
groups.google.com/forum/?hl=enfromgroups=#!topic/comp.lang.perl.moderated/
_J9aO8pdAVc
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$MAX_PERMISSIBLE_RUN_TIME;
$SIG{ALRM} = sub { die Exceeded $MAX_PERMISSIBLE_RUN_TIME timeout };
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of HTML back that'll be tedious to validate. This is the
point at which you learn about separation of responsibilities and the
Model-View-Controller pattern if you want to improve how you do this in
the future.)
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::Env eq 'dev' ? '/path/to/dev' : '/path/to/prod' );
}
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} } )
{
print \t$inner_key: $hash{$outer_key}{$inner_key}\n;
}
}
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Strictly correct answer
that shows instructor didn't think about the question
Do let us know what grade that gets you :-)
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On Sat, 01 Sep 2012 04:05:31 +, Peter Scott wrote:
On 2012-08-29, at 12:46 PM, Ashwin Rao T ashwin...@gmail.com wrote:
1)Check if IP address is in the range 172.125.1.0 and 172.125.25.0
using only return functions regular expressions in Perl.
/\b172\.125\.(\d+)\.((?\d+))(??{(1=$1 $1
. Is there any means to look
inside? How to redirect the content of SENDMAIL in the debugger?
Am Donnerstag, 7. Juni 2012 06:19:43 UTC+2 schrieb Peter Scott:
On Mon, 04 Jun 2012 10:37:35 -0700, Marek wrote:
Could somebody please tell me, how can I see into a FILEHANDLE in
Perl debugger? I tried
On Mon, 04 Jun 2012 10:37:35 -0700, Marek wrote:
Could somebody please tell me, how can I see into a FILEHANDLE in Perl
debugger? I tried with x SENDMAIL but I get only empty array.
That filehandle is open for *output* in your program! What is it you
want to examine?
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On Sun, 20 May 2012 18:28:10 +0300, Shlomi Fish wrote:
Note that I think I saw a way to return the flattened array in Moose,
but I don't remember the specifics.
auto_deref = 1
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for in the
class itself, try superclasses. This is one case where the structured
nature of documentation in more rigid languages has an edge over Perl.
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third two second); $test{one} eq first and
$test{one} .= is the worst or $test{two} .= is the best; print for
values %test'
third
second is the best
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On Thu, 22 Mar 2012 20:06:35 -0400, Uri Guttman wrote:
no one uses braces for single scalar handles in general.
I do. Ever since Damian recommended it (Perl Best Practices, page 217).
One of those numerous times I didn't agree with him until I tried it,
then found he was right.
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with this kind of approach?
Tim Maher's Minimal Perl was designed for your kind of requirement:
http://www.amazon.com/Minimal-Perl-UNIX-Linux-People/dp/1932394508 .
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On Fri, 02 Mar 2012 21:31:50 +0100, Manfred Lotz wrote:
Another question I have: Where do I find what '-|' means? I mean the
minus before the pipe char.
perldoc -f open
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open:
sub run_cmd
{
my $cmd = shift;
open my $fh, '-|', $cmd 21 or die open: $!;
print while $fh;
close $fh;
return $? 8;
}
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. It sounds like some module is doing
ridiculous computations in its main code instead of being encapsulated in
subroutines. It should be tracked down and shot^Wrefactored. That's
likely to cause all kinds of problems, so working around it like you're
trying isn't really the answer.
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reading perldoc -f grep one more sentence:
In scalar context, returns the number of times the expression was true.
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with an experienced Perl
programmer that you find on somewhere like Perlmonks, and advertise that
you have XML/XSLT experience to bring to the party. On this list, your
options are more or less limited to asking how you can become a better
Perl programmer.
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after \{ in regex but how to span over multiple lines
and make this work. Need pointers.
May I suggest http://search.cpan.org/dist/Text-Balanced/ for this type of
endeavor.
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On Wed, 14 Dec 2011 20:42:10 -0300, Tessio Fechine wrote:
I have a cgi application that has a two way communication with a ldap
application via open2:
I need to keep communicating with the same ldap.pl process as other cgi
scripts are launched:
Sounds like you want a named pipe.
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that this is really how you would
test to see if you could read a file. I see people using access checks
all the time when they should simply be testing that they can open() the
file instead.
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is NOT ok
What is the program trying to accomplish? What does ok mean for a file
in the context of this exercise? The empirical derivation from the code
doesn't seem useful.
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multiple scripts. I could just add to this file as
needed if more scripts are created. What is the best way to do this?
Consider spawning code rather than programs and using
Parallel::ForkManager:
http://search.cpan.org/~dlux/Parallel-ForkManager-0.7.9/lib/Parallel/
ForkManager.pm
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On Jun 24 2002, 4:44 am, davidtg-perl-beginn...@justpickone.org (David T-
G) wrote:
...and then Peter Scott said...
% % Would you like tracing that goes off when you go into a function?
Suppose
% % if you gave a numeric argument to 't' it would trace up to that
depth
% % in subroutine calls
on the server.
those emails must be stored appended in a file on the local hard
drive.
I do this with Net::IMAP::Client.
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Well, your first problem is that the action target of the form is an HTML
page instead of a CGI program. What code have you got so far?
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that their installation tool then modified for
the local installation. So theoretically you could edit the binary to
replace the paths with anything the same length or shorter. As if you
weren't out on a long enough limb already.
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. Code duplication is so enervating.
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. if
there are multiple flavors for some package, `pkg_add` might prompt me
which one to install.
system() will still let *you* interface with pkg_add. Do you want your
program to be able to interface with pkg_add instead?
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point
of view anyway. There's even a program a2p that comes with perl (http://
perldoc.perl.org/a2p.html) for making transitioning automatic, if not
easier. Post what you're having trouble with here and we can help.
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in a if
loop, or should I use something else?
Am I missing something about why this approach won't work for you:
if ( ! /\A[[:upper:]][[:upper:]]/ ! /\A[[:digit:]]/ )
Seems easier to understand.
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?
Install one or both to a directory you can write to and put it in your
path.
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your application noticeably? Because programmer time is, in the
absence of proof of anything else, the most precious resource, and so
anything that takes longer than typing
use CGI;
is overkill. Especially if it requires downloading something not in core.
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filenames after completion to
STDOUT. how can i collect them into an array variable?
You would be better off calling it with backticks. Otherwise you have to
try fragile techniques such as tying filehandles.
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strict;
use warnings;
use Set::IntSpan; # http://search.cpan.org/perldoc?Set%3A%3AIntSpan
my ($diff, @sets) = map { Set::IntSpan-new( $_ ) }
qw(1-100 1-20 2-28 50-100 5-38);
$diff -= $_ for @sets;
print $diff\n;
$ ./differ
39-49
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? Without knowing those things any well-meaning
answers you could get here would probably lead you in the wrong
direction. Tell us what you find out.
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On Sat, 03 Sep 2011 13:39:47 +0200, werner wrote:
Am 03.09.11 13:31, schrieb Sean Murphy:
All.
How can I access my IMap messages from Google via Perll. I wish to
extract the message body only.
how about Mail::IMAPClient?
Or Net::IMAP::Client...
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abcdefabcdef[g]
[q]
FAIL: qqq
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For additional
On Thu, 11 Aug 2011 23:30:32 -0700, John W. Krahn wrote:
Peter Scott wrote:
On Thu, 11 Aug 2011 16:17:51 -0700, siegfried wrote:
Is there a way to do it with less typing? How can I do it without
creating a temporary variable @p? Thanks, siegfried
find /xyz -exec perl -e 'foreach(@ARGV){ my
,
siegfried
find /xyz -exec perl -e 'foreach(@ARGV){ my @p=split /; rename $_,
./$p[$#p].txt } '
Try this:
find /xyz -type f -print0 | perl -F/ -0lane 'rename $_,$F[-1].txt or
warn $!'
That should give you a good excuse to read perlrun :-)
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reams of code that initializes arrays
to literal lists, it's excruciating to read.
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-subclasses.
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:
$ perl -MPOSIX=strftime -MTime::HiRes=time -le '$t = time; $s=sprintf %
06.3f, $t-int($t/60)*60; print strftime %H:%M:$s %d:%m:%Y, localtime
$t'
20:38:44.551 03:06:2011
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of under 20 lines that we can run, tell
us what output you see from running it, and what output you think you
should see instead.
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of, So who put you in charge... oh yeah.
This doesn't have to be difficult.
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, although I'm not sure
exactly which ones right now. And cpan ExtUtils::MakeMaker won't help
since core comes before site in @INC.
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. Although if all you want
the text content for is further machine processing like checksums,
concordance, or indexing, then this is fine.
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in your
locale, e.g. 2am on a day that the clocks advanced.
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provides enough flexibility to do all kinds of things.
See http://search.cpan.org/perldoc?MooseX::Privacy. (That's Moose-X,
not Moo-Sex.) Class::Std can do this too.
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on this. I've been flirting
with Perl less than a year, it's so seductive I find myself debating
whether to go back to school.
Heh, camels can be like that :-)
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popular at one time although
templating makes a lot more sense.
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.
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http
but this one at least had a good run and I'll be
sorry if I end up leaving it too.
Andy Lester had a good article about this: http://perlbuzz.com/2010/11/
think-for-perls-sake.html. But judging from the responses it seems he
and I may be in a minority.
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just posing a question as a challenge for people to exercise
their brains, this would be better off in the Perl Quiz-of-the-Week list
(which hasn't seen any traffic in aeons).
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? Seems like you'd be better
off programming in assembler if that's your priority. Execution speed
hasn't been a primary concern since the '70s, if it was even one then.
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to always wrap the lexical filehandle in
curlies when using it as the indirect object, and I like the result a lot.
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then either
you are worried about the wrong thing or you have bigger problems. Worry
about speed only when (a) you've determined that your code is too slow,
and then (b) you've profiled it to find out where the bottleneck is (hint:
it's not likely to be in subroutine call overhead).
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. Any possible justification for a GOTO would be so arcane that it is
counterproductive to suggest it at all in a beginner's group.
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, just so it makes more
sense to me and to be on the safe side, I've renamed it
if_routine.
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a 'goto' targetting such labels. I wonder if this is a mistake
in the documentation, or it is simply saying that such a goto is
deprecated?
Mistake by the look of it. To the discoverer go the rights of perlbug :)
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is
so
bad, why did they add it to Perl?
Perl's goto is pretty old. Larry was feeling permissive and in a frame
of mind to make BASIC programmers happy. He regrets it. The perldoc for
goto says he has never found a reason to use it.
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indicated to me that
the person considering it has not understood the problem properly or
modeled its solution well. Goto simply is not part of the vocabulary of
clear coding.
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REFCNT = 2
FLAGS = (IOK,READONLY,pIOK)
IV = 10
SV = NV(0x8a4aef0) at 0x8a367d8
REFCNT = 2
FLAGS = (NOK,READONLY,pNOK)
NV = 100
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intention even better :-)
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what it said it would do or your script's fault
for not trapping an exception it needs to handle.
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On Tue, 22 Mar 2011 13:41:59 -0700, Randal L. Schwartz wrote:
Peter == Peter Scott pe...@psdt.com writes:
my $s = Streamer-new;
my $app = sub {
return sub {
$s-open_fh;
my $writer = shift-(
[ 200, [ Content-type = text/plain ], $s ] );
};
};
Peter As it stands, this doesn't make
expects it
to be an object).
You need to be very conversant with code references and functional
programming to be comfortable with this code.
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, not solve them for you. You might still get solutions - like
you did here - but things will go better when you ask for learning
instead.
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you posted or did someone else? Do you
understand it?
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it. And in the core:
POSIX, for instance.
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://search.cpan.org/~dmaki/Google-Chart-0.05014/lib/Google/Chart.pm
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Unwrapped:; $x = $x || $y; say Done; sub F::TIESCALAR{ bless [],
F }; sub F::AUTOLOAD{ say $F::AUTOLOAD } '
Orcish:
F::FETCH
Unwrapped:
F::FETCH
Done
F::DESTROY
F::DESTROY
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. You'll have a much easier
time using WWW::Mechanize and many more people will be in a position to
help you.
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of those
possibilities and more would have radically different answers and you
have not provided any information to differentiate between them.
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.
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suggestions also for training.
Web-based training with instructor feedback at the O'Reilly School of
Technology:
http://www.oreillyschool.com/courses/perl1/
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On Tue, 04 Jan 2011 01:09:56 -0500, George Worroll wrote:
On Windows, that line is just a comment. Neither the operating system
nor the interpreter does anything with it.
Not quite. Any options on the line (e.g., -T) will be activated.
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career path then we'd need to know a lot more
about what your priorities and background are.
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than retype
it, I googled and found it in a Perl Journal article saved at http://
www.foo.be/docs/tpj/issues/vol4_3/tpj0403-0008.html .
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thing.
True, it won't be easy, but if you can come up with a test for whatever
bug you are experiencing, it will be invaluable for saving time later.
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-ping
(localhost) or warn SSH down'
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alters the messages in the following ways:
Can you create a redirection rule instead?
http://office.microsoft.com/en-us/outlook-help/automatically-forward-
messages-to-another-e-mail-account-HA001150201.aspx
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what the feeding habits of emus
are because you used your car to drive to the zoo.
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On Wed, 20 Oct 2010 17:09:17 +0530, Jyoti wrote:
I need your help. Please tell me a good book for perl for system
administration.
Perl for System Administration
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not want to execute command on server
it should be examined via my script and then it should get executed .
Let me know if this is possible using perl or I have to use any other
scripting language like python.
Yes, the documentation for Net::SSH::Perl explains how.
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an interactive program that won't terminate
without user input. Neither will iostat 1 terminate; but iostat 1 10
works fine, just got to wait 10 seconds.
I don't see anything in your pstree output that looks truncated.
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the
module isn't built right, you have the wrong credentials, you aren't
connecting, or the remote end doesn't have the right environment,
something like that.
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.
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, not by modifying what perl sees.
http://www.stunnix.com/prod/po/overview.shtml :
Now, I haven't used it. But it does claim to be an exception to your
rule. The users manual has a section on what to do about symbolic name
construction.
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make, trying to understand and change a large body of
code that has the worst names possible may not be impossible, but still
is excruciating.
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me any resources
which could help me.
I have been developing in Perl for 20 years and doing enterprise
architecture for 10 years. But I have no idea what a Perl architect
is. Please explain in more detail.
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On Fri, 02 Jul 2010 23:00:48 +0530, Amit Saxena wrote:
On Fri, Jul 2, 2010 at 9:41 PM, Peter Scott pe...@psdt.com wrote:
On Fri, 02 Jul 2010 09:34:05 +, Amit Saxena wrote:
I have around 6+ years of IT experience as a software development
mailing in scripting technologies using perl
On Mon, 14 Jun 2010 11:23:34 -0700, kenTk wrote:
How can I conditionally use a module?
perldoc if
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