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  • Perl on MacOS X 10.6.2: GDBM_File missing, how to install or work around?

    - by jdmuys
    When I need a Perl module, I typically use CPAN. It works fine. But not this time. I want to use MARC::Charset, but this one uses GDBM_File, and I can't seem to install GDBM_File from CPAN. CPAN finds it all right, but trying to install it, it starts installing the full Perl 5.10.1 distribution. MARC::Charset is a rather old module, so there should be a way to use it from some common Perl version (Mac OS X 10.6.2 has 5.10.0 and 5.8.9 by default). While installing the full blow Perl 5.10.1 is not an option, modifying MARC::Charset to stop using GDBM_File might be one. What would be the best course of action to do so? This last option might also be the only one. googling GDBM_File uncovers a few items that suggest that gdbm is not even available on the Mac. Those items typically went over my head though. While I don't expect a silver bullet, somebody may have a pointer or two on where I should start. After all, MARC::Charset only does character transliteration to/from the marc8 char set, which unfortunately, iconv doesn't seem to support.

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  • Nested dereferencing arrows in Perl: to omit or not to omit?

    - by DVK
    In Perl, when you have a nested data structure, it is permissible to omit de-referencing arrows to 2d and more level of nesting. In other words, the following two syntaxes are identical: my $hash_ref = { 1 => [ 11, 12, 13 ], 3 => [31, 32] }; my $elem1 = $hash_ref->{1}->[1]; my $elem2 = $hash_ref->{1}[1]; # exactly the same as above Now, my question is, is there a good reason to choose one style over the other? It seems to be a popular bone of stylistic contention (Just on SO, I accidentally bumped into this and this in the space of 5 minutes). So far, none of the usual suspects says anything definitive: perldoc merely says "you are free to omit the pointer dereferencing arrow". Conway's "Perl Best Practices" says "whenever possible, dereference with arrows", but it appears to only apply to the context of dereferencing the main reference, not optional arrows on 2d level of nested data structures. "MAstering Perl for Bioinfirmatics" author James Tisdall doesn't give very solid preference either: "The sharp-witted reader may have noticed that we seem to be omitting arrow operators between array subscripts. (After all, these are anonymous arrays of anonymous arrays of anonymous arrays, etc., so shouldn't they be written [$array-[$i]-[$j]-[$k]?) Perl allows this; only the arrow operator between the variable name and the first array subscript is required. It make things easier on the eyes and helps avoid carpal tunnel syndrome. On the other hand, you may prefer to keep the dereferencing arrows in place, to make it clear you are dealing with references. Your choice." Personally, i'm on the side of "always put arrows in, since itg's more readable and obvious tiy're dealing with a reference".

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  • Why does my Perl CGI script cause a 500 internal server error?

    - by Nitish
    I get a 500 internal server error when I try to run the code below in a web server which supports perl: #! /usr/bin/perl use LWP; my $ua = LWP::UserAgent->new; $ua->agent("TestApp/0.1 "); $ua->env_proxy(); my $req = HTTP::Request->new(POST => 'http://www.google.com/loc/json'); $req->content_type('application/jsonrequest'); $req->content('{ "cell_towers": [{"location_area_code": "55000", "mobile_network_code": "95", "cell_id": "20491", "mobile_country_code": "404"}], "version": "1.1.0", "request_address": "true"}'); my $res = $ua->request($req); if ($res->is_success) { print $res->content,"\n"; } else { print $res->status_line, "\n"; return undef; } But there is no error when I run the code below: #! /usr/bin/perl use CGI::Carp qw(fatalsToBrowser); print "Content-type: text/html\n\n"; print "<HTML>\n"; print "<HEAD><TITLE>Hello World!</TITLE></HEAD>\n"; print "<BODY>\n"; print "<H2>Hello World!</H2> <br /> \n"; foreach $key (sort keys(%ENV)) { print "$key = $ENV{$key}<p>" ; } print "</BODY>\n"; print "</HTML>\n"; So I think there is some problem with my code. When I run the first perl script in my local machine with the -wc command, it says that the syntax is OK. Help me please.

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  • How do I export a package symbol to a namespace in Perl?

    - by Mike
    I'm having trouble understanding how to export a package symbol to a namespace. I've followed the documentation almost identically, but it seems to not know about any of the exporting symbols. mod.pm #!/usr/bin/perl package mod; use strict; use warnings; require Exporter; @ISA = qw(Exporter); @EXPORT=qw($a); our $a=(1); 1; test.pl $ cat test.pl #!/usr/bin/perl use mod; print($a); This is the result of running it $ ./test.pl Global symbol "@ISA" requires explicit package name at mod.pm line 10. Global symbol "@EXPORT" requires explicit package name at mod.pm line 11. Compilation failed in require at ./test.pl line 3. BEGIN failed--compilation aborted at ./test.pl line 3. $ perl -version This is perl, v5.8.4 built for sun4-solaris-64int

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  • Perl 500 internal server error. Something wrong with my code.

    - by Nitish
    I get a 500 internal server error when I try to run the code below in a web server which supports perl: #! /usr/bin/perl use LWP; my $ua = LWP::UserAgent->new; $ua->agent("TestApp/0.1 "); $ua->env_proxy(); my $req = HTTP::Request->new(POST => 'http://www.google.com/loc/json'); $req->content_type('application/jsonrequest'); $req->content('{ "cell_towers": [{"location_area_code": "55000", "mobile_network_code": "95", "cell_id": "20491", "mobile_country_code": "404"}], "version": "1.1.0", "request_address": "true"}'); my $res = $ua->request($req); if ($res->is_success) { print $res->content,"\n"; } else { print $res->status_line, "\n"; return undef; } But there is no error when I run the code below: #! /usr/bin/perl use CGI::Carp qw(fatalsToBrowser); print "Content-type: text/html\n\n"; print "<HTML>\n"; print "<HEAD><TITLE>Hello World!</TITLE></HEAD>\n"; print "<BODY>\n"; print "<H2>Hello World!</H2> <br /> \n"; foreach $key (sort keys(%ENV)) { print "$key = $ENV{$key}<p>" ; } print "</BODY>\n"; print "</HTML>\n"; So I think there is some problem with my code. When I run the first perl script in my local machine with the -wc command, it says that the syntax is OK. Help me please.

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  • Hopping from a C++ to a Perl Unix profile?

    - by rocknroll
    Hi all, I have been a C++,Linux Developer till now and I am adept in this stack. Off late I have been getting opportunities that require Perl,Unix (with knowledge of C++,shell scripting) expertise. Organisations are showing interest even thought I don't have much scripting experience to boast off. The roll is more in a Support,maintenance project involving SQL as well. Off late I am in a fix whether to forgo these offers or not. I don't know the dynamics of an IT organisation and thus on one hand I fear that my C++ experience will be nullified and on the positive side I am getting to work on a new technology stack which will only add to my skill set. I am sure, most of you at some point of time have encountered such dilemmas and would have taken some decision. I want you to share your perspectives on such a scenario where a person is required to change his/her technology stack when changing his/her job. What are the merits and demerits in going with either of the choices? Also I know that C++ isn't going anywhere in the near future. What about perl? I have no clue as to what the future holds for perl developer? Whether there are enough opportunities for a perl developer? I am asking this question here because most of my fellow programmers face this career choice dilemma. Thanks.

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  • Why does Perl lose foreign characters on Windows; can this be fixed (if so, how)?

    - by Alex R
    Note below how ã changes to a. NOTE2: Before you blame this on CMD.EXE and Windows pipe weirdness, see Experiment 2 below which gets a similar problem using File::Find. The particular problem I'm trying to fix involves working with image files stored on a local drive, and manipulating the file names which may contain foreign characters. The two experiments shown below are intermediate debugging steps. The ã character is common in latin languages. e.g. http://pt.wikipedia.org/wiki/Cão Experiment 1 Experiment 2 To get around my particular problem, I tried using File::Find instead of piped input. The issue actually gets worse: Debugging update: I tried some of the tricks listed at http://perldoc.perl.org/perlunicode.html, e.g. use utf8, use feature 'unicode_strings', etc, to no avail. Environment and Version Info The OS is Windows 7, 64-bit. The Perl is: This is perl 5, version 12, subversion 2 (v5.12.2) built for MSWin32-x64-multi-thread (with 8 registered patches, see perl -V for more detail) Copyright 1987-2010, Larry Wall Binary build 1202 [293621] provided by ActiveState http://www.ActiveState.com Built Sep 6 2010 22:53:42

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  • Delete Perl install files?

    - by Bjorn
    I have a VPS that is managed and am mysteriously running out of space, I think I found a few files I can delete. So just double checking it's ok to delete the Perl install files: /root/perl588installer.tar.gz (pretty sure this can go) /root/perl588installer/ (wasn't sure if this can go, I'm thinking it's just used when perl is installed) I rarely install this kind of thing myself but when I do I'm sure you can delete these files. Thanks

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  • Perl moderne - L'essentiel des pratiques actuelles, une critique de djibril

    Ce Guide de survie est l'outil indispensable pour programmer en Perl aujourd'hui. Il présente les dernières évolutions de Perl 5 par ses versions 5.10 et 5.12, fortement empreintes de la version 6 en cours de finalisation. CONCIS ET MANIABLE : Facile à transporter, facile à utiliser - finis les livres encombrants ! PRATIQUE ET FONCTIONNEL : Plus de 350 séquences de code pour répondre aux situations les plus courantes et exploiter efficacement les fonctions et les bibliothèques d'un langage qui s'est radicalement modernisé.

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  • Why is Perl Cgiwrap Sock refusing connection to nginx?

    - by Emmanuel
    Could anyone shed some light on the following line in my nginx error logs. I'm trying to get Perl and Nginx talking to each other, but so far no success. unix:/var/run/nginx/cgiwrap-dispatch.sock failed (111: Connection refused)2011/11/20 09:18:34 [error] 24054#0: *1186 connect() to unix:/var/run/nginx/cgiwrap-dispatch.sock failed (111: Connection refused) while connecting to upstream, client: 150.101.221.75, server: example.com, request: "GET /dspam.cgi HTTP/1.1", upstream: "fastcgi://unix:/var/run/nginx/cgiwrap-dispatch.sock:", host: "example.com" The relevant nginx configs. location ~ \.cgi$ { gzip off; include /etc/nginx/fastcgi_params; fastcgi_pass unix:/var/run/fcgiwrap.socket; fastcgi_index index.pl; fastcgi_param SCRIPT_FILENAME /var/www/dspam$fastcgi_script_name; }

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  • Apache returns the perl script source instead of execute the script when the request comes from chrome

    - by Kartoch
    I've just finish to install awstats on my web server, and it runs fine using firefox. But when I try to open the awstats page with chrome, the perl source script is downloaded (instead of being executed). it seems the MIME requested by Chrome gave a different behavior compared to Chrome. Any idea ? Interesting part of the Apache configuration file: <Directory "/var/www/cryptis-https-root/admin-awstats"> Options Indexes FollowSymLinks MultiViews ExecCGI AllowOverride None Order allow,deny Allow from X.Y </Directory> Alias /awstatsclasses "/var/www/awstats/wwwroot/classes/" Alias /awstatscss "/var/www/awstats/wwwroot/css/" Alias /awstatsicons "/var/www/awstats/wwwroot/icon/" ScriptAlias /admin-awstats/ "/var/www/awstats/wwwroot/cgi-bin/" <Directory "/var/www/awstats/wwwroot"> Options None ExecCGI AllowOverride None Order allow,deny Allow from X.Y </Directory> I've tried to add the following line in the apache configuration file but it has no effect: AddHandler cgi-script .pl

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  • Set top level directory to be handled by Perl?

    - by Sam Lee
    I have an Apache server set up to use mod_perl. I have it set up to handle all requests using a Perl module MyModule. Here is part of my httpd.conf: LoadModule perl_module modules/mod_perl.so <Directory /> Order Deny,Allow Allow from all </Directory> PerlModule MyModule <Location /> SetHandler modperl PerlResponseHandler MyModule </Location> This seems to work fine, except top level directory (ie. www.mysite.com/) is not being sent to MyModule. What's going wrong?

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  • Silent and scripted install of CPAN and Perl modules?

    - by Mikael Grönfelt
    I need to install CPAN and some Perl modules automatically in a Scientific Linux (RHEL) installation script. Unfortunately the specific modules I want (at least one of them) cannot be found as RPM:s as far as I've seen. So I need to install CPAN, configure it automatically (or with a config file) and then install the wanted modules (including dependencies) automatically as well. This doesn't seem like a very unusual requirement, but I haven't seen any really good documentation on this. The problem is that whenever CPAN is launched for the first time an interactive configuration runs. Can this be skipped somehow? And how do I launch module installations directly from the command line?

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  • Why can't my Perl script in ~/bin find relative file paths?

    - by sid_com
    #!/usr/bin/env perl use warnings; use strict; use XML::LibXML; my $parser = XML::LibXML->new; my $file = './example.xml'; my $doc = $parser->parse_file( $file ); print ref( $doc ), "\n"; When I move this script and the example.xml-file to /home/me/ then the script works. When I move the script and the example.xml-file to /home/me/bin/ then the script doesn't find the example.xml-file. Is this some special-feature of the bin-directory?

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  • How can I convert Perl one-liners into complete scripts?

    - by Stefan Lasiewski
    I find a lot of Perl one-liners online. Sometimes I want to convert these one-liners into a script, because otherwise I'll forget the syntax of the one-liner. For example, I'm using the following command (from nagios.com): tail -f /var/log/nagios/nagios.log | perl -pe 's/(\d+)/localtime($1)/e' I'd to replace it with something like this: tail -f /var/log/nagios/nagios.log | ~/bin/nagiostime.pl However, I can't figure out the best way to quickly throw this stuff into a script. Does anyone have a quick way to throw these one-liners into a Bash or Perl script?

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  • How do I get code coverage of Perl cgi script when executed by Selenium?

    - by Kurt W. Leucht
    I'm using Eclipse EPIC IDE to write some Perl cgi scripts which call some Perl modules that I have also written. The EPIC IDE lets me configure a Perl CGI "run configuration" which runs my CGI script. And then I've got Selenium set up and one of my unit test files runs some Selenium commands to run my cgi script through its paces. But the coverage report from Module::Build dispatch 'testcover' doesn't show that any of my module code has been executed. It's been executed by my cgi script, but I guess the CGI script was run manually and was not executed directly by my unit test file, so maybe that's why the coverage isn't being recognized. Is there a way to do this right so I can integrate Selenium and unit test files and code coverage all together somehow?

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  • If I already know Perl Is Python worth learning?

    - by Garett
    I'm all for learning and continual improving one’s self, and I believe you should have as many tools as possible in your toolbox. However, I was wondering if it was worth it learning Python, since I already know a couple of dynamic interpreted languages, including Perl. My background is mostly C/C++/Java/C#, but I’ve programmed in Perl quite a bit over the years. I recently read Dive Into Python, as well as the tutorial for the Django framework for a new project where Python was suggested. However, I kept finding myself thinking that I can still accomplish much of the same stuff with Perl, so I’m not sure when I would choose a Python approach over one that I’m already familiar with. This is by no means meant to start any kind of language war, and I do recognize that language choice is quite subjective. I just wondering when one would make such a choice.

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  • How can I convert Perl regular expressions to boost regular expressions?

    - by YY
    I'm not familiar with Perl and boost regular expression and I want to convert a Perl code to c++. I want to convert special regular expression in Perl into c++ using Boost regexp library. Please help me understand what I must do? Here is some regexps that a word of a sentence may match: if ($word =~ /^[\.:\,()\'\`-]/) { # hack for punctuation } if ($word =~ /^[A-Z]/) { return; } if ($word =~ /[A-Za-z0-9]+\-[A-Za-z0-9]+/) { # all hyphenated words return; } if ($word =~ /.*[0-9].*/) { # all numbers return; }

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  • How can I extract and save values from an XML file in Perl?

    - by Freddy
    Here is what I am trying to do in a Perl script: $data=""; sub loadXMLConfig() { $filename="somexml.xml" $data = $xml-XMLin($filename); } sub GetVariable() { ($FriendlyName) = @_; switch($FriendlyName) { case "My Friendly Name" {print $data-{my_xml_tag_name}} .... .... .... } } The problem is I am using Perl just because I am reading from an XML file, but I need to get these variables by a shell script. So, here is what I am using: $ perl -e 'require "scrpt.pl"; loadConfigFile(); GetVariable("My Variable")' This works exactly as expected, but I need to read the XML file every time I am getting a variable. Is there a way I could "preserve" $data across shell calls? The idea is that I read the XML file only once. If no, is there is a more simple way I could do this? These are the things I can't change: Config File is an XML Need the variables in a shell script

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  • How can I obfuscate my Perl script to make it difficult to reverse engineer?

    - by codaddict
    I've developed a Perl script that the a confidential business logic. I have to give this script to another Perl coder to test it in his environment. He will definitely try to extract the logic in my program. So I want to make my script impossible, or at least very very hard, to understand. I've tried a few sites like liraz, but they did not work for me. The encoded Perl script does not work the same as the original one.

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  • How can I deploy a Perl/Python/Ruby script without installing an interpreter?

    - by Brian G
    I want to write a piece of software which is essentially a regex data scrubber. I am going to take a contact list in CSV and remove all non-word characters and such from the person's name. This project has Perl written all over it but my client base is largely non-technical and installing Perl on Windows would not be worth it for them. Any ideas on how I can use a Perl/Python/Ruby type language without all the headaches of getting the interpreter on their computer? Thought about web for a second but it would not work for business reasons.

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  • What is Perl doing with this argument to push in this case?

    - by Morinar
    I just saw some code in our code base (and it's OLD code, as in Perl 3 or Perl 4 days) that looks like this (I'm simplifying greatly): my @array; push( array, $some_scalar ); Notice that the array in the push() doesn't have an @. I would assume that the code behind push knows that the first argument is supposed to be array so grabs the array from the array typeglob. Is that more or less it? If Perl is able to do that without problem, why would you need to include the @ at all?

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  • How can I get Perl to detect the bad UTF-8 sequences?

    - by gorilla
    I'm running Perl 5.10.0 and Postgres 8.4.3, and strings into a database, which is behind a DBIx::Class. These strings should be in UTF-8, and therefore my database is running in UTF-8. Unfortunatly some of these strings are bad, containing malformed UTF-8, so when I run it I'm getting an exception DBI Exception: DBD::Pg::st execute failed: ERROR: invalid byte sequence for encoding "UTF8": 0xb5 I thought that I could simply ignore the invalid ones, and worry about the malformed UTF-8 later, so using this code, it should flag and ignore the bad titles. if(not utf8::valid($title)){ $title="Invalid UTF-8"; } $data->title($title); $data->update(); However Perl seems to think that the strings are valid, but it still throws the exceptions. How can I get Perl to detect the bad UTF-8?

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