Questions tagged [perl]
Perl is a portable general-purpose dynamic programming language. It is used in a diverse variety of domains: system management scripting, text processing, web content management, Biology calculations, and others. It has a rich library of free reusable modules - the CPAN and a vibrant community of users and developers.
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Choosing between perl and python for my application [closed]
I am working for a small electronics company and I was assigned a task of re-inventing and re-writing the software for our product delivery flow, which gathers design components, verifies them, and ...
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Packaging for distribution: include CI config and other files the end user doesn't need in the package?
(Disclaimers: I have checked on Google and this site. I have read this answer, which is the only related one I could find here. Additionally, that answer is from 2017, and I wonder if things have ...
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1
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Pcregrep vs Perl vs Python for bash scripting when needing advanced regex features [closed]
I've lately been using pcregrep to do Perl-style group matching when doing my bash scripts.
The problem with pcregrep is that it's not readily available on Linux machines in general.
An alternative ...
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7
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When should I use Perl's DBIx::Class?
DBIx::Class is a popular Perl interface to any database that you can connect to through DBI. There is good documentation for its technical details, but scant information about its proper use (...
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How can I handle errors in functions [closed]
I'm programming a web app using Perl and Dancer. The logic is not trivial and I want to separate the web page logic (inside Dancer routes) from the business logic that reads and writes from the ...
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2
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Is the Perl default variable like an FP monad?
I have been getting my head around monads in functional programming and seem to see some commonality between Perl's default variable $_ and FP monads.
Is this true? Are there similarities, if not ...
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2
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Incrementing Strings in PHP (and Perl)
PHP allows you to increment strings. Why?
Let's jump ahead a bit. Take the following code:
$string = '9ZzZ';
echo ++$string; // 10AaA
From a purist point of view this may seem like nonsense, ...
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2
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PHP: when to use arrays, and when to use objects for mostly-data-storing code constructs?
PHP is a mixed paradigm language, allowing to use and return non-object data types, such as arrays. I pose a question to try to clarify some guidelines for selection of arrays vs objects when deciding ...
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1
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2
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Should you ever mix scalar and list contexts anyway?
I have decided to learn Perl as my next language and I am currently reading about the scalar and list contexts, although this question is not specifically Perl-related, I will just put it in a Perl ...
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3
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Is Perl used for web development? [closed]
I am a web developer. I have been using php for many years and I also know lots of other programming languages so I wanted to try making websites using them.
I know Perl and want to make a website ...
3
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1
answer
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What is the origin of the phrase "extirpated as a potential munition"
I recently came across this statement in the Perl documentation:
extirpated as a potential munition
derived from the sentence:
"Creates a digest string exactly like the crypt(3) function in the C ...
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5
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Should Perl scripts really have no extension?
I just began reading O'Reilly's Learning Perl, 6th Edition and was surprised when I came across this excerpt.
#!/usr/bin/perl
print "Hello, world!\n";
Let’s imagine that you’ve typed that into ...
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2
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1
answer
147
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How can I run a script/subroutine on a Web Server and have that subroutine remain private (eg. Key Generator)?
My Problem: I have been tasked with re-implementing a software key generator routine on an external web server running cPanel v.11.44.1.18. Currently, the key generator is implemented using a ...
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1
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In MVC, why can't a model create a view?
I have a web application written in Perl with a controller, some "views" and some "Models". Each "Model" is corresponding to one "View". The controller (one file) creates an Model object ...
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1
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4
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Designs for outputting to a spreadsheet
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 ...
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Explanation java/web (tomcat/coyote/JSP/Servlet etc..) in 'Perl-world' terms
Analyzed one web-server.
for the http request I got: apache 2.2... what redirects to https, and
for https got apache-coyote 1.1.
and the server runs XWiki java app.
Trying to understand how it is ...
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1
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Simple dependency handling for objects (perl)
I am a bit stuck with a design of a project, where many objects has to have access to the same piece of information. It could be some data, to construct a global-like object for themselves or the ...
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1
answer
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What design route should I take?
So I've taken on a project at work that I'm having a hard time attacking, and I'd love some feedback and suggestions.
I work for an online retail store where we have an old, +7k-line script that we ...
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1
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Why Perl is appropriate language for CGI? [closed]
I heard many people around still saying Perl is great language for CGI. But i think it is not as much as popular as now growing languages such as Python, Ruby.
Is there any solid reason for Perl ...
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1
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Building a regex builder [closed]
I am a beginner in programming in general and web development in particular. I am especially bad at regular expressions. Recently I was involved in building a couple of cPanel plugins(Perl-CGI) and ...
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1
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Discovering functionality from parallel class hierarchy
I have an abstract syntax tree which I want to compile down to different representations. I am now struggling to arrange the classes in a way that new representations can be added easily.
The easiest ...
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2
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Languages implemented in Python?
AFAIK, Scala and Clojure are implemented in Java and Java is implemented in C. I suppose that many or most languages are implemented in C, for instance Perl, Python and SQL. I don't know much about ...
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Checking for cross-site scripting vulnerabilities in Perl web applications
I'm putting together some notes for a dev team on how to write secure Perl code - especially taking into account the current OWASP top 10 web application vulnerabilities. For cross-site scripting I've ...
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2
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Is Perl outdated for CGI and FCGI? [closed]
When we did web development in 1996 it was CGI, FCGI and Perl on the backend. Now why is Perl not that popular anymore and instead we use Java, Python, Go, PHP, C# and everything but Perl? To me it ...
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2
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C Equivalent of Perl Unpack & Pack
I have some perl code that uses pack and unpack to transform the data in a way that I don't understand.
$unpacked_data = pack('b*', join('', unpack('(b7)*', $packed_data)))
Where $packed_data = a ...
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3
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Perform operations in the entry-script, or create a class which just instantiates and calls methods?
I'm building a perl application which does the following operations:
Copy a bunch of files (class fileFetcher )
Parse each file (class fileParser)
Store some data from each file in a database (class ...
9
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4
answers
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Programming style in Perl
I work in Java so basically I use OOP paradigm during coding.
I am about to start working in Perl and I was wondering what is the paradigm that Perl developers follow.
In wiki it mentions that it ...
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1
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Task Scheduler shared hosting
I am using a shared host that which doesn't support CRON/TaskScheduler (it is a windows Godaddy server).
I need to search on email server for new emails on each 1 hour, I have the script on PHP.
Can ...
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Is Non-Deterministic Resource-Management a Leaky Abstraction?
From what I can see, there are two pervasive forms of resource-management: deterministic destruction and explicit. Examples of the former would be C++ destructors and smart pointers or Perl's DESTROY ...
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is it possible to monitor more than one stream simultanously?
E.g.
- $stream1 is the STDOUT of a child process and $stream2 is the STDERR of the same child process
- $stream1 is one child process and $stream2 is another child process
Is there a possiblility in ...
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2
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Is it better to use $filehandler or FILEHANDLER?
It seems like FILEHANDLER is more commonly used as a handler naming convention than $filehandler.
But it can give a bareword error if one forgets to use *FILEHANDLER in some constructions.
What are ...
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3
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How does the GPL static vs. dynamic linking rule apply to interpreted languages?
In my understanding, the GPL prohibits static linking from non-GPL code to GPL code, but permits dynamic linking from non-GPL code to GPL code. So which is it when the code in question is not linked ...
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3
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conventions for friend methods in Perl
Perl doesn't support a friend relationship between objects, nor does it support private or protected methods. What is usually done for private methods is to prefix the name with an underscore. I ...
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What is a "template" in Perl?
I can find all sorts of weird information about templates in Perl, but nothing about what they actually are.
Are they generic types like in C++? Is it a class-like structure? Or maybe something ...
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Converting data-structure in Perl [closed]
A function produces this hash of arrays:
'KEYNAME1' => ARRAY(0x1edeeb0)
0 'val11'
1 'val12'
2 'val13'
'KEYNAME2' => ARRAY(0x1efacb8)
0 'val21'
1 'val22'
2 'val23'
...
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2
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Arrow => in Perl
What does the => mean in Perl?
my $CreateArray = [
objectClass => [ "top", "person", "organizationalPerson", "inetOrgPerson" ],
cn => "Jane User",
uid => "0000001",
sn => "User",
mail =...
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1
answer
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UML representation of specific factory pattern
I have to create an UML class diagram from the following example code (Perl). I don't think that the standard factory pattern match in my case or I don't understand it correctly. I don't have ...
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4
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Is it bad to learn multiple programming languages? [closed]
I started learning PHP and I was able to get myself familiar with it. Now, I want to explore other programming languages like PERL so that I can compare it myself to PHP. Will I be confused to learn ...
- 151
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3
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Scripting language for filling out web form
I have a job as an intern at a technology company, I was given the unfortunate job of performing some data entry into our web management system. The information entered into the web form is stored in ...
- 169
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votes
5
answers
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Improving performance for grepping over a huge file
I have FILE_A which has over 300,000 lines and FILE_B which has over 30 million lines. I created a Bash script that greps each line in FILE_A over in FILE_B and writes the result of the grep to a new ...
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Queuing RPC calls
I'm designing a system which listens to JSON RPC calls from clients, piles them up inside a list, and if the list gets full it will store them in a DB and keep receiving calls.
My original plan is to ...
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Alternative to Perl's POD Documentation in Other Languages?
Perl has this really cool documentation method that makes documenting really easy. It's called POD (Plain Old Documentation). Here is an example:
=head1 NAME
Example::Module - an example
=head1 ...
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1
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What conventions or frameworks exist for MVVM in Perl?
We're using Catalyst to render lots of webforms in what will become a large application. I don't like the way all the form data is confusingly into a big hash in the Controller, before being passed to ...
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3
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What are the similarities between Perl and Java? [closed]
I have my mind set that I'm learning Java as my second language (I am a Perl developer). But just from reading a little of the online tutorials, I really can't find any similarities between the two. ...
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12
answers
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How to write a command interpreter/parser?
Problem: Run commands in the form of a string.
command example:
/user/files/ list all;
equivalent to:
/user/files/ ls -la;
another one:
post tw fb "HOW DO YOU STOP THE TICKLE MONSTER?;"
equivalent ...
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12
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As a young developer, should I be worried about having to use "out-of-style" tech at work? [closed]
I'm a recent college graduate (last May!). While I was still in school, I wanted to make sure that I had a job before I graduated, and very early (probably too early) in my job search I settled on one ...
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2
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Why is Perl 5's smart-match operator considered broken? [closed]
I've seen a number of comments across the web Perl's smart-match operator is broken.
I know it originally was part of Perl 6, then was implemented in Perl 5.10 off of an old version of the spec, and ...
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5
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increasing productivity - mastering a language vs. selecting efficient tools
I'm looking for advice from experienced developers on this question.
In my work there's a need for a lot of one-off code. It's tempting to just dip into the right python/perl library calls to do ...
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19
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Is Perl still a useful, viable language? [closed]
I know it may have been asked before, but here goes nothing...
Is Perl still something that would be considered useful? If someone was a new programmer (either completely new to programming or just a ...
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3
answers
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What does a company typically expect from a Perl developer? [closed]
Are there any common expectations from perspective employers when they hire a Perl developer?
For a student who likes Perl and Linux and would like to get a job as Perl developer, what would you ...
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