[12275] in Perl-Users-Digest
Perl-Users Digest, Issue: 5876 Volume: 8
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Thu Jun 3 13:07:35 1999
Date: Thu, 3 Jun 99 10:01:29 -0700
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Thu, 3 Jun 1999 Volume: 8 Number: 5876
Today's topics:
Re: perl syntax error <hasant@trabas.co.id>
Re: perlcc and modules vishalb@my-deja.com
Re: problem in perl using the "chroot" command <nolanj00@mh.us.sbphrd.com>
Re: Q: Truncate a string <hasant@trabas.co.id>
require and the include stack under the covers... <agianni@acsu.buffalo.edu>
Ridicule ? (Re: String extraction problem - please help <gellyfish@gellyfish.com>
Re: String extraction problem - please help? <cassell@mail.cor.epa.gov>
Re: system command to string (DATE) <hasant@trabas.co.id>
Re: Test (Greg Bacon)
Re: Thanks! Re: multi-dimensional arrays (Greg Bacon)
Re: The artistic license and perl: <tchrist@mox.perl.com>
Re: The artistic license and perl: (Chris Nandor)
Re: turn cache off in IE (Greg Bacon)
while (@myarr) jbell@263.net
Re: while (@myarr) (Greg Bacon)
Why dones't this oneliner work? <sstarre@my-deja.com>
Special: Digest Administrivia (Last modified: 12 Dec 98 (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Thu, 3 Jun 1999 11:23:20 +0700 (JAVT)
From: Hasanuddin Tamir <hasant@trabas.co.id>
To: comp.lang.perl.misc@list.deja.com
Subject: Re: perl syntax error
Message-Id: <Pine.LNX.3.96.990603112030.15667B-100000@borg.intern.trabas.co.id>
On Wed, 26 May 1999, James Ahn wrote:
jahn] Date: Wed, 26 May 1999 16:31:46 -0400
jahn] From: James Ahn <jahn@bluecloud.com>
jahn] To: comp.lang.perl.misc@list.deja.com
jahn] Subject: perl syntax error
jahn] Reply-To: comp.lang.perl.misc@list.deja.com
jahn] Organization: PANIX Public Access Internet and UNIX, NYC
jahn]
jahn] Perl folks,
jahn]
jahn] I moved a CGI script I wrote in Perl from another server to my personal
jahn] account and when I did a 'perl -c filename' on it, I got syntax errors on this line:
jahn]
jahn] sub OpenLookup {
jahn]
jahn] # open the file for reading
jahn] open (LOOKUP, $lookup) || die "#2 Sorry, couldn't open $lookup";
You might want to add $! to find out the message
if error occures.
open (LOOKUP, $lookup) || die "#2 Sorry, couldn't open $lookup: $!";
jahn] # read the lookup file into a 2 dimensional array
jahn] while (<LOOKUP>) {
jahn] HERE --> push @theArray, [ split /,/ ];
jahn] }
I found no error running this code.
Are you sure it was as you typed here?
-hasan-
+================================================================+
Hasanuddin Tamir <hasant@trabas.co.id>
TRABAS Technical Dept. PT Meitraco Bahana Sejahtera
IT Solution Provider http://www.trabas.co.id/
Surya Sumantri Blok B1 No. 35 Phone: +62-22-216660
Setrasari Mall Bandung 40146 Fax : +62-22-2007633
+================================================================+
SORRY: I ignore most of attachments but plain text type
+================================================================+
"Pindah tempat itu bukan sekedar pindah koordinat,
tapi ada banyak hal yang terkandung di dalamnya."
--Boim, 1999/02/26
------------------------------
Date: Thu, 03 Jun 1999 07:25:51 GMT
From: vishalb@my-deja.com
Subject: Re: perlcc and modules
Message-Id: <7j5alq$9iv$1@nnrp1.deja.com>
In article <3755C92F.C8BCD490@cs.stanford.edu>,
"Amr A. Awadallah" <aaa@cs.stanford.edu> wrote:
>
> Dear Perlers,
>
> I have a problem with perlcc and modules. I have a script which uses
> the News::NNTPClient module. The script compiles fine, but when I run
the
> compiled binary I get this reponse:
>
> Can't locate object method "new" via package "News::NNTPClient" at
tmp.pl line
> 3.
>
> Any help would be really appreciated. I include the script I wrote
at the
> end of this message.
perl -V output please...
This problem should be missing from the latest development version
(perl5.005_57) though there might be other problems with it
regards,
vishal
>
> Thanks,
>
> -- Amr
>
> #!/usr/local/bin/perl -w
> # PRINT FIRST MESSAGE IN NEWSGROUP comp.lang.perl.misc
> use News::NNTPClient;
> $c = News::NNTPClient->new;
> ($first, $last) = ($c->group("comp.lang.perl.misc"));
> print $c->article($first);
> $c->quit;
>
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
Date: Wed, 02 Jun 1999 19:03:31 -0400
From: John Nolan <nolanj00@mh.us.sbphrd.com>
Subject: Re: problem in perl using the "chroot" command
Message-Id: <3755B843.3A96DD36@mh.us.sbphrd.com>
zenin@bawdycaste.org wrote:
>
> Vincent Rodts <vincent.rodts@cern.ch> wrote:
> : #!/usr/local/bin/perl5
> : chroot ("/root");
> : exec("ls");
> :
> : Without chroot, the ls command works, but with chroot, ls can't find any
> : files. The script is run as root, and this behaviour happens on different
> : systems. Is there an error in the way I use the chroot command ?
>
> Of course nothing is found, your root is now different. If you've
> chroot()ed to /root, it will be looking for "ls" in /root/bin/ls or
> similar. That's what chroot is *for*, to disable any and all access
> to any files higher then the directory you chroot to.
Yes, this is likely not a Perl problem, but a chroot problem.
>From a command prompt, make sure that you can chroot a shell
to that root, then run ls. If you can't do that at the
command prompt, then perl won't be able to do it either. :)
unix# chroot "/root" sh
unix# ls
If this does not work, then re-read the docs on chroot,
and then fix it.
Also, as always, use the -w flag in your Perl scripts.
If you do this, you might see a helpful error message, like so:
Can't exec "ls": No such file or directory at ./xyz line 4.
Good luck. :)
--John Nolan
------------------------------
Date: Thu, 3 Jun 1999 13:04:56 +0700 (JAVT)
From: Hasanuddin Tamir <hasant@trabas.co.id>
To: comp.lang.perl.misc@list.deja.com
Subject: Re: Q: Truncate a string
Message-Id: <Pine.LNX.3.96.990603125948.17030B-100000@borg.intern.trabas.co.id>
On Wed, 26 May 1999, milan andric wrote:
m-andric] Date: Wed, 26 May 1999 14:50:02 -0500
m-andric] From: milan andric <m-andric@uiuc.edu>
m-andric] To: comp.lang.perl.misc@list.deja.com
m-andric] Subject: Q: Truncate a string
m-andric] Reply-To: comp.lang.perl.misc@list.deja.com
m-andric] Organization: University of Illinois at Urbana-Champaign
m-andric]
m-andric]
m-andric] i'm trying to print only the first 8 letters of a string.. and i'm not
m-andric] sure what to use. perl has a function called truncate, but that doesn't
m-andric] seem to work for strings and character truncation. is the answer
m-andric] somewhere in the deep world of regular expressions?
$str = 'abcdefghijkl';
$str =~ s/(.{8}).*/$1/; # just a way by regex
$str = substr $str, 0, 8; # using substr()
It's up to you which way to use...
These commands will tell you more:
perldoc perlre
perldoc perlop
perldoc -f substr
-hasan-
+================================================================+
Hasanuddin Tamir <hasant@trabas.co.id>
TRABAS Technical Dept. PT Meitraco Bahana Sejahtera
IT Solution Provider http://www.trabas.co.id/
Surya Sumantri Blok B1 No. 35 Phone: +62-22-216660
Setrasari Mall Bandung 40146 Fax : +62-22-2007633
+================================================================+
SORRY: I ignore most of attachments but plain text type
+================================================================+
"Though we are together in our hearts,
There will always be a long distance."
--Kimberly (Long Distance), afom
------------------------------
Date: Thu, 03 Jun 1999 11:45:10 -0400
From: Andrew S Gianni <agianni@acsu.buffalo.edu>
Subject: require and the include stack under the covers...
Message-Id: <3756A306.C6451630@buffalo.edu>
I'm trying to figure out an efficency issue. In a script I'm trying to
get at a file. I know it's in one of a bunch of directories, but it'll
be a different file in a different directory depending on who's running
the script i.e. they're user configuration files and the directories are
named based on the first two letters of a users username. I've done some
benchmarking and it seems that it's faster to actually push all these
directories onto the include stack (with use lib) and then just do a
require "user.file" than it is to strip the first two characters off the
username and do require "/full/path/user.file".
I took this one step further and put the directory onto the include
stack before starting the benchmarking and then did a comparison of
doing a require "user.file" and require "/full/path/user.file" and it
took 2-3 times longer to give it the full path.
The thing that concerns me is that I'm using perl's benchmarking utility
timethese() which is running the operation 1000000 times or so for the
sake of gettnig decent results. I'm wondering if this is accurate to
compare with though because I'm not sure if these is caching involved
with the include stack. i.e. after you do a require once on something
that's in the include stack is something cached so it's easier to find
it a second time? If this is the case, it would invalidate the test. Or
is it just faster to push it onto the include stack because the include
stack always gets searched even if you give the full path?
If anyone knows more about the internals of how all this is done under
the covers, I'd appreciate some commentary.
Andrew
--
Andrew Gianni - Developer "You are about to be told one
UNIX Guy/Juggler Extraordinaire more time that you are America's
SUNY at Buffalo ACS/CIT most valuable natural resource...
ph:(716)645-3587x7009 Have you seen what they do to
fx:(716)645-3588 valuable natural resources?"
agianni@buffalo.edu -Utah Phillips
http://www.cs.buffalo.edu/~agianni/
------------------------------
Date: 3 Jun 1999 17:06:58 +0100
From: Jonathan Stowe <gellyfish@gellyfish.com>
Subject: Ridicule ? (Re: String extraction problem - please help)
Message-Id: <3756a822@newsread3.dircon.co.uk>
npolonsk@hotmail.com wrote:
>
> Finally, I don't like the idea of ridiculing someone for asking a
> question, no matter how stupid it may seem. The whole point of the
> usenet is to share information and ask seemingly stupid questions.
>
Your post appears to be a followup to that of David Cassell although
you do not quote his post. I dont think anyone in this thread has ridiculed
anyone. But I think you miss the point here - the whole point of UseNet
is *not* to 'ask seemingly stupid questions' as is pointed out in regular
postings in news.announce.newusers - this group like many others has a FAQ
and a poster is supposed to have the courtesy of attempting to answer their
question in there (and the other documentation) before posting.
/J\
--
Jonathan Stowe <jns@gellyfish.com>
------------------------------
Date: Thu, 03 Jun 1999 09:49:58 -0700
From: David Cassell <cassell@mail.cor.epa.gov>
To: Andrew Collington <webmaster@avert.org>
Subject: Re: String extraction problem - please help?
Message-Id: <3756B236.835B016F@mail.cor.epa.gov>
Andrew Collington wrote:
>
> Brian McCauley wrote:
> > Your problem is inability to read man pages.
>
> I only asked a simple (for you guys) question. There is no need for
> sarcasm or for you to put me down in any way like this. You could
> simply have said "hey, and if you want more information I suggest you
> read the xxxx man page". I mean, God damn it! Not everyone works in a
> [rest of angry reply snipped]
Sorry Andy, but everyone has their bad days. And many of the
responders here get those bad days by trying to answer questions.
Unfortunate, but true. People who ask questions like yours
are more likely to insist on being spoon-fed the answers, and
are more likely to get verbally abused. Not that you deserve
it! But if you read this ng regularly, you'll see the same
questions being asked over and over.. and over.. and over!
And TomC [who spends uncounted hours writing and re-writing
Perl docs] and many others eventually have a moment [or fifty]
where they vent that frustration.
> But other than that, thank you for your answer :) And thank you to
> those others as well that have answered it and helped me out. I know
> now a URL I can look up for help on regex, and I also know now to look
> into that whole m[] bit.
You're welcome. Perl has a fairly shallow learning curve
compared to many other programming languages, but it's a
long learning curve. Perl does many things, and so sooner
or later you have to learn many things. Learning how to
look stuff up in the Perl docs [not just the FAQ, but the
hundreds of pages of info that come with every Perl install]
will serve you well in future.
Has anyone told you about this URL:
http://www.perlmonth.com/articles//rtfm.html
You know what RTFM means - this is an article telling how
to do it efficiently.
HTH,
David
--
David Cassell, OAO cassell@mail.cor.epa.gov
Senior computing specialist
mathematical statistician
------------------------------
Date: Thu, 3 Jun 1999 14:07:17 +0700 (JAVT)
From: Hasanuddin Tamir <hasant@trabas.co.id>
To: comp.lang.perl.misc@list.deja.com
Subject: Re: system command to string (DATE)
Message-Id: <Pine.LNX.3.96.990603135227.18724B-100000@borg.intern.trabas.co.id>
On Wed, 26 May 1999, (BXTC) wrote:
bxtc] Date: Wed, 26 May 1999 19:36:40 GMT
bxtc] From: "(BXTC)" <bxtc@forfree.at>
bxtc] To: comp.lang.perl.misc@list.deja.com
bxtc] Subject: system command to string (DATE)
bxtc] Reply-To: comp.lang.perl.misc@list.deja.com
bxtc] Organization: Orbital Enterprises
bxtc]
bxtc] To start let me tell you I am new to Perl. This is what I need:
bxtc] I need to get the date from my system (linux) and put the output into a
bxtc] string.
bxtc] I read from someone else's post(and perldoc -f system), that calling
bxtc] 'date' from the system is not good because it isn't intended to capture
bxtc] the output, and someone said exec might be better. [....deleted
bxtc] ----]
You need backtick operation to capture output.
You can do it as well with system() in a bit longer way.
$date = `date`;
See perlfaq8 (perldoc perlfaq8) on questions:
How can I capture STDERR from an external command?
and
What's wrong with using backticks in a void context?
See also perldoc perlop.
If you only need date stamp you can call localtime() or
gmtime() in scalar context.
$date_stamp = localtime; ## Thu Jun 3 14:01:38 1999
If you need to produce more various date format like date
system command does, use strftime() from POSIX module.
use POSIX qw(strftime);
$date = strftime("%d%b%Y", localtime); ## 3Jun1999
it's equivalent to
chop($date = `date +"%d%b%Y"`);
HTH,
-hasan-
+================================================================+
Hasanuddin Tamir <hasant@trabas.co.id>
TRABAS Technical Dept. PT Meitraco Bahana Sejahtera
IT Solution Provider http://www.trabas.co.id/
Surya Sumantri Blok B1 No. 35 Phone: +62-22-216660
Setrasari Mall Bandung 40146 Fax : +62-22-2007633
+================================================================+
SORRY: I ignore most of attachments but plain text type
+================================================================+
"Mature is one thing, but wise is another one"
--bOkiR, 1998/02/22 02:30:05
------------------------------
Date: 3 Jun 1999 16:37:16 GMT
From: gbacon@itsc.uah.edu (Greg Bacon)
Subject: Re: Test
Message-Id: <7j6avs$7r2$3@info2.uah.edu>
In article <37568734.2F8FDD5@americasm01.nt.com>,
"M. S. Scott" <mikescot@americasm01.nt.com> writes:
: Perl monger wanna-be
Start by learning to use Usenet properly. Test messages belong in
alt.test, misc.test, or misc.test.moderated.
Greg
--
I'd call you an asshole, but an asshole is worth fucking once in awhile.
-- Kathy Thurber
------------------------------
Date: 3 Jun 1999 16:35:10 GMT
From: gbacon@itsc.uah.edu (Greg Bacon)
Subject: Re: Thanks! Re: multi-dimensional arrays
Message-Id: <7j6aru$7r2$2@info2.uah.edu>
In article <37572FC9.96C09468@nowhere.com>,
dana <dana@nowhere.com> writes:
: I think
: that this newsgroup has become significantly more friendly within the
: past 2 years. Wasn't too long ago that all I would get would be one
: line responses (e.g., "check the FAQ") and sarcastic comments.
I have a more plausible explanation. You got a helpful answer because
you didn't ask a FAQ. Hostile reponses to rudeness are not the same
as unfriendliness.
In case it will make you feel better, here are a few tips:
- Try to keep your lines around 72 columns or so.
- Please trim the quoting to the minimum necessary to maintain
context.
- Please, please, please do not leave all the quoted material at
the end. Please, please, please do not leave all the quoted
material at the beginning. Interleave the quoted material with
your responses to it.
Hope this helps! Have a nice day!
Greg
--
A great many people think they are thinking when they are merely rearranging
their prejudices.
-- William James
------------------------------
Date: 3 Jun 1999 10:04:25 -0700
From: Tom Christiansen <tchrist@mox.perl.com>
Subject: Re: The artistic license and perl:
Message-Id: <3756a789@cs.colorado.edu>
[courtesy cc of this posting mailed to cited author]
In comp.lang.perl.misc, pudge@pobox.com (Chris Nandor) writes:
:The AL cannot reasonably be a barrier for use of
:Perl, because it is completely optional.
But it's important. There have been very large companies whose lawyers
have contacted Larry for clarification. They aren't allowed to touch
the GPV (why why WHY won't people understand this issue?), so have to
use the AL, but want clarification. Larry always manages to talk them
into being happy with it all.
--tom
--
"I can only bend the rules so much before it starts looking like I'm breaking
the rules." --Larry Wall
------------------------------
Date: Thu, 03 Jun 1999 16:12:25 GMT
From: pudge@pobox.com (Chris Nandor)
Subject: Re: The artistic license and perl:
Message-Id: <pudge-0306991212290001@192.168.0.77>
In article <3756a789@cs.colorado.edu>, tchrist@mox.perl.com (Tom
Christiansen) wrote:
# [courtesy cc of this posting mailed to cited author]
#
# In comp.lang.perl.misc, pudge@pobox.com (Chris Nandor) writes:
# :The AL cannot reasonably be a barrier for use of
# :Perl, because it is completely optional.
#
# But it's important. There have been very large companies whose lawyers
# have contacted Larry for clarification. They aren't allowed to touch
# the GPV (why why WHY won't people understand this issue?), so have to
# use the AL,
Right, so in these cases, it is not the AL that is a barrier for use, but
a combination of the AL and GNU GPL. I think that is an important
distinction.
# but want clarification. Larry always manages to talk them
# into being happy with it all.
Perhaps Larry should publish a paper on the AL.
Note: I don't see the fact that lawyers asking for clarification as
evidence that the AL is significantly ambiguous. Lawyers ask for
clarification on all kinds of legal documents, all the time. And the idea
that it can be taken to mean something it wasn't meant to mean ... that
can, and probably will, happen in any event, no matter who drafts it or
how it is drafted.
--
Chris Nandor mailto:pudge@pobox.com http://pudge.net/
%PGPKey = ('B76E72AD', [1024, '0824090B CE73CA10 1FF77F13 8180B6B6'])
------------------------------
Date: 3 Jun 1999 16:37:55 GMT
From: gbacon@itsc.uah.edu (Greg Bacon)
Subject: Re: turn cache off in IE
Message-Id: <7j6b13$7r2$4@info2.uah.edu>
In article <37569960.33FD5603@interchange.ubc.ca>,
Nick Lee <leenick@interchange.ubc.ca> writes:
: Anyone knows how to turn OFF the cache in IE? I've tried using the
: header called Pragma (with a value of "no-cache"), but it seems to
: work only in NS, not in IE. IE still cache the document and doesn't
: reload unless I press 'refresh' explicitly.
What is your Perl question?
Greg
--
Why do people give each other flowers? To celebrate various important
occasions, they're killing living creatures? Why restrict it to plants?
"Sweetheart, let's make up. Have this deceased squirrel."
-- Jerry Seinfeld
------------------------------
Date: Thu, 03 Jun 1999 05:07:10 GMT
From: jbell@263.net
Subject: while (@myarr)
Message-Id: <7j52hq$6hk$1@nnrp1.deja.com>
when I say,
my @myarr = (1,2,3,4);
print $_ while @myarr;
According to the Camel book, this should be okay.
But it doesn't print 1234 as I expected. To top if off,
it runs into a infinite loop and says " Uninitialized variable..."
What seems to be the problem?
Thanks in advance.
----
Regards,
Jim B.
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
Date: 3 Jun 1999 16:42:23 GMT
From: gbacon@itsc.uah.edu (Greg Bacon)
Subject: Re: while (@myarr)
Message-Id: <7j6b9f$7r2$5@info2.uah.edu>
In article <7j52hq$6hk$1@nnrp1.deja.com>,
jbell@263.net writes:
: my @myarr = (1,2,3,4);
: print $_ while @myarr;
In Perl, boolean context is the same thing as scalar context. Your
code is the same as this:
my @myarr = (1,2,3,4);
while (scalar @myarr != 0) {
print $_;
}
You'll notice that $_ is never given a defined value (hence the
warnings you saw). You should also notice that this will continue
to loop forever unless acted upon by an outside SIGINT.
I think you're after code like
my @myarr = (1,2,3,4);
print foreach @myarr;
Greg
--
When going to visit the woman, do not forget the whip.
-- Nietzsche
------------------------------
Date: Thu, 03 Jun 1999 11:34:47 GMT
From: S Starre <sstarre@my-deja.com>
Subject: Why dones't this oneliner work?
Message-Id: <7j5p8n$d8n$1@nnrp1.deja.com>
Hi Perl-ers..
I have two lines that I'm trying to combine into 1. Basically I do a
conditional push, then increment $i:
THIS WORKS:
foreach (@y) {$_ && push @z,$x[$i]; $i++;}
THIS DOESN'T, but I don't know why not. The logic appears OK:
foreach (@y) {(($i++ + 1) && $_) && push @z,$x[$i];}
^
(Statement above ^ should always be true). In the latter, I'm not
certain that $i isn't incremented too soon, but I don't think it should
be until the entire block executes, which is the desired behavior.
The + 1 is there only to make the ^ true for all $i.
HUG && PAX,
S
(HUG)
-S
--
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
------------------------------
Date: 12 Dec 98 21:33:47 GMT (Last modified)
From: Perl-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Special: Digest Administrivia (Last modified: 12 Dec 98)
Message-Id: <null>
Administrivia:
Well, after 6 months, here's the answer to the quiz: what do we do about
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]From: Russ Allbery <rra@stanford.edu>
]Date: 21 Sep 1998 19:53:43 -0700
]Subject: comp.lang.perl.moderated available via e-mail
]
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------------------------------
End of Perl-Users Digest V8 Issue 5876
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