[23515] in Perl-Users-Digest
Perl-Users Digest, Issue: 5724 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Wed Oct 29 11:05:45 2003
Date: Wed, 29 Oct 2003 08:05:08 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Wed, 29 Oct 2003 Volume: 10 Number: 5724
Today's topics:
Re: [OT] DOS window. <usenet@morrow.me.uk>
Re: [OT] pcre in PHP <usenet@morrow.me.uk>
Re: Call Perl Scripts from Other Dir in Linux, Path Mes <usenet@morrow.me.uk>
Re: cksum module (Anno Siegel)
Re: cksum module <kalinaubears@iinet.net.au>
Re: cksum module <usenet@morrow.me.uk>
Re: cksum module (Anno Siegel)
Re: Conditional look-ahead? <bharnish@technologist.com>
DHCP client tool (Peter Lohmeier)
DOS window. <spikeywan@bigfoot.com.delete.this.bit>
Re: DOS window. <pasdespam_desmond@zeouane.org>
Re: Finding out if a string has a trailing slash <stanb@panix.com>
Re: help... this perl is different... null values are c <steven.smolinski@sympatico.ca>
Re: multiline regular expression, is it possible? <REMOVEsdnCAPS@comcast.net>
Re: multiline regular expression, is it possible? <zkent@adelphia.net>
Re: opendchub script problem (Anno Siegel)
Resetting //g (Roy Johnson)
Re: Resetting //g <usenet@morrow.me.uk>
Re: Rounding a float in Perl? <bart.lateur@pandora.be>
Re: Rounding a float in Perl? (Anno Siegel)
Re: Rounding a float in Perl? <jurgenex@hotmail.com>
Video::Capture example? <stanb@panix.com>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Wed, 29 Oct 2003 15:49:04 +0000 (UTC)
From: Ben Morrow <usenet@morrow.me.uk>
Subject: Re: [OT] DOS window.
Message-Id: <bnonhg$h25$1@wisteria.csv.warwick.ac.uk>
"Richard S Beckett" <spikeywan@bigfoot.com.delete.this.bit> wrote:
> For various reasons, I'm still running w98 at home, and have discovered that
> the w98 dos window is particularly crap, as I can't specify a buffer size.
>
> If I put cmd.exe from my w2k machine onto the w98 machine, will it run OK,
> and give me the dos window I'm used to, or is this a bad idea?
I would have thought it would fail, without having tried it. Win2k
'DOS' is in fact nothing of the sort, it is a somewhat better shell.
> Are there any better ways around this?
I would probably install MSYS from http://mingw.org/msys.shtml.
You realise this has nothing to do with Perl... :)
Ben
--
It will be seen... that the Erwhonians are a meek and long-suffering people,
easily led by the nose, and quick to offer up common sense at the shrine of
logic, when a philosopher arises among them who... convinc[es] them that their
...institutions are not based on... morality. [Samuel Butler] ben@morrow.me.uk
------------------------------
Date: Wed, 29 Oct 2003 15:32:05 +0000 (UTC)
From: Ben Morrow <usenet@morrow.me.uk>
Subject: Re: [OT] pcre in PHP
Message-Id: <bnomhl$gni$2@wisteria.csv.warwick.ac.uk>
"Zachary Kent" <zkent@adelphia.net> wrote:
>
> "Eric J. Roode" <REMOVEsdnCAPS@comcast.net> wrote in message
> news:Xns942347700787Esdn.comcast@216.196.97.136...
>
> > "Almost" probably isn't good enough. From a Perl point of view, there's
> > nothing wrong with your regular expression. I don't know PHP, so I don't
> > know if there's some difference in how the two languages do regular
> > expressions which is causing your problem. If I did, I'd probably hang
> out
> > in a PHP newsgroup. Assuming there are PHP newsgroups.
>
> The idea behind "preg..." in PHP is to utilize perl regex in PHP. However,
> I don't know if it is using perl to power the preg regex or just borrowing
> perl's syntax for consistency.
It uses libpcre, Perl-Compatible Regular Expressions.
An absolute life-saver when working with PHP :).
Ben
--
The cosmos, at best, is like a rubbish heap scattered at random.
- Heraclitus
ben@morrow.me.uk
------------------------------
Date: Wed, 29 Oct 2003 12:52:39 +0000 (UTC)
From: Ben Morrow <usenet@morrow.me.uk>
Subject: Re: Call Perl Scripts from Other Dir in Linux, Path Messed Up
Message-Id: <bnod6n$ckn$1@wisteria.csv.warwick.ac.uk>
Bart Lateur <bart.lateur@pandora.be> wrote:
> You could demand that people chdir to the path containing the files,
> before calling your script, or you could use the FindBin module to find
> out where the script itself is. I'll stay a bit sketchy on that
> approach, because FindBin is somewhat broken, it sometimes refuses to
> work in mysterious ways.
>
> The approach I'm advocating, is to simply figure out the path,
> either absolute or relative, out of $0, the name for the script,
> since that is *always* a valid path, at startup. At least, I can't
> think of any counter-examples.
You should check what you write before you post. For instance, have a
look at perldoc -m FindBin. What FindBin does is make a rather more
sophisticated attempt than you recommend at extracting the path of the
script out of $0: the fact that it sometimes refuses to work is
because this is not always possible. For instance, invoking a script
as 'perl script' will leave only 'script' in $0, with no path info at
all. See also KNOWN BUGS in perldoc FindBin: there is no way round
this problem.
Ben
--
Joy and Woe are woven fine,
A Clothing for the Soul divine William Blake
Under every grief and pine 'Auguries of Innocence'
Runs a joy with silken twine. ben@morrow.me.uk
------------------------------
Date: 29 Oct 2003 11:09:12 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: cksum module
Message-Id: <bno74o$1p7$2@mamenchi.zrz.TU-Berlin.DE>
zeke03 <zeke03_no_spam@caramail.com> wrote in comp.lang.perl.misc:
>
> Hello,
>
> I have a question concerning the String-CRC-Cksum-0.03 CPAN module.
>
> I have downloaded Cksum.pm and Makefile.PL and put it in c:\perl\lib\cksum (i
> work on Windows and i would work on unix and linux after)
> I have launched "perl Makefile.PL", then the file Makefile has been create in
> c:\perl\lib\cksum folder.
That is only the first step. You need to run "make", "make test", and
"make install" to install the module.
> My little perl program, in a folder, i want to do a cksum to each files in the
> folder (i am a beginner) doesn't work :
>
> use String::CRC::Cksum;
> use String::CRC::Cksum qw(cksum);
> use File::Spec;
>
> $reptra='c:\temp\data_integrity';
> chdir $reptra or die "Can't go in work folder Because: $! \n";
>
> ### Globalisation
> my @all_files = glob "*";
> print Dumper @all_files;
>
> ### Threat
>
> foreach $arg (@all_files)
> {
> $cksum=cksum($arg);
> print "CHECK SUM = $cksum \n\n";
> }
>
>
> => perl d:\ssh_integre.pl
> Can't locate String/CRC/Cksum.pm in @INC (@INC contains: C:/Perl/lib) at
> d:\ssh_integre.pl line 1.
That's no surprise, since you haven't installed the module.
Your @INC doesn't look right either. I don't know what it is supposed
to hold on a windows system, but there's usually more than just one
directory in it.
Anno
------------------------------
Date: Wed, 29 Oct 2003 22:37:23 +1100
From: Sisyphus <kalinaubears@iinet.net.au>
Subject: Re: cksum module
Message-Id: <3f9fa730$0$1722$5a62ac22@freenews.iinet.net.au>
zeke03 wrote:
> Hello,
>
> I have a question concerning the String-CRC-Cksum-0.03 CPAN module.
>
> I have downloaded Cksum.pm and Makefile.PL and put it in c:\perl\lib\cksum (i
> work on Windows and i would work on unix and linux after)
> I have launched "perl Makefile.PL", then the file Makefile has been create in
> c:\perl\lib\cksum folder.
>
Normally, you would extract String-CRC-Cksum-0.03.tar.gz to a directory
*outside* of the perl installation, cd to the 'String-CRC-Cksum-0.03'
folder within that directory, and run the following 4 commands:
perl Makefile.PL
make
make test
make install
You would replace 'make' in the above with whatever 'perl -V:make' reports.
This module is, however, pure-perl (no compilation necessary), so you
could simply place 'Cksum.pm' in any of the folders listed in @INC and
that would work.
Cheers,
Rob
--
To reply by email u have to take out the u in kalinaubears.
------------------------------
Date: Wed, 29 Oct 2003 12:21:41 +0000 (UTC)
From: Ben Morrow <usenet@morrow.me.uk>
Subject: Re: cksum module
Message-Id: <bnobcl$bq1$1@wisteria.csv.warwick.ac.uk>
anno4000@lublin.zrz.tu-berlin.de (Anno Siegel) wrote:
> zeke03 <zeke03_no_spam@caramail.com> wrote in comp.lang.perl.misc:
> > Can't locate String/CRC/Cksum.pm in @INC (@INC contains: C:/Perl/lib) at
>
> Your @INC doesn't look right either. I don't know what it is supposed
> to hold on a windows system, but there's usually more than just one
> directory in it.
IIRC C:/Perl/lib is all that @INC has in it for a default install of
ActiveState.
Ben
--
I've seen things you people wouldn't believe: attack ships on fire off the
shoulder of Orion; I've watched C-beams glitter in the darkness near the
Tannhauser Gate. All these moments will be lost, in time, like tears in rain.
Time to die. |-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-| ben@morrow.me.uk
------------------------------
Date: 29 Oct 2003 13:02:39 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: cksum module
Message-Id: <bnodpf$97h$1@mamenchi.zrz.TU-Berlin.DE>
Ben Morrow <usenet@morrow.me.uk> wrote in comp.lang.perl.misc:
> anno4000@lublin.zrz.tu-berlin.de (Anno Siegel) wrote:
> > zeke03 <zeke03_no_spam@caramail.com> wrote in comp.lang.perl.misc:
> > > Can't locate String/CRC/Cksum.pm in @INC (@INC contains: C:/Perl/lib) at
> >
> > Your @INC doesn't look right either. I don't know what it is supposed
> > to hold on a windows system, but there's usually more than just one
> > directory in it.
>
> IIRC C:/Perl/lib is all that @INC has in it for a default install of
> ActiveState.
I'd have expected something like site_perl even there, but what do I know :)
Anno
------------------------------
Date: Wed, 29 Oct 2003 15:57:43 GMT
From: Brian Harnish <bharnish@technologist.com>
Subject: Re: Conditional look-ahead?
Message-Id: <pan.2003.10.29.15.58.05.442989@technologist.com>
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On Wed, 29 Oct 2003 14:16:33 +0000, Steve Dunn wrote:
[snip...]
> p.s. I'm using the .NET regex classes
So, then, your asking in a perl group why?
Try a .NET group.
- Brian
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------------------------------
Date: 29 Oct 2003 05:32:35 -0800
From: pelohh@compuserve.de (Peter Lohmeier)
Subject: DHCP client tool
Message-Id: <ebbdbbfe.0310290532.47ee1e7e@posting.google.com>
Hi NG,
want to test DHCP responses ...
Do you mean, it is possible to send a DHCP request with Active State
Perl under W2k ??
And if so, would it be possible to set a special MAC Address also ??
Thanks
.pl
------------------------------
Date: Wed, 29 Oct 2003 15:23:09 -0000
From: "Richard S Beckett" <spikeywan@bigfoot.com.delete.this.bit>
Subject: DOS window.
Message-Id: <bnom3o$kqs$1@newshost.mot.com>
Guys,
I've been writing perl scripts at work on a w2k machine, but as I'm now
doing a personal project, I thought I'd better do it at home.
For various reasons, I'm still running w98 at home, and have discovered that
the w98 dos window is particularly crap, as I can't specify a buffer size.
If I put cmd.exe from my w2k machine onto the w98 machine, will it run OK,
and give me the dos window I'm used to, or is this a bad idea?
Are there any better ways around this?
Thanks.
--
R.
GPLRank +79.699
------------------------------
Date: Wed, 29 Oct 2003 16:53:00 +0100
From: Desmond Coughlan <pasdespam_desmond@zeouane.org>
Subject: Re: DOS window.
Message-Id: <sb4571-da42.ln1@zeouane.org>
Richard S Beckett <spikeywan@bigfoot.com.delete.this.bit> wrote ...
> I've been writing perl scripts at work on a w2k machine, but as I'm now
> doing a personal project, I thought I'd better do it at home.
>
> For various reasons, I'm still running w98 at home, and have discovered that
> the w98 dos window is particularly crap, as I can't specify a buffer size.
>
> If I put cmd.exe from my w2k machine onto the w98 machine, will it run OK,
> and give me the dos window I'm used to, or is this a bad idea?
I _think_ that it'll fail, for the simple reason that Windows 98 is a GUI
sitting on top of a shell, and Win 2000 is a native 32-bit OS.
The above might not make sense, but in short, if you run 'command.com' on a
Windows 98 machine, you're getting rid of the GUI (after a fashion), and
accessing what is running _behind_ it, whereas 'cmd.exe' on Windows 2000
_spawns_ a shell _from_ the OS.
Erm ... did the above make sense ?
--
Desmond Coughlan |desmond [at] zeouane [dot] org
http://www.zeouane.org/
------------------------------
Date: Wed, 29 Oct 2003 15:09:15 +0000 (UTC)
From: Stan Brown <stanb@panix.com>
Subject: Re: Finding out if a string has a trailing slash
Message-Id: <bnol6r$liq$1@reader2.panix.com>
In <bnmjsa$kpl$1@wisteria.csv.warwick.ac.uk> Ben Morrow <usenet@morrow.me.uk> writes:
>Stan Brown <stanb@panix.com> wrote:
>> I need to check a user suplied string to see if it has a trailing slash, or
>> not.
>>
>> I tried seomthing like:
>>
>> if( $dirname =~ m/\/$/ )
>You want to use m|/$| or so, here, to avoid Leaning Toothpick
>Syndrome. That's the whole point of Perl's choose-your-own-quotes.
>> But that's not working. What am I doing wrong?
>Worksforme:
> % perl -le'print ("foo/" =~ m/\/$/)'
> 1
> %
>What else does your script say, and what is it doing that you consider
>it to be 'not working'?
Thanks for the help, it was a stupid msitake on my part. I had 2 similar
variable names, and I confised them.
Thanks, again.
And, yes I changed the quotes to make it clearer.
--
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
-- Benjamin Franklin
------------------------------
Date: Wed, 29 Oct 2003 14:18:01 GMT
From: Steven Smolinski <steven.smolinski@sympatico.ca>
Subject: Re: help... this perl is different... null values are crashing my script.
Message-Id: <t_Pnb.3450$Nm6.226592@news20.bellglobal.com>
Tad McClellan <tadmc@augustmail.com> wrote:
> Eric J. Roode <REMOVEsdnCAPS@comcast.net> wrote:
>
>> Please do not post
>> MIME/multipart articles to usenet.
>
> Oh. That explains why I'm seeing followups without having seen the OP.
Could you share your scorefile entry for this amazing feature? I've
tried to score on the Content-Type: multipart/alternative header, but
for some reason I cannot fathom it does not catch posts like this.
Steve
------------------------------
Date: Wed, 29 Oct 2003 06:01:37 -0600
From: "Eric J. Roode" <REMOVEsdnCAPS@comcast.net>
Subject: Re: multiline regular expression, is it possible?
Message-Id: <Xns942347700787Esdn.comcast@216.196.97.136>
-----BEGIN xxx SIGNED MESSAGE-----
Hash: SHA1
leifwessman@hotmail.com (Leif Wessman) wrote in
news:64beeaad.0310290041.5c08a04@posting.google.com:
> Yes, maby I could. But I have more faith in Perl programmers... And
> regexp work almost the same in the two languages...
"Almost" probably isn't good enough. From a Perl point of view, there's
nothing wrong with your regular expression. I don't know PHP, so I don't
know if there's some difference in how the two languages do regular
expressions which is causing your problem. If I did, I'd probably hang out
in a PHP newsgroup. Assuming there are PHP newsgroups.
- --
Eric
$_ = reverse sort $ /. r , qw p ekca lre uJ reh
ts p , map $ _. $ " , qw e p h tona e and print
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------------------------------
Date: Wed, 29 Oct 2003 14:41:13 GMT
From: "Zachary Kent" <zkent@adelphia.net>
Subject: Re: multiline regular expression, is it possible?
Message-Id: <dkQnb.133331$qj6.9732069@news1.news.adelphia.net>
"Eric J. Roode" <REMOVEsdnCAPS@comcast.net> wrote in message
news:Xns942347700787Esdn.comcast@216.196.97.136...
> "Almost" probably isn't good enough. From a Perl point of view, there's
> nothing wrong with your regular expression. I don't know PHP, so I don't
> know if there's some difference in how the two languages do regular
> expressions which is causing your problem. If I did, I'd probably hang
out
> in a PHP newsgroup. Assuming there are PHP newsgroups.
The idea behind "preg..." in PHP is to utilize perl regex in PHP. However,
I don't know if it is using perl to power the preg regex or just borrowing
perl's syntax for consistency.
------------------------------
Date: 29 Oct 2003 11:56:59 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: opendchub script problem
Message-Id: <bno9ub$1p7$4@mamenchi.zrz.TU-Berlin.DE>
Raidenji <raidenji@bellsouth.net> wrote in comp.lang.perl.misc:
> is there a way to hide user input in a script for opendchub?
[...]
What do you mean when you say "hide user input"?
If you want the user to be able to type input without a terminal
echo, you may have a Perl question, and "perldoc -q password" may
answer it.
If the problem is that opendchup echoes back the user input, that has
nothing to do with Perl. You should ask the author(s), after having
studied the supplied documentation.
Anno
------------------------------
Date: 29 Oct 2003 07:48:15 -0800
From: rjohnson@shell.com (Roy Johnson)
Subject: Resetting //g
Message-Id: <3ee08638.0310290748.2a68e81c@posting.google.com>
If you short-circuit out of a global pattern match like so:
for (1..$n) {
$str =~ /($pat)/g;
$NthMatch = $1;
}
where there are more than $n matches, the next time you do
$str =~ /($pat)/g;
even if it's in a completely different block of code, the matching is
going to pick up where it left off. Is there a way to reset it, short
of whiling away the rest of the matches? (I tried several arguments
for the reset function.)
Incidentally, the best way to get the $nth match of $pat in $str is
$str =~ /(?:.*?($pat)){$n}/;
but I'm still curious about short-circuited global matches.
------------------------------
Date: Wed, 29 Oct 2003 16:00:17 +0000 (UTC)
From: Ben Morrow <usenet@morrow.me.uk>
Subject: Re: Resetting //g
Message-Id: <bnoo6h$hr4$1@wisteria.csv.warwick.ac.uk>
rjohnson@shell.com (Roy Johnson) wrote:
> If you short-circuit out of a global pattern match like so:
> for (1..$n) {
> $str =~ /($pat)/g;
> $NthMatch = $1;
> }
> where there are more than $n matches, the next time you do
> $str =~ /($pat)/g;
> even if it's in a completely different block of code, the matching is
> going to pick up where it left off. Is there a way to reset it, short
> of whiling away the rest of the matches? (I tried several arguments
> for the reset function.)
From perldoc perlop:
| The position after the last match can be read or set using the pos()
| function; see "pos" in perlfunc.
/Nota bene/ that you call pos on $str, not $pat.
> Incidentally, the best way to get the $nth match of $pat in $str is
> $str =~ /(?:.*?($pat)){$n}/;
> but I'm still curious about short-circuited global matches.
I would have said a better way would be
$nthmatch = ($str =~ /($pat)/g)[$n];
, not least because it actually works, but maybe that's just me... :)
Ben
--
"The Earth is degenerating these days. Bribery and corruption abound.
Children no longer mind their parents, every man wants to write a book,
and it is evident that the end of the world is fast approaching."
-Assyrian stone tablet, c.2800 BC ben@morrow.me.uk
------------------------------
Date: Wed, 29 Oct 2003 11:18:12 GMT
From: Bart Lateur <bart.lateur@pandora.be>
Subject: Re: Rounding a float in Perl?
Message-Id: <9f8vpvct93pq9iv8ptf7nb2mnmerpu2tqi@4ax.com>
Anno Siegel wrote:
>> But that doesn't allow you to specify the number of decimal places to
>> round to, does it?
>
>No, it doesn't. I don't remember the last time I wanted to round to
>anything but the nearest integer, but the objection is valid.
Think "currency".
--
Bart.
------------------------------
Date: 29 Oct 2003 11:27:58 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: Rounding a float in Perl?
Message-Id: <bno87u$1p7$3@mamenchi.zrz.TU-Berlin.DE>
Bart Lateur <bart.lateur@pandora.be> wrote in comp.lang.perl.misc:
> Anno Siegel wrote:
>
> >> But that doesn't allow you to specify the number of decimal places to
> >> round to, does it?
> >
> >No, it doesn't. I don't remember the last time I wanted to round to
> >anything but the nearest integer, but the objection is valid.
>
> Think "currency".
Oh, sure, it happens. Though, particularly with financial calculations,
an accepted technique is to first convert everything to cents (or whatever).
Anno
------------------------------
Date: Wed, 29 Oct 2003 16:00:32 GMT
From: "Jürgen Exner" <jurgenex@hotmail.com>
Subject: Re: Rounding a float in Perl?
Message-Id: <AuRnb.4440$Q9.3570@nwrddc02.gnilink.net>
Bart Lateur wrote:
> Anno Siegel wrote:
>
>>> But that doesn't allow you to specify the number of decimal places
>>> to round to, does it?
>>
>> No, it doesn't. I don't remember the last time I wanted to round to
>> anything but the nearest integer, but the objection is valid.
>
> Think "currency".
But you don't use floats for currency calculations.
jue
------------------------------
Date: Wed, 29 Oct 2003 15:15:27 +0000 (UTC)
From: Stan Brown <stanb@panix.com>
Subject: Video::Capture example?
Message-Id: <bnolif$liq$2@reader2.panix.com>
I'm writing a perl script to capture images from some cameras, and make
mpes out of them on Linux.
I't basicly working using system() calls to v4lctl, but that is slowing
things dow, spawning a seperate task for each capture.
I've found the Video::Captur module, and I think it's the way to go.
However it has no documentation for the calls, and the example programs
have no comments.
Could anyone point me to a working example of capturing an image using
this? I suspect I jyst need to traslate a couple of v4;ctl commands to the
corect syntax for using this module. EG:
system("/usr/bin/v4lctl -c $::config{video_dev} setinput $::config{video_type}");
and:
system("/usr/bin/v4lctl -c $::config{video_dev} snap jpeg 640x480 $tmpfile");
Any pointers to examples would be appreciated.
--
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
-- Benjamin Franklin
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
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Subject: Digest Administrivia (Last modified: 6 Apr 01)
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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.
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End of Perl-Users Digest V10 Issue 5724
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