Re: assigning list to hash entry
Thanks for replying!
Actually, I have a highly complex datastructure in which both strings,
lists and hashes are values in a primary hash.
e.g.
$hash{$key}[0] = @list;
$hash{$key}[1] = $string;
$hash{$key}[2] = %hash;
I need to assign these values to a specific (number)entry in the primary
hash, so I know which entry has which value.
Anders.
Shawn Corey [EMAIL PROTECTED] 01/15/06 7:16 pm
Anders Stegmann wrote:
Hi!
how do I assign a list to a hash entry like $hash{$key}[0].
I mean, something like this:
$hash{$key}[0] = @list;
must work.
Anders.
Close. Try:
use Data::Dumper;
$hash{$key} = [ @list ];
print Dumper( \%hash );
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--- Shawn
Probability is now one. Any problems that are left are your own.
SS Heart of Gold, _The Hitchhiker's Guide to the
* Perl tutorials at http://perlmonks.org/?node=Tutorials
* A searchable perldoc is available at http://perldoc.perl.org/
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Re: assigning list to hash entry
On Jan 16, 2006, at 9:03, Anders Stegmann wrote:
Actually, I have a highly complex datastructure in which both strings,
lists and hashes are values in a primary hash.
e.g.
$hash{$key}[0] = @list;
$hash{$key}[1] = $string;
$hash{$key}[2] = %hash;
In Perl data estructures can only store scalar values. That's why
references are used to emulate nested structures:
$hash{$key}[0] = [EMAIL PROTECTED]; # note that @s are arrays, not lists
$hash{$key}[1] = $string;
$hash{$key}[2] = \%hash;
There are some pages in the documentation about nested estructures,
have a glance at perldsc for instance.
-- fxn
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Re: about the var's scope
Shawn Corey am Montag, 16. Januar 2006 04.12:
[...]
Ok, it would be interesting to look deeper into the mess of different
variables all named with the same name $q, exported across the modules,
overwritten by several imports...
What do you want to achieve with your code? It looks really strange (hm,
at least to me).
joe
All the variables $q in the packages have been shunted aside into the
deep, dark bit bucket of oblivion.
As I said before:
$main::q = \*My::HTML::q;
$main::q = \*My::Doc::q;
$My::HTML::q and $My::Doc::q no longer exist; they are aliases to
$main::q. In the modules, $q no longer exists; it is an alias for
$main::q. Whenever you say $q in the modules, you really mean $main::q.
The modules do not import anything; they export any changes to $main::q;
via the phrase '$q'.
Hi again Shawn,
I have a question concerning the code presented in the OP. I repeat it for
better overview:
Version 1
script.pl:
use vars qw($q);
use CGI;
use lib qw(.);
use My::HTML qw($q); # My/HTML.pm is in the same dir as script.pl
use My::Doc qw($q); # Ditto
$q = new CGI;
My::HTML::printmyheader();
My/HTML.pm
package My::HTML;
use strict;
BEGIN {
use Exporter ();
@My::HTML::ISA = qw(Exporter);
@My::HTML::EXPORT = qw();
@My::HTML::EXPORT_OK = qw($q);
}
use vars qw($q);
use My::Doc qw($q);
sub printmyheader{
# Whatever you want to do with $q... e.g.
print $q-header();
My::Doc::printtitle('Guide');
}
1;
My/Doc.pm
package My::Doc;
use strict;
BEGIN {
use Exporter ();
@My::Doc::ISA = qw(Exporter);
@My::Doc::EXPORT = qw();
@My::Doc::EXPORT_OK = qw($q);
}
use vars qw($q);
sub printtitle{
my $title = shift || 'None';
print $q-h1($title);
}
1;
END Version 1
The code demonstrates the usage of the use vars pragma and the Exporter.
However, my personal feeling ist that in a bigger project it is eventually bad
style to use globals this way?!?
Do you agree? Or do I - again - overlook something?
See the equivalent code below as an alternative:
Version 2
script.pl:
use CGI;
use lib qw(.);
use My::HTML;
my $q = new CGI;
My::HTML::printmyheader($q);
My/HTML.pm
package My::HTML;
use strict;
use My::Doc;
sub printmyheader{
my $q=shift;
### DO CHECKS HERE
# Whatever you want to do with $q... e.g.
print $q-header();
My::Doc::printtitle($q, 'Guide');
}
1;
My/Doc.pm
package My::Doc;
use strict;
sub printtitle{
my $q=shift;
### DO CHECKS HERE
my $title = shift || 'None';
print $q-h1($title);
}
1;
END Version 2
This version does the same, is shorter, is easier to understand for some
people, does not require Exporter, and does not need use'ing My::Doc in the
main script (it's more modular).
Does this 2nd version lack any features/magic present in the 1st?
(Apart from demonstrating use vars / Exporter of course)
Any comments are very appreciated!
greetings
joe
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Re: about the var's scope
I think the only difference between the two is Stat's code do the things of
sharing vars across modules really.
Under mod_perl,the situation is very different from common CGI environment,and
the vars sharing sometimes is useful and needed.
I hope I'm correct.If not,the criticism are welcome.
-Original Message-
From: John Doe [EMAIL PROTECTED]
Sent: Jan 16, 2006 4:09 AM
To: beginners@perl.org
Subject: Re: about the var's scope
Shawn Corey am Montag, 16. Januar 2006 04.12:
[...]
Ok, it would be interesting to look deeper into the mess of different
variables all named with the same name $q, exported across the modules,
overwritten by several imports...
What do you want to achieve with your code? It looks really strange (hm,
at least to me).
joe
All the variables $q in the packages have been shunted aside into the
deep, dark bit bucket of oblivion.
As I said before:
$main::q = \*My::HTML::q;
$main::q = \*My::Doc::q;
$My::HTML::q and $My::Doc::q no longer exist; they are aliases to
$main::q. In the modules, $q no longer exists; it is an alias for
$main::q. Whenever you say $q in the modules, you really mean $main::q.
The modules do not import anything; they export any changes to $main::q;
via the phrase '$q'.
Hi again Shawn,
I have a question concerning the code presented in the OP. I repeat it for
better overview:
Version 1
script.pl:
use vars qw($q);
use CGI;
use lib qw(.);
use My::HTML qw($q); # My/HTML.pm is in the same dir as script.pl
use My::Doc qw($q); # Ditto
$q = new CGI;
My::HTML::printmyheader();
My/HTML.pm
package My::HTML;
use strict;
BEGIN {
use Exporter ();
@My::HTML::ISA = qw(Exporter);
@My::HTML::EXPORT = qw();
@My::HTML::EXPORT_OK = qw($q);
}
use vars qw($q);
use My::Doc qw($q);
sub printmyheader{
# Whatever you want to do with $q... e.g.
print $q-header();
My::Doc::printtitle('Guide');
}
1;
My/Doc.pm
package My::Doc;
use strict;
BEGIN {
use Exporter ();
@My::Doc::ISA = qw(Exporter);
@My::Doc::EXPORT = qw();
@My::Doc::EXPORT_OK = qw($q);
}
use vars qw($q);
sub printtitle{
my $title = shift || 'None';
print $q-h1($title);
}
1;
END Version 1
The code demonstrates the usage of the use vars pragma and the Exporter.
However, my personal feeling ist that in a bigger project it is eventually bad
style to use globals this way?!?
Do you agree? Or do I - again - overlook something?
See the equivalent code below as an alternative:
Version 2
script.pl:
use CGI;
use lib qw(.);
use My::HTML;
my $q = new CGI;
My::HTML::printmyheader($q);
My/HTML.pm
package My::HTML;
use strict;
use My::Doc;
sub printmyheader{
my $q=shift;
### DO CHECKS HERE
# Whatever you want to do with $q... e.g.
print $q-header();
My::Doc::printtitle($q, 'Guide');
}
1;
My/Doc.pm
package My::Doc;
use strict;
sub printtitle{
my $q=shift;
### DO CHECKS HERE
my $title = shift || 'None';
print $q-h1($title);
}
1;
END Version 2
This version does the same, is shorter, is easier to understand for some
people, does not require Exporter, and does not need use'ing My::Doc in the
main script (it's more modular).
Does this 2nd version lack any features/magic present in the 1st?
(Apart from demonstrating use vars / Exporter of course)
Any comments are very appreciated!
greetings
joe
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Combine multiple lines into one line
Hi all, I have the file, which looks like: *RECORD* *ID* 001 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract... Second line of the abstract. *RECORD* *ID* 002 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract... Second line of the abstract. Is there any simple way to transform this file to look like: *RECORD* *ID* 001 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract. Second line of the abstract. Thanks in advance for any pointers or notes. Cheers, Andre -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: Combine multiple lines into one line
On Monday 16 January 2006 14:32, Andrej Kastrin wrote:
Hi all,
Hi Andrej
I have the file, which looks like:
*RECORD*
*ID*
001
*TITLE*
Here is title number one.
*ABSTRACT*
First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
*RECORD*
*ID*
002
*TITLE*
Here is title number one.
*ABSTRACT*
First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
Is there any simple way to transform this file to look like:
*RECORD*
*ID* 001
*TITLE* Here is title number one.
*ABSTRACT* First sentence of the abstract. Second sentence of the
abstract. Second line of the abstract.
Thanks in advance for any pointers or notes.
I'm also new to this game, but I'll try:
#!/usr/bin/perl
open FILEHANDLE, yourfile.txt or die die\n;
#optional
use strict;
#declare array
my @line;
# go trough each line
# shortcut for:
# my $_;
# while ( defined ( $_ = FILEHANDLE ) ) {
while ( FILEHANDLE ) {
# cut off trailing newline
# shortcut for:
# chomp $_;
chomp;
#push the line to the array
push ( @line, $_ );
}
# join the elements of the array and print them
print join( , @line);
close FILEHANDLE;
I guess this should give you some hints about how to manipulate those files of
yours, since you don't want to join *all* the file in one line. One way can
be to check for lines beginning with '*' (using regexp /^\*/ or something
similar) and print those lines with a newline-prefix and the others with a
single-space-prefix.
There is probably some fancy shortcut for doing all of this in one line, but I
don't know it. Yet...
Enjoy!
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perl-module ParseLex-2.15 install fails on make test
System: Fedora Core 4 on a AMD64. I've tried using the cpan-command install Parse::Lex and the manual 'perl Makefile.pl make make test'(it fails on the test) Let me know if this is the wrong list, but I really am a beginner when it comes to perl. I am trying to install a Live Access Server made in perl. Here is the output: ### [EMAIL PROTECTED] ParseLex-2.15]# perl Makefile.PL Checking if your kit is complete... Looks good Writing Makefile for Parse::Lex [EMAIL PROTECTED] ParseLex-2.15]# make cp lib/Parse/ALex.pm blib/lib/Parse/ALex.pm cp lib/Parse/Token.pm blib/lib/Parse/Token.pm cp lib/Parse/Token-t.pm blib/lib/Parse/Token-t.pm cp lib/Parse/CLex.pm blib/lib/Parse/CLex.pm cp lib/Parse/YYLex.pm blib/lib/Parse/YYLex.pm cp lib/Parse/LexEvent.pm blib/lib/Parse/LexEvent.pm cp lib/Parse/Template.pm blib/lib/Parse/Template.pm cp lib/Parse/Lex.pm blib/lib/Parse/Lex.pm cp lib/Parse/Trace.pm blib/lib/Parse/Trace.pm Manifying blib/man3/Parse::Token.3pm Manifying blib/man3/Parse::Template.3pm Manifying blib/man3/Parse::CLex.3pm Manifying blib/man3/Parse::YYLex.3pm Manifying blib/man3/Parse::Lex.3pm Manifying blib/man3/Parse::LexEvent.3pm [EMAIL PROTECTED] ParseLex-2.15]# make test PERL_DL_NONLAZY=1 /usr/bin/perl -MExtUtils::Command::MM -e test_harness(0, 'blib/lib', 'blib/arch') t/*.t t/test1FAILED test 1 Failed 1/1 tests, 0.00% okay t/test2FAILED test 1 Failed 1/1 tests, 0.00% okay t/test3FAILED test 1 Failed 1/1 tests, 0.00% okay t/test4FAILED test 1 Failed 1/1 tests, 0.00% okay t/test5FAILED test 1 Failed 1/1 tests, 0.00% okay t/test6FAILED test 1 Failed 1/1 tests, 0.00% okay t/test7FAILED test 1 Failed 1/1 tests, 0.00% okay Failed Test Stat Wstat Total Fail Failed List of Failed --- t/test1.t 11 100.00% 1 t/test2.t 11 100.00% 1 t/test3.t 11 100.00% 1 t/test4.t 11 100.00% 1 t/test5.t 11 100.00% 1 t/test6.t 11 100.00% 1 t/test7.t 11 100.00% 1 Failed 7/7 test scripts, 0.00% okay. 7/7 subtests failed, 0.00% okay. make: *** [test_dynamic] Error 255 [EMAIL PROTECTED] ParseLex-2.15]# ### Any ideas? -- Bjørge Solli - Office:+47 55205847 cellph.:+47 91614343 Nansen Environmental and Remote Sensing Center - Bergen, Norway http://www.nersc.no Reception: +47 55205800 Dept.: Mohn-Sverdrup Center for Global Ocean Studies and Operational Oceanography -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
How to take a reference in line
Using the example below (partially taken from Learning PERL Objects), I
can't seem to figure out how to take a reference to an array in-line.
See the last 2 lines:
#!/usr/bin/perl
use Data::Dumper;
sub check_required_items {
my $who = shift;
my $items = shift;
my @required = qw(preserver sunscreen water_bottle jacket);
print \n\n;
print Dumper $items;
for my $item (@required) {
print Checking $item:;
unless (grep $item eq $_, @{$items}) { # not found in list?
print $who is missing $item.\n;
} else {
print OK!\n;
}
}
}
my $arrayPointer;
# This works:
@{$arrayPointer}=qw(Money preserver sunscreen);
check_required_items(Mr. Howell, $arrayPointer);
# These don't work:
check_required_items(Mr. Howell, @{$arrayPointer}=qw(Money preserver
sunscreen));
check_required_items(Mr. Howell, qw(Money preserver sunscreen));
How do I tell Perl to give me a reference to an array in the last 2
statements? There's got to be a way to pass a reference without having
to explicitly name a variable. Right?
Thank You
--
Bill Gradwohl
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Re: Combine multiple lines into one line
Andrej Kastrin am Montag, 16. Januar 2006 14.32:
Hi all,
I have the file, which looks like:
*RECORD*
*ID*
001
*TITLE*
Here is title number one.
*ABSTRACT*
First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
*RECORD*
*ID*
002
*TITLE*
Here is title number one.
*ABSTRACT*
First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
Is there any simple way to transform this file to look like:
*RECORD*
*ID* 001
*TITLE* Here is title number one.
*ABSTRACT* First sentence of the abstract. Second sentence of the
abstract. Second line of the abstract.
Thanks in advance for any pointers or notes.
Cheers, Andre
The following does what you want in a somehow generic way (except from the
additional empty line at the very end), but it is more short than simple, and
there must exist an easier regex I have not found:
use strict; use warnings;
local $/=;
while(DATA) {
s/((?=\*)|(?!\*))\n(?!\*|$)/ /gms;
print;
}
__DATA__
*RECORD*
*ID*
001
*TITLE*
Here is title number one.
*ABSTRACT*
First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
*RECORD*
*ID*
002
*TITLE*
Here is title number one.
*ABSTRACT*
First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
### prints:
*RECORD*
*ID* 001
*TITLE* Here is title number one.
*ABSTRACT* First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
*RECORD*
*ID* 002
*TITLE* Here is title number one.
*ABSTRACT* First sentence of the abstract. Second sentence of the abstract...
Second line of the abstract.
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Re: about the var's scope
Jeff Pang wrote: I think the only difference between the two is Stat's code do the things of sharing vars across modules really. Under mod_perl,the situation is very different from common CGI environment,and the vars sharing sometimes is useful and needed. I hope I'm correct.If not,the criticism are welcome. The OP was asking about understanding the code, not what are the best practices. First of all, I would never call an object by a single letter. Something like $CGI_Obj would be better. And being a global, it starts with a capital. Yes, I would be more inclined to pass the object to the subroutines than use it as a global. I would use Exporter only to export subroutines, not variables because, as discussed, it is difficult to understand what is happening. I don't use mod_perl but my understanding it that it doesn't, or didn't, reset the globals to the default state (which is undef). Of course, setting all your variables to a known state before using them is consider good practice; so you should never encounter this problem ;) -- Just my 0.0002 million dollars worth, --- Shawn Probability is now one. Any problems that are left are your own. SS Heart of Gold, _The Hitchhiker's Guide to the Galaxy_ * Perl tutorials at http://perlmonks.org/?node=Tutorials * A searchable perldoc is available at http://perldoc.perl.org/ -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: assigning list to hash entry
Xavier Noria wrote:
In Perl data estructures can only store scalar values. That's why
references are used to emulate nested structures:
$hash{$key}[0] = [EMAIL PROTECTED]; # note that @s are arrays, not lists
$hash{$key}[1] = $string;
$hash{$key}[2] = \%hash;
There are some pages in the documentation about nested estructures,
have a glance at perldsc for instance.
An alternative would be:
$hash{$key}[0] = [ @array ];
and
$hash{$key}[2] = { %hash };
Here you are making a copy of the the array and hash. In the above, if
you change @array or %hash, then the contents of $hash{$key}[0] and
$hash{$key}[2] also change. It depends in what you want; sometimes you
want it one way, sometimes the other.
Also you could have written:
$hash{$key}[1] = \$string;
So that when $string changes, $hash{$key}[1] also changes.
--
Just my 0.0002 million dollars worth,
--- Shawn
Probability is now one. Any problems that are left are your own.
SS Heart of Gold, _The Hitchhiker's Guide to the Galaxy_
* Perl tutorials at http://perlmonks.org/?node=Tutorials
* A searchable perldoc is available at http://perldoc.perl.org/
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Re: Combine multiple lines into one line
Andrej Kastrin wrote: Hi all, I have the file, which looks like: *RECORD* *ID* 001 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract... Second line of the abstract. *RECORD* *ID* 002 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract... Second line of the abstract. Is there any simple way to transform this file to look like: *RECORD* *ID* 001 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract. Second line of the abstract. A one-liner: $ perl -lp0e 's/\n(?!\*[A-Z]+\*)/ /g' myfile.dat How it works: 1. Read input in paragraph mode (-0) option 2. Join any line that does not begin with *LETTERS* with the preceding line. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: interpolation
John Doe wrote:
The Ghost am Montag, 16. Januar 2006 06.34:
I am storing text stings in a database. when I have the string:
'some perl $variable'
which would print as:
some perl $variable
how can I force interpolation of '$variable'?
one idea I thought of was:
#!/usr/bin/perl
my $var='variable';
$string='some $var';
$string=~s/\$(\w+)/${$1}/gi;
print $string\n;
But it doesn't work. I want it to print some variable.
One way is to change the regex a bit:
#!/usr/bin/perl
use strict;
use warnings;
my $var='variable';
my $other_var='another';
my ($string1, $string2, $string3)=map 'some $var $other_var', 1..3;
# test1, test2, final version:
#
$string1=~s/(\$\w+)/$1/g;
$string2=~s/(\$\w+)/$1/ge;
$string3=~s/(\$\w+)/$1/gee;
print join \n, $string1, $string2, $string3;
greetings
joe
Usually it is considered a bad idea to interpolate external strings. You
could have your users printing any variable. Consider using sprintf
instead (see `perldoc -f sprintf`).
my $format = 'some perl %s';
my $string = sprintf $format, $variable;
print $string\n;
--
Just my 0.0002 million dollars worth,
--- Shawn
Probability is now one. Any problems that are left are your own.
SS Heart of Gold, _The Hitchhiker's Guide to the Galaxy_
* Perl tutorials at http://perlmonks.org/?node=Tutorials
* A searchable perldoc is available at http://perldoc.perl.org/
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Array of hashes
Hi All Can anyone tell me whether there is any way for declaring an array of hashes similar to creating array of structure variables in C programming? Thanks Best regards Bala The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: How to take a reference in line
Bill Gradwohl wrote:
my $arrayPointer;
# This works:
@{$arrayPointer}=qw(Money preserver sunscreen);
check_required_items(Mr. Howell, $arrayPointer);
# These don't work:
check_required_items(Mr. Howell, @{$arrayPointer}=qw(Money preserver
sunscreen));
check_required_items(Mr. Howell, qw(Money preserver sunscreen));
How do I tell Perl to give me a reference to an array in the last 2
statements? There's got to be a way to pass a reference without having
to explicitly name a variable. Right?
Try:
check_required_items(Mr. Howell, $arrayPointer=[qw(Money preserver
sunscreen)] );
check_required_items(Mr. Howell, [qw(Money preserver sunscreen)] );
--
Just my 0.0002 million dollars worth,
--- Shawn
Probability is now one. Any problems that are left are your own.
SS Heart of Gold, _The Hitchhiker's Guide to the Galaxy_
* Perl tutorials at http://perlmonks.org/?node=Tutorials
* A searchable perldoc is available at http://perldoc.perl.org/
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Re: Array of hashes
[EMAIL PROTECTED] wrote:
Hi All
Can anyone tell me whether there is any way for declaring an array of
hashes similar to creating array of structure variables in C
programming?
There is a module, Class::Struct, that might be what you want. See
`perldoc Class:Struct`.
However, I would simply build the array of hashes as I go:
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
my @ArrayOfHashes = ();
for my $count ( 1 .. 10 ){
my %hash = ();
for my $key ( 'a' .. 'z' ){
my $value = rand;
$hash{$key} = $value;
}
push @ArrayOfHashes, { %hash };
}
print Dumper [EMAIL PROTECTED];
__END__
--
Just my 0.0002 million dollars worth,
--- Shawn
Probability is now one. Any problems that are left are your own.
SS Heart of Gold, _The Hitchhiker's Guide to the Galaxy_
* Perl tutorials at http://perlmonks.org/?node=Tutorials
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RE: [Win32] Basic I/O Question
The diamond operator works fine without escaping your backslashes, but I recommend putting quotes around your arguments. The following works just fine for me: c:\ while.pl c:\documents and settings\username\desktop\file.txt If you want to use the less-than operator (or a pipe), then you have to explicitly state that you are using perl.exe. cmd.exe can't derive implicitly the program you are invoking via the extension. For example: c:\ perl.exe while.pl ..\myfile.txt -Original Message- From: Hardly Armchair [mailto:[EMAIL PROTECTED] Sent: Sunday, January 15, 2006 6:41 PM To: beginners@perl.org Subject: [Win32] Basic I/O Question Hello List, I am running Perl for Win32 and have been executing my programs through the 'cmd.exe' shell. I am confused about how to input paths to files in a command-line context so that perl will understand. Using the diamond operator () in my programs allows me to type my program at the command line followed by the filename to get the program to work on the file: foo.plx filename.txt#works However, when I use standard input (STDIN) and use the less than character to do the same thing, the file is ignored: foo.plx filename.txt #no dice snip -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: dprofpp
On Fri, 13 Jan 2006, Gerard Robin wrote: And, what are exactly Elapsed Time and User+System Time ? If i run time ./dprof1.pl the outputs are: real0m0.033s user0m0.011s sys 0m0.002s If i run time ./dprof3.pl the outputs are: real0m0.059s user0m0.018s sys 0m0.004s What relation exists between the times of time an te times of dprofpp ? The `times` manpage may help, as might `getrusage`: http://www.hmug.org/man/3/times.php http://www.hmug.org/man/2/getrusage.php http://publib16.boulder.ibm.com/pseries/en_US/libs/basetrf1/getrusage_64.htm The way that IBM version of the manpage is more oriented towards C programmers using the call, but the basic idea still gets through: This information is read from the calling process as well as from each completed child process for which the calling process executed a wait subroutine. tms_utime The CPU time used for executing instructions in the user space of the calling process tms_stime The CPU time used by the system on behalf of the calling process. tms_cutime The sum of the tms_utime and the tms_cutime values for all the child processes. tms_cstime The sum of the tms_stime and the tms_cstime values for all the child processes. Note: The system measures time by counting clock interrupts. The precision of the values reported by the times subroutine depends on the rate at which the clock interrupts occur. Helpful? -- Chris Devers DO NOT LEAVE IT IS NOT REAL -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: interpolation
Shawn Corey am Montag, 16. Januar 2006 16.55:
John Doe wrote:
The Ghost am Montag, 16. Januar 2006 06.34:
I am storing text stings in a database. when I have the string:
'some perl $variable'
which would print as:
some perl $variable
how can I force interpolation of '$variable'?
one idea I thought of was:
#!/usr/bin/perl
my $var='variable';
$string='some $var';
$string=~s/\$(\w+)/${$1}/gi;
print $string\n;
But it doesn't work. I want it to print some variable.
One way is to change the regex a bit:
#!/usr/bin/perl
use strict;
use warnings;
my $var='variable';
my $other_var='another';
my ($string1, $string2, $string3)=map 'some $var $other_var', 1..3;
# test1, test2, final version:
#
$string1=~s/(\$\w+)/$1/g;
$string2=~s/(\$\w+)/$1/ge;
$string3=~s/(\$\w+)/$1/gee;
print join \n, $string1, $string2, $string3;
greetings
joe
Usually it is considered a bad idea to interpolate external strings. You
could have your users printing any variable. Consider using sprintf
instead (see `perldoc -f sprintf`).
my $format = 'some perl %s';
my $string = sprintf $format, $variable;
print $string\n;
As I understood The Ghost, the starting point string already contains a
literal '$variable': 'some perl $variable'.
I do not know the bigger picture of his problem, but I think an extensible way
to replace a set of known names within a string by values would be (mirco
templating system):
===
#!/usr/bin/perl
use strict;
use warnings;
my %lookup=(
var='variable',
other_var='another',
);
sub err {warn q(Unkown name '), shift, qq(' found\n)}
my $string='some $var $other_var $unknown';
$string=~s
{ \$([a-zA-Z_]+) }
{ exists $lookup{$1} ? $lookup{$1} : do {err($1), ''} }gxe;
print $string;
===
# prints:
Unkown name 'unknown' found
some variable another
No interpolation involved, and the '$' sign preceding the names could be
another one.
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RE: [Win32] Basic I/O Question
--- Timothy Johnson [EMAIL PROTECTED] wrote: The diamond operator works fine without escaping your backslashes, but I recommend putting quotes around your arguments. The following works just fine for me: c:\ while.pl c:\documents and settings\username\desktop\file.txt If you want to use the less-than operator (or a pipe), then you have to explicitly state that you are using perl.exe. cmd.exe can't derive implicitly the program you are invoking via the extension. For example: c:\ perl.exe while.pl ..\myfile.txt Thank you, Timothy. I tested a simple type program on a test file located on c: and another drive and it behaved exactly as you said. I couldn't find any documentation mentioning that adding perl.exe before the program and file name is a necessary condition to get pipes and command-line files to work with STDIN. This seems like it would be an important thing to know for anyone as green as myself. Adam -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: perl-module ParseLex-2.15 install fails on make test
On 1/16/06, Bjørge Solli [EMAIL PROTECTED] wrote: install Parse::Lex t/test1FAILED test 1 Failed 1/1 tests, 0.00% okay I get the same as you do; all tests fail. I recommend contacting the module's author, or using a different module. Cheers! --Tom Phoenix Stonehenge Perl Training -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: Combine multiple lines into one line
Andrej Kastrin: I have the file, which looks like: *RECORD* *ID* 001 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract... Second line of the abstract. [...] Is there any simple way to transform this file to look like: *RECORD* *ID* 001 *TITLE* Here is title number one. *ABSTRACT* First sentence of the abstract. Second sentence of the abstract. Second line of the abstract. $ perl -0pe 's/\n([^*])/ $1/g' infile -- Grtz, Ruud -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
RE: [Win32] Basic I/O Question
(response below) -Original Message- From: Hardly Armchair [mailto:[EMAIL PROTECTED] Sent: Monday, January 16, 2006 3:19 PM To: Timothy Johnson; beginners@perl.org Subject: RE: [Win32] Basic I/O Question snip If you want to use the less-than operator (or a pipe), then you have to explicitly state that you are using perl.exe. cmd.exe can't derive implicitly the program you are invoking via the extension. For example: c:\ perl.exe while.pl ..\myfile.txt Thank you, Timothy. I tested a simple type program on a test file located on c: and another drive and it behaved exactly as you said. I couldn't find any documentation mentioning that adding perl.exe before the program and file name is a necessary condition to get pipes and command-line files to work with STDIN. This seems like it would be an important thing to know for anyone as green as myself. Adam I don't think the documentation exists, or at least I haven't been able to find it. Windows people don't tend to use pipes and redirection as much as their xNIX counterparts, in part because virtually all command-line tools for the Win32 platform that take input from a file allow you to specify the file as a parameter. The best documentation I've found is here: http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs /en-us/redirection.mspx but it doesn't say anything about invoking applications by association. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
