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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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  • How do I use google API within perl CGI script?

    - by stephenmm
    The google API example shows that you should have the javascript within the head tag but I am using perl module CGI and in there they suggest that you use "print header;" instead of writting out your headers explicitly. So if I want to use the perl CGI module and the google API javascript what is the correct way to do this? I tried writing out the header explicitly but It seemed like the perl module really wanted me to use the header method. It seems like this would be a common use case but I looked around the web for some examples of this and I could not find one. Any help would be appreciated.

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  • What is the recommended way to package perl scripts for CPAN (and CorporatePAN)?

    - by szabgab
    Recently I looked at a module on CPAN that comes with a script to be installed which made me wonder. What is the recommended way to include a script in a package that should end up on the public CPAN and if there is any different recommendation for packages that would be released on an in-house CPAN server? The script starts like this: #!/usr/bin/perl eval 'exec /usr/bin/perl -S $0 ${1+"$@"}' if 0; # not running under some shell Two questions Do I understand correctly the eval part is unnecessary? That will be embedded by the CPAN client during installation and it will be very different when installing on Windows. What is the recommended sh-bang line? Would that be #!/usr/bin/env perl instead of the above?

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  • Origin of discouraged perl idioms: &x(...) and sub x($$) { ... }

    - by knorv
    In my perl code I've previously used the following two styles of writing which I've later found are being discouraged in modern perl: # Style #1: Using & before calling a user-defined subroutine &name_of_subroutine($something, $something_else); # Style #2: Using ($$) to show the number of arguments in a user-defined sub sub name_of_subroutine($$) { # the body of a subroutine taking two arguments. } Since learning that those styles are not recommended I've simply stopped using them. However, out of curiosity I'd like to know the following: What is the origin of those two styles of writing? (I'm sure I've not dreamt up the styles myself.) Why are those two styles of writing discouraged in modern perl? Have the styles been considered best practice at some point in time?

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  • Installing Munin on Centos 6

    - by justinhj
    I've hit problems installing munin on Centos 6. This seems to be a conflict between parts of Perl. I think the version of Perl is newer on Centos 6 (v5.10.1) When installing munin via yum I get errors relating to perl dependencies as below. I'm not a big enough whiz at yum or rpm to figure out the issue. Munin documentation does not yet talk about installing to Centos 6.0 Error: Package: munin-node-1.4.2-0.rpl1.el5.noarch (/munin-node-1.4.2-0.rpl1.el5.noarch) Requires: perl(Net::SNMP) Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: bitstream-vera-fonts Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl(HTML::Template) Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl-Net-SNMP Error: Package: munin-common-1.4.2-0.rpl1.el5.noarch (/munin-common-1.4.2-0.rpl1.el5.noarch) Requires: perl(:MODULE_COMPAT_5.8.8) Error: Package: munin-node-1.4.2-0.rpl1.el5.noarch (/munin-node-1.4.2-0.rpl1.el5.noarch) Requires: perl(DBI) Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl(Log::Log4perl) Error: Package: munin-node-1.4.2-0.rpl1.el5.noarch (/munin-node-1.4.2-0.rpl1.el5.noarch) Requires: perl(LWP::Simple) Error: Package: munin-node-1.4.2-0.rpl1.el5.noarch (/munin-node-1.4.2-0.rpl1.el5.noarch) Requires: perl(:MODULE_COMPAT_5.8.8) Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl(RRDs) Error: Package: munin-node-1.4.2-0.rpl1.el5.noarch (/munin-node-1.4.2-0.rpl1.el5.noarch) Requires: perl-Net-Server Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl(Date::Manip) Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl(:MODULE_COMPAT_5.8.8) Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl-Net-Server Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl(CGI::Fast) Error: Package: munin-1.4.2-0.rpl1.el5.noarch (/munin-1.4.2-0.rpl1.el5.noarch) Requires: perl(Time::HiRes)

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  • Perl script rendered in browser as code through symlink - fine when accessed directly

    - by John Dittmar
    I have a Rails 4 app that has some views that post to Perl cgi scripts. The perl scripts are accessed via a symbolic link to a folder called "cgi-bin". When I navigate to a perl script through the symbolic link they are rendered as text instead of executed (ie: localhost:3000/cgi-bin/test.cgi), however when I access them directly they execute without issue (ie. localhost/path/to/cgi-bin/test.cgi). I am using apache2 on os x. In the directory localhost/path/to/ I have an .htaccess file that contains the following: # General Apache options AddHandler fastcgi-script .fcgi AddHandler cgi-script .cgi Options +FollowSymLinks +ExecCGI I have the exact same lines in the .htaccess file that I have in localhost:3000/ I have also uncommented the AllowOverride all in httpd.conf. The are no errors in apache's error log. When I access the direct link to test.cgi a new line is appended to apache's access log, when I access the script through the symbolic link (and it is rendered as text), there is no line appended to the access log. Any idea why this error occurs? This setup worked fine in a previous version of rails of OS X, but recently I upgraded to Mavericks and figured I should update the Rails application to v4.0 as well.

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  • Designs for outputting to a spreadsheet

    - by Austin Moore
    I'm working on a project where we are tasked to gather and output various data to a spreadsheet. We are having tons of problems with the file that holds the code to write the spreadsheet. The cell that the data belongs to is hardcoded, so anytime you need to add anything to the middle of the spreadsheet, you have to increment the location for all the fields after that in the code. There are random blank rows, to add padding between sections, and subsections within the sections, so there's no real pattern that we can replicate. Essentially, anytime we have to add or change anything to the spreadsheet it requires a many long and tedious hours. The code is all in this one large file, hacked together overtime in Perl. I've come up with a few OO solutions, but I'm not too familiar with OO programming in Perl and all my attempts at it haven't been great, so I've shied away from it so far. I've suggested we handle this section of the program with a more OO friendly language, but we can't apparently. I've also suggested that we scrap the entire spreadsheet idea, and just move to a webpage, but we can't do that either. We've been working on this project for a few months, and every time we have to change that file, we all dread it. I'm thinking it's time to start some refactoring. However, I don't even know what could make this file easier to work with. The way the output is formatted makes it so that it has to be somewhat hardcoded. I'm wondering if anyone has insight on any design patterns or techniques they have used to tackle a similar problem. I'm open to any ideas. Perl specific answers are welcome, but I am also interested in language-agnostic solutions.

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  • What is an effective way to familiarize yourself with a new application in a new language? [closed]

    - by codeninja
    Possible Duplicate: How do I pick up a new language quickly, given I know several others? I started a new job working on an application I'm vaguely familar with, and it's in PERL! I come from a PHP and Java background, so while I understand the basics, there are lot of nuances in PERL that make it troublesome. updated < Im supposed to be a UI developer, but the smallness of the office requires me to learn and do a lot more than just javascript. So that was slightly unexpected in some aspects and I'm just thinking about what approach to take with this /updated So far I've been sifting through the code to understand what each part does, printed out copies of code and try to lookup APIs I'm not familiar with, and so I dunno how effective this process is -- I feel like it's gonna take some time -- and I dont want my new employers to feel like I'm not being productive. Anyone have some ideas or approaches for this kind of situation? I read some of the questions about learning new languages, but I'm curious to see if anyone's had experience with this with PERL.

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  • Is there any performance comparison between Perl web frameworks?

    - by DVK
    I have seen mentions (which sounded like unsubstantiated opinions, and dated ones at that) that Embperl is the fastest Perl web framework. I was wondering if there's a consensus on the relative speed of the major stable Perl web frameworks, or ideally, some sort of fact-based performance comparisons between implementations of the same sample webapps, or individual functionalities (e.g. session handling or form data processing), etc...?

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  • How can I get a call stack listing in Perl?

    - by slashmais
    Is there a way I can access (for printout) a list of sub + module to arbitrary depth of sub-calls preceding a current position in a Perl script? I need to make changes to some Perl modules (.pm's). The workflow is initiated from a web-page thru a cgi-script, passing input through several modules/objects ending in the module where I need to use the data. Somewhere along the line the data got changed and I need to find out where.

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  • Why can't the w3c validator find the Perl's SGML::Parser::OpenSP?

    - by coure06
    I have installed W3C validator locally on Windows, following their instructions. I am getting this error while validating a site: Can't locate loadable object for module SGML::Parser::OpenSP in @INC (@INC contains: C:/www/perl/site/lib C:/www/perl/lib .) at C:/www/validator/httpd/cgi-bin/check line 60 Compilation failed in require at C:/www/validator/httpd/cgi-bin/check line 60. BEGIN failed--compilation aborted at C:/www/validator/httpd/cgi-bin/check line 60. I am using SGML::Parser::OpenSP 0.991 module.

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  • How can I use Perl's s/// in an expression?

    - by mikeY
    I got a headache looking for this: How do you use s/// in an expression as opposed to an assignment. To clarify what I mean, I'm looking for a perl equivalent of python's re.sub(...) when used in the following context: newstring = re.sub('ab', 'cd', oldstring) The only way I know how to do this in perl so far is: $oldstring =~ s/ab/cd/; $newstring = $oldstring; Note the extra assignment.

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  • Is there something like "New Relic" for Perl apps?

    - by Cninroh
    We have successfully migrated all of our PHP and Ruby apps to use New Relic RPM both for Application performance measurements and server monitoring. We are very please with results, which have enabled us to improve the overall performance of the platfrom numeral times. We still have a lot of Perl applications which we need to support for legacy purposes, but in comparison to our New Relic powred apps we are completely blind to whats happening inside the apps and in peak hours. Is there something like "New Relic" for Perl apps?

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  • What is the difference between using $1 vs \1 in Perl regex substitutions?

    - by Mr Foo Bar
    I'm debugging some code and wondered if there is any practical difference between $1 and \1 in Perl regex substitutions For example: my $package_name = "Some::Package::ButNotThis"; $package_name =~ s{^(\w+::\w+)}{$1}; print $package_name; # Some::Package This following line seems functionally equivalent: $package_name =~ s{^(\w+::w+)}{\1}; Are there subtle differences between these two statements? Do they behave differently in different versions of Perl?

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  • How to execute a perl script within php and capture error messages?

    - by Marcel Tjandraatmadja
    I am trying to execute a Perl script like so: /usr/bin/ec2-consistent-snapshot 'vol-dr3131c2' When the Perl script fails it exits using 'die' and prints out an error message. I can see that error message when executing manually, but I am failing to capture it through PHP. I tried the following with no success: exec($command,$output); echo system($command,$output); passthru($command); Any ideas?

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