O'Reilly Answers

Topics: Perl

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  How do I know if my Perl script is running interactively?

  

  By brian_d_foy

  taken from perlfaq8 This is a difficult question to answer, and the best answer is only a guess. What do you really want to know? If you merely want to know if one of your filehandles is connected to...

  05 November 2009 - 09:23 AM | 0 Comments
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  • perl

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  How can you convert MIME email files into Outlook on Linux

  Asked by sanichi

  04 November 2009 - 01:24 PM
  Tags:

  • MIME
  • Linux
  • Perl
  • Outlook

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  Performance of $& vs $1 in a Perl substitution

  

  By brian_d_foy

  Here's a benchmark with Perl 5.010. Note that 5.010 has a new /p flag that supplies a ${^MATCH} variable that acts like $& but for only one instance of the match or substitution oper...

  04 November 2009 - 08:02 AM | 0 Comments
  Tags:

  • perl
  • substitution
  • benchmark

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  How to remove duplicate lines with regular expressions

  

  By StevenLevithan

  There is a variety of software (including the Unix command-line utility uniq and Windows PowerShell cmdlet Get-Unique) that can help you remove duplicate lines in a file or ...

  30 October 2009 - 08:35 AM | 0 Comments
  Tags:

  • duplicates
  • regex
  • regular expression
  • .NET
  • java
  • javascript
  • PCRE
  • perl
  • python
  • ruby
  • php

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  Convert Binary, Octal, and Hexidecimal Numbers in Perl

  

  By gnat

  Perl understands numbers specified in binary (base-2), octal (base-8), and hexadecimal (base-16) notation only when they occur as literals in your programs. If they come in as data—such as by readin...

  20 October 2009 - 05:10 PM | 0 Comments
  Tags:

  • binary
  • octal
  • hexidecimal
  • convert
  • perl

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  How to Multiply Matrices in Perl

  

  By gnat

  If you want to multiply a pair of two-dimensional arrays, use the PDL modules, available from CPAN. PDL is the Perl Data Language—modules that give fast access to compact matrix and mathematical fun...

  20 October 2009 - 04:53 PM | 0 Comments
  Tags:

  • perl
  • multiplication
  • matrices

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  How to Generate Random Numbers in Perl

  

  By gnat

  If you want to make random numbers in a given range, inclusive, such as when you randomly pick an array index, simulate rolling a die in a game of chance, or generate a random password, use Perl's...

  20 October 2009 - 04:01 PM | 0 Comments
  Tags:

  • rand
  • random numbers
  • perl
  • numbers

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  How to Round Floating-Point Numbers in Perl

  

  By gnat

  If you want to round a floating-point value to a certain number of decimal places, use the Perl function sprintf, or printf if you're just trying to produce output: # round off to ...

  20 October 2009 - 03:40 PM | 0 Comments
  Tags:

  • sprintf
  • numbers
  • floating point
  • perl
  • printf

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  How to Work with Roman Numerals in Perl

  

  By gnat

  If you want to convert between regular numbers and Roman numerals, use the Roman module from CPAN: use Roman; $roman = roman($arabic); # convert to roman numerals &#...

  20 October 2009 - 03:30 PM | 0 Comments
  Tags:

  • CPAN
  • roman numerals
  • perl

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  How to Properly Capitalize a Title or Headline in Perl

  

  By gnat

  If you have a string representing a headline, the title of book, or some other work that needs proper capitalization, use a variant of this tc( ) titlecasing function: INIT { our %nocap;...

  20 October 2009 - 03:11 PM | 0 Comments
  Tags:

  • strings
  • capitalization
  • perl

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