[29356] in Perl-Users-Digest
Perl-Users Digest, Issue: 600 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri Jun 29 06:10:14 2007
Date: Fri, 29 Jun 2007 03:09:05 -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, 29 Jun 2007 Volume: 11 Number: 600
Today's topics:
Re: Adding a line in a file inside many directories <joe@inwap.com>
Re: Adding a line in a file inside many directories <vedpsingh@gmail.com>
Re: Adding a line in a file inside many directories <noreply@gunnar.cc>
Re: Adding a line in a file inside many directories <vedpsingh@gmail.com>
Re: DBIx::Simple, fails with no error (not CGI this tim <justin.0706@purestblue.com>
lurking <invalid@invalid.nyet>
Re: lurking <bik.mido@tiscalinet.it>
Re: new in CGI::Session::Driver::postgredsql nonexistin <joe@inwap.com>
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@seesig.invalid
Re: Problem with PERL function <rvtol+news@isolution.nl>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Fri, 29 Jun 2007 00:38:07 -0700
From: Joe Smith <joe@inwap.com>
Subject: Re: Adding a line in a file inside many directories
Message-Id: <lMmdnb97UaB8KxnbnZ2dnUVZ_qupnZ2d@comcast.com>
Ved wrote:
> I have a 150 directories, each having a file "kat.s" in them.
> I have names of all these directories in a text file
> "list_of_dir.txt".
>
> I have to open the each of "kat.s" in all the 150 directories and add
> a line(say "ABCD" at line number 20) in each of them.
Separate the problem into two parts:
1) A loop that goes through the file names, one at a time.
2) A subroutine that deals with the process of editing a single file.
my $dir_list = 'list_of_dir.txt';
my $file_to_change = 'kat.s';
open my $fh,'<',$dir_list or die "Cannot read $dir_list: $!\n";
while (my $dir = <$fh>) {
chomp $dir;
my $file = "$dir/$file_to_change";
if (-e $file) {
process_one_file($file);
} else {
warn "File $file does not exist; skipping\n";
}
}
sub process_one_file {
my $file = shift;
print "Processing $file\n";
...
}
Unless you want to deal with the magic of perl's $^I variable (perldoc -q -i),
go with Gunnar's suggestion (perldoc Tie::File) for process_one_file.
-Joe
------------------------------
Date: Fri, 29 Jun 2007 08:30:52 -0000
From: Ved <vedpsingh@gmail.com>
Subject: Re: Adding a line in a file inside many directories
Message-Id: <1183105852.081757.290180@g37g2000prf.googlegroups.com>
On Jun 29, 12:38 pm, Joe Smith <j...@inwap.com> wrote:
> Ved wrote:
> > I have a 150 directories, each having a file "kat.s" in them.
> > I have names of all these directories in a text file
> > "list_of_dir.txt".
>
> > I have to open the each of "kat.s" in all the 150 directories and add
> > a line(say "ABCD" at line number 20) in each of them.
>
> Separate the problem into two parts:
> 1) A loop that goes through the file names, one at a time.
> 2) A subroutine that deals with the process of editing a single file.
>
> my $dir_list = 'list_of_dir.txt';
> my $file_to_change = 'kat.s';
> open my $fh,'<',$dir_list or die "Cannot read $dir_list: $!\n";
> while (my $dir = <$fh>) {
> chomp $dir;
> my $file = "$dir/$file_to_change";
> if (-e $file) {
> process_one_file($file);
> } else {
> warn "File $file does not exist; skipping\n";
> }
> }
>
> sub process_one_file {
> my $file = shift;
> print "Processing $file\n";
> ...
> }
>
> Unless you want to deal with the magic of perl's $^I variable (perldoc -q -i),
> go with Gunnar's suggestion (perldoc Tie::File) for process_one_file.
>
> -Joe
Hey Guys,
Thanks for the replies.
Joe I tried the code. This is what it is returning
######
File green_mcs020 /kat.s does not exist; skipping
File green_mcs0_40 /kat.s does not exist; skipping
File green_mcs0_20L /kat.s does not exist; skipping
File green_mcs0_40_20U /kat.s does not exist; skipping
#######
I think it is because the whitespace between the directory and file.
Directory file
green_mcs020(whitespace)/kat.s
Am I right ?
I did some chomp in the code but it didn't help. From where this
whitespace is coming in ?
After adding chomps code looks like this now :
#!/usr/local/bin/perl
use strict;
use warnings;
my $dir_list = 'my.tests';
chomp $dir_list ; ## added by me
my $file_to_change = 'katana.sv';
chomp $file_to_change ; ## added by me
open my $fh,'<',$dir_list or die "Cannot read $dir_list: $!\n";
while (my $dir = <$fh>) {
chomp $dir;
my $file = "$dir/$file_to_change";
print $file ; #added by me
if (-e $file) {
process_one_file($file);
} else {
warn "File $file does not exist; skipping\n";
}
}
sub process_one_file {
my $file = shift;
print "Processing $file\n";
# ...
}
------------------------------
Date: Fri, 29 Jun 2007 11:46:52 +0200
From: Gunnar Hjalmarsson <noreply@gunnar.cc>
Subject: Re: Adding a line in a file inside many directories
Message-Id: <5ek2tvF3993ttU1@mid.individual.net>
Ved wrote:
> Joe I tried the code. This is what it is returning
> ######
> File green_mcs020 /kat.s does not exist; skipping
> File green_mcs0_40 /kat.s does not exist; skipping
> File green_mcs0_20L /kat.s does not exist; skipping
> File green_mcs0_40_20U /kat.s does not exist; skipping
> #######
>
> I think it is because the whitespace between the directory and file.
>
> Directory file
> green_mcs020(whitespace)/kat.s
>
> Am I right ?
Sounds plausible...
> I did some chomp in the code but it didn't help. From where this
> whitespace is coming in ?
Maybe the file is corrupt. Try to run this from command line:
perl -pi -e 's/\s+$/\n/' my.tests
It should remove redundant trailing whitespace.
> After adding chomps code looks like this now :
>
> #!/usr/local/bin/perl
> use strict;
> use warnings;
>
> my $dir_list = 'my.tests';
> chomp $dir_list ; ## added by me
> my $file_to_change = 'katana.sv';
> chomp $file_to_change ; ## added by me
Please do not just do "some chomp". It's obvious that you don't know
what that function does, so you'd better check the applicable docs:
perldoc -f chomp
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
------------------------------
Date: Fri, 29 Jun 2007 09:59:11 -0000
From: Ved <vedpsingh@gmail.com>
Subject: Re: Adding a line in a file inside many directories
Message-Id: <1183111151.147458.160570@x35g2000prf.googlegroups.com>
On Jun 29, 1:30 pm, Ved <vedpsi...@gmail.com> wrote:
> On Jun 29, 12:38 pm, Joe Smith <j...@inwap.com> wrote:
>
>
>
>
>
> > Ved wrote:
> > > I have a 150 directories, each having a file "kat.s" in them.
> > > I have names of all these directories in a text file
> > > "list_of_dir.txt".
>
> > > I have to open the each of "kat.s" in all the 150 directories and add
> > > a line(say "ABCD" at line number 20) in each of them.
>
> > Separate the problem into two parts:
> > 1) A loop that goes through the file names, one at a time.
> > 2) A subroutine that deals with the process of editing a single file.
>
> > my $dir_list = 'list_of_dir.txt';
> > my $file_to_change = 'kat.s';
> > open my $fh,'<',$dir_list or die "Cannot read $dir_list: $!\n";
> > while (my $dir = <$fh>) {
> > chomp $dir;
> > my $file = "$dir/$file_to_change";
> > if (-e $file) {
> > process_one_file($file);
> > } else {
> > warn "File $file does not exist; skipping\n";
> > }
> > }
>
> > sub process_one_file {
> > my $file = shift;
> > print "Processing $file\n";
> > ...
> > }
>
> > Unless you want to deal with the magic of perl's $^I variable (perldoc -q -i),
> > go with Gunnar's suggestion (perldoc Tie::File) for process_one_file.
>
> > -Joe
>
> Hey Guys,
> Thanks for the replies.
>
> Joe I tried the code. This is what it is returning
> ######
> File green_mcs020 /kat.s does not exist; skipping
> File green_mcs0_40 /kat.s does not exist; skipping
> File green_mcs0_20L /kat.s does not exist; skipping
> File green_mcs0_40_20U /kat.s does not exist; skipping
> #######
>
> I think it is because the whitespace between the directory and file.
>
> Directory file
> green_mcs020(whitespace)/kat.s
>
> Am I right ?
>
> I did some chomp in the code but it didn't help. From where this
> whitespace is coming in ?
> After adding chomps code looks like this now :
>
> #!/usr/local/bin/perl
> use strict;
> use warnings;
>
> my $dir_list = 'my.tests';
> chomp $dir_list ; ## added by me
> my $file_to_change = 'katana.sv';
> chomp $file_to_change ; ## added by me
> open my $fh,'<',$dir_list or die "Cannot read $dir_list: $!\n";
> while (my $dir = <$fh>) {
> chomp $dir;
> my $file = "$dir/$file_to_change";
> print $file ; #added by me
> if (-e $file) {
> process_one_file($file);
> } else {
> warn "File $file does not exist; skipping\n";
> }
> }
>
> sub process_one_file {
> my $file = shift;
> print "Processing $file\n";
> # ...
> }- Hide quoted text -
>
> - Show quoted text -
Ok I did a chop to make it working.
chomp $dir;
chop $dir; #to get rid of whitespace
my $file = "$dir/$file_to_change";
------------------------------
Date: Fri, 29 Jun 2007 09:16:56 -0000
From: Justin C <justin.0706@purestblue.com>
Subject: Re: DBIx::Simple, fails with no error (not CGI this time!)
Message-Id: <5a81.4684ce08.4b2d@zem>
On 2007-06-29, Paul Lalli <mritty@gmail.com> wrote:
> On Jun 28, 7:21 pm, Justin C <justin.0...@purestblue.com> wrote:
>
>> I can't find, in perldoc -q or -f anything relating to an 'END'.
>
> You're not alone.
>
>> Could you point me at some docs
>> to explain what is going on there?
>
> For no real good reason I've ever been able to find, BEGIN{}, INIT{},
> CHECK{}, and END{} are all described in `perldoc perlmod`.
Thanks Paul, and Tad. I'll read it now...
Ahh! Useful stuff. I'm going to re-read Paul's suggestion for an END{}
code block and drop one in. Thanks again.
Justin.
--
Justin Catterall www.masonsmusic.co.uk
Director T: +44 (0)1424 427562
Masons Music Ltd F: +44 (0)1424 434362
For full company details see our web site
------------------------------
Date: Fri, 29 Jun 2007 03:24:25 -0400
From: "Wade Ward" <invalid@invalid.nyet>
Subject: lurking
Message-Id: <-qqdnRDEdph8LhnbnZ2dnUVZ_ryknZ2d@comcast.com>
I just wanted to mention that I'm following the standard wisdom in this
forum to lurk for 2 weeks before waxing categorical.
Our public library has a half a dozen decent references for perl.
--
Wade Ward
------------------------------
Date: Fri, 29 Jun 2007 10:33:25 +0200
From: Michele Dondi <bik.mido@tiscalinet.it>
Subject: Re: lurking
Message-Id: <hqg983to2bta5n7jo7t6ccj2gkiqrehf94@4ax.com>
On Fri, 29 Jun 2007 03:24:25 -0400, "Wade Ward" <invalid@invalid.nyet>
wrote:
>I just wanted to mention that I'm following the standard wisdom in this
>forum to lurk for 2 weeks before waxing categorical.
Well done, but lurking is generally done in the shadow. So making this
public one may argue that you're meta-lurking. Or not? :-)
BTW: due to English not being my native language I can't understand
the "waxing categorical" expression: care to explain it?
>Our public library has a half a dozen decent references for perl.
And? Is this meant to be a positive or negative comment? (Too many?
Too few?)
Michele
--
{$_=pack'B8'x25,unpack'A8'x32,$a^=sub{pop^pop}->(map substr
(($a||=join'',map--$|x$_,(unpack'w',unpack'u','G^<R<Y]*YB='
.'KYU;*EVH[.FHF2W+#"\Z*5TI/ER<Z`S(G.DZZ9OX0Z')=~/./g)x2,$_,
256),7,249);s/[^\w,]/ /g;$ \=/^J/?$/:"\r";print,redo}#JAPH,
------------------------------
Date: Fri, 29 Jun 2007 00:51:32 -0700
From: Joe Smith <joe@inwap.com>
Subject: Re: new in CGI::Session::Driver::postgredsql nonexisting
Message-Id: <59udnbCew7KYJxnbnZ2dnUVZ_ofinZ2d@comcast.com>
IDK wrote:
> With strict I only get loads of:
> login: Global symbol "$s" requires explicit package name at ./login
> line 25.
>
> $s = sqlQuerry("SELECT id, pass FROM zerus.players WHERE
> name='$user'")
Put "my" in front of the first time where the variable $s is used.
my $s = sqlQuerry...
------------------------------
Date: Fri, 29 Jun 2007 07:10:45 GMT
From: tadmc@seesig.invalid
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
Message-Id: <Vf2hi.42702$5j1.42330@newssvr21.news.prodigy.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.8 $)
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
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The article at:
http://www.catb.org/~esr/faqs/smart-questions.html
describes how to get answers from technical people in general.
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:
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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":
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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
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Check the Perl Frequently Asked Questions (FAQ)
Checking the FAQ before posting is required in Big 8 newsgroups in
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You are expected to do this in nearly all newsgroups.
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Check the other standard Perl docs (*.pod)
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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.
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Try doing a word-search in the standard docs for some words/phrases
taken from your problem statement or from your very carefully worded
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Really Really Should
This section describes things that you *really should* do before posting
to clpmisc.
Lurk for a while before posting
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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"
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These sections describe how you can help keep your article from being
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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,
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It should be understood that you may not know that the root of your
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How to participate (post) in the clpmisc community
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You have 40 precious characters of Subject to win out and be one of
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For more information on choosing a Subject see "Choosing Good
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Use an effective followup style
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Speak Perl rather than English, when possible
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Instead say: I have $var = "foo\tbar", or I have $var = 'foo\tbar',
or I have $var = <DATA> (and show the data line).
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Use copy/paste or your editor's "import" function rather than
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Provide enough information
If you do the things in this item, you will have an Extremely Good
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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
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Describe *precisely* the input to your program. Also provide example
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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
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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
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annoyed.
If you are flamed for not checking when you *did* check, then just
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Asking for emailed answers
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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 and many others on the comp.lang.perl.misc newsgroup.
--
Tad McClellan
email: perl -le "print scalar reverse qq/moc.noitatibaher\100cmdat/"
------------------------------
Date: Fri, 29 Jun 2007 10:03:44 +0200
From: "Dr.Ruud" <rvtol+news@isolution.nl>
Subject: Re: Problem with PERL function
Message-Id: <f62lfp.1eg.1@news.isolution.nl>
michaelzhao schreef:
> jerkoff
*PLONK*
--
Affijn, Ruud
"Gewoon is een tijger."
------------------------------
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>
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------------------------------
End of Perl-Users Digest V11 Issue 600
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