Hi,
$ perl -le 'open HD,"/etc/passwd" or die $!; ; print $!'
Bad file descriptor
what does this error mean? why it happens?
Thanks.
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于 2011-11-5 11:16, Anneli Cuss 写道:
$! is not guaranteed to be cleared if there was no error. This means you
probably don't have a "Bad file descriptor" error, it's just the last value
of $! (or 'errno').
That's confused.
Since there is not such an error, I was thinking $! or $@ shouldn't
inclu
于 2011-11-5 16:57, Uri Guttman 写道:
it isn't confusing. when a system call error occurs, you get an undef
return value which says that. then you check $! to see what was the
error. clearing $! on all good calls is a waste of cpu since most calls
succeed vs the number that fail. the same is true fo
于 2011-11-5 21:03, Shawn H Corey 写道:
You're assuming that perl clears $! at the start of your script. Never
assume a variable has a valid value unless you set it yourself. In other
words, always initialize your variables.
It did clear it, see this:
$ perl -le 'print $!;open HD,"/etc/passwd" o
于 2011-11-5 21:03, Shawn H Corey 写道:
You're assuming that perl clears $! at the start of your script. Never
assume a variable has a valid value unless you set it yourself. In other
words, always initialize your variables.
It did clear it, see this:
$ perl -le 'print $!;open HD,"/etc/passwd" o
于 2011-11-5 21:59, Shawn H Corey 写道:
The open statement:
perl -le 'print $!;open HD,"/etc/passwd" or die;print $!;;print $!'
So why? Thanks.
Ken.
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于 2011-11-5 22:20, Dr.Ruud 写道:
Who cares? You should only use $! *immediately* after an error.
Faint, why no one care? I do care it.
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ok if I said something rude I just say sorry now.
I was just uncomfortable for that unwanted $!.
于 2011-11-5 22:39, Dr.Ruud 写道:
On 2011-11-05 15:28, Ken Peng wrote:
于 2011-11-5 22:20, Dr.Ruud 写道:
Who cares? You should only use $! *immediately* after an error.
Faint, why no one care? I
于 2011-11-5 22:15, Shawn H Corey 写道:
It's something the OS does. Ever OS sets a different value.
$ perl -le 'print $!;open HD,"/etc/passwd" or die;print $!;;print $!'
Inappropriate ioctl for device
Inappropriate ioctl for device
$
Thanks for your explanation.
Maybe I should look into some o
于 2011-11-6 20:52, Shawn H Corey 写道:
It's a little off:
... you can build a fire and keep a man warm for a night
or put him on fire and keep him warm for the rest of his life!
授人以鱼不如授人以渔。
That's a well known Chinese proverb.
Theres is another related one:
临渊羡鱼，不如退而织网。
Don't know how to tra
于 2011-11-7 9:47, elodie 写道:
I would appreciate if someone could explain what the following command
does:
$sth->execute;
This run your SQL query.
It is an object method.
I would also like to know what the following command does:
$sth->errstr;
This is an instance variable of object, it incl
Hello,
Which module could show the order of loading modules?
For example,
use Foo;
use Bar;
BEGIN {
require A;
}
I want to know in what order Perl loads these modules.
Thanks.
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2011/12/15 Brian Fraser :
>
> The second way is using an @INC hook, which is explained in perldoc -f
> require. Here's a pretty simple form:
>
> BEGIN { unshift @INC, sub { say "@_[0..$#_]"; return } }
>
> But the real question here is, why do you need to know this?
>
Thanks Brian, your info is m
2011/12/15 shawn wilson :
>
> hence why i recommended strace so that you could see where perl looks
> for modules and in what order.
>
> that said, if someone has a way inside perl to do the same thing, it
> might be cool to know.
Yup I did the strace as you suggested and got some useful stuff.
T
> Hm, that's not quite right. It updates %INC as soon as it can open a
filehandle and start reading, but I don't think it ever updates @INC unless
you ask it to (e.g. by 'use lib' or -I on the command line, or mucking
with it manually).
>
sorry my typo. it is %inc not @inc. if perl updates %inc a
2011/12/15 Shlomi Fish :
>
> See:
>
> http://search.cpan.org/dist/Devel-TraceUse/
>
Great module, the result it prints is good.
Thanks Shlomi.
Ken.
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2011/12/16 Shlomi Fish :
> Regarding Perl 6 - you are right that it is taking a long time, and that some
> people feel its implementations are not usable for them yet. But it doesn't
> mean you can't use Perl 5 now, or that Perl 6 will never be ready, or that it
> didn't have a positive influence
How can Perl recognize user's input languages? for example, if the
message is in Chinese, the character encode will be GB2312. if it's in
latin, the encode will be iso-8859-1, etc.
Thanks.
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Hi
Is there a suggested framework for running daemon program? like
Net::Server for servers framework.I searched on cpan but got nothing
suitable.
Thanks.
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于 2013-3-15 10:19, Jim Gibson 写道:
Is there a suggested framework for running daemon program? like Net::Server for
servers framework.I searched on cpan but got nothing suitable.
>
See 'perldoc -q daemon', which mentions Proc::Daemon (I have not used it).
Thank you. I also currently happen to c
于 2013-3-15 10:19, Jim Gibson 写道:
On Mar 14, 2013, at 7:18 PM, Ken Peng wrote:
Hi
Is there a suggested framework for running daemon program? like Net::Server for
servers framework.I searched on cpan but got nothing suitable.
See 'perldoc -q daemon', which mentions Proc::Daem
On 2013-8-14 13:38, Frank Vino wrote:
Here is my requirement could you please help on this.
I have Domain Controller for 100 users, and i have client PC (windows
7), i would like to login with multiple users for every 5 minutes in a
same client PC.
Do you mean you need to login into the re
Does perl have a way to raise a error in module/class then from caller
use Try::Tiny etc to catch them? Thanks.
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On 2013-9-26 14:22, Shlomi Fish wrote:
I'm not using Try::Tiny (though many people recommend it), but I use
https://metacpan.org/release/Exception-Class and it works fine. It's not clear
what exactly you're trying to do.
what I asked is how to raise an error from a module/class correctly?
usi
Cloud is cool in these days.
Is there a cloud project written by Perl? like python for openstack, ruby for
cloudfoundry etc.
Thanks for your answers.
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I am checking this one:
http://www.activestate.com/blog/2011/05/stackato-platform-python-and-perl-cloud
http://www.activestate.com/stackato
Regards.
17.12.2013, 13:43, "Ken Peng" :
> Cloud is cool in these days.
> Is there a cloud project written by Perl? like python for ope
Hi,
perldoc perlref has a good description for your questions.
http://perldoc.perl.org/perlref.html
On Wed, May 14, 2014 at 1:31 PM, Mike Dunaway wrote:
> What's a good use of references? When is it ideal to use them? Why would
> you want to use them?
>
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Package it using the tool like module-starter
it will make you install the package as the standard process --
./configure && make && make install
http://search.cpan.org/~xsawyerx/Module-Starter-1.62/lib/Module/Starter.pm
Regards.
On Sat, May 17, 2014 at 3:17 AM, Mike Dunaway wrote:
> So I'v
Greetings Shlomi,
I am happy to see you have wrote a lot of articles for perl beginners.
Thanks.
On Sat, May 17, 2014 at 6:03 PM, Shlomi Fish wrote:
> Hi Mike,
>
> On Fri, 16 May 2014 14:17:30 -0500
> Mike Dunaway wrote:
>
> > So I've written a Perl utility and packed it with Fatpacker that I
Hello,
sub myfunc {
my @x=(1,2,3);
return \@x;
}
# or,
sub myfunc {
my @x=(1,2,3);
return [@x];
}
which one is the better way to return the list content? And if the
method is an instance method?
Thanks.
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It depends. If going with pop3 protocal,
http://search.cpan.org/~shay/libnet-1.27/Net/POP3.pm
If going with IMAP protocal, then try search,
http://search.cpan.org/search?query=imap&mode=all
Also there are the modules for special providers,
http://search.cpan.org/~dannyt/WWW-Gmail-1.0/lib/WWW/Gma
Since this is a shadow copy, I don't think the first array will be
deleted completely. Isn't it?
The second option creates the same array and populates it, but then
copies it to another anonymous array, deletes the first array, and
returns a reference to the copy.
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在 2014-09-13 15:54，Santosh Kumar 写道：
Any good pointers or links on learning perl . Also any good pointer on
OOPS concepts.
http://learn.perl.org/ # and,
http://learn.perl.org/books/
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Module-starter is cool. I always use that for my packages management.
First of all, you should not use h2xs, but rather Dist-Zilla or Module-Starter
(https://metacpan.org/release/Module-Starter ).
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Hello,
#1. Is there a framework to send/receive the large binary data flow? I
know thrift can do, but just don't like it.
#2. Is there a native perl library to implement the features which
'iostat' command has?
Thanks.
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https://webdevelopmenthistory.com/1994-perl-yahoo/
A nice reading for perl developers.
regards.
Or use GPT-3 who has a free online API.
https://openai.com/blog/openai-api/
regards
On Mon, Sep 13, 2021 at 11:42 PM Chankey Pathak
wrote:
> You can look into NLP https://metacpan.org/search?q=nlp
>
> On Mon, 13 Sept 2021 at 21:04, Julius Hamilton <
> juliushamilton...@gmail.com> wrote:
>
>> He
Hello
Try with this code:
use strict;
use warnings;
use Data::Dumper;
my @words = ("this","that");
# With this code
$words[5] = "bad idea";
print Dumper \@words;
And it outputs:
$VAR1 = [
'this',
'that',
undef,
undef,
undef,
'bad i
On 2023-05-24 09:21, Joe Sliva Jr. wrote:
I've been on this list for years but haven't actually used Perl lately.
That being said, I have an old Perl script that I would like to start
working with again but would prefer to work on it within a local dev
environment.
Can anyone please recommend a
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