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Filter and reformat a data file
File Handling example from a Well House Consultants training course
More on File Handling [link]

This example is described in the following article(s):
   • Fresh Perl Teaching Examples - part 2 of 3 - [link]

Source code: tin Module: P207

# Sample answer to course exercise

# Look through a file of place names and find all those
# ending in Bridge. Format them nicely, and report which
# bridge number (NOT which line of the file!) they are.

open (FH,"towns.xyz") or die;

while ($line = <FH>) {

        if ($line =~ /Bridge$/) {

                $matched ++;
                chop $line;
                printf ("%20s is town no %4d\n",
                        $line, $matched);


rothy-2:j10p grahamellis$ perl tin
       Dunsop_Bridge is town no 1
     Hubberts_Bridge is town no 2
       Lowick_Bridge is town no 3
       Appley_Bridge is town no 4
        Spean_Bridge is town no 5
       Hebden_Bridge is town no 6
       Haydon_Bridge is town no 7
   Bonchester_Bridge is town no 8
     Skeabost_Bridge is town no 9
         Carr_Bridge is town no 10
      Dulnain_Bridge is town no 11
         Gara_Bridge is town no 12
       Steens_Bridge is town no 13
    Johnstone_Bridge is town no 14
      Newnham_Bridge is town no 15
       Whaley_Bridge is town no 16
         Mayo_Bridge is town no 17
      Ettrick_Bridge is town no 18
     Stamford_Bridge is town no 19
       Blythe_Bridge is town no 20
       Pooley_Bridge is town no 21
       Tummel_Bridge is town no 22
   Collingham_Bridge is town no 23
      Whitley_Bridge is town no 24
      Wootton_Bridge is town no 25
Dorothy-2:j10p grahamellis$

Learn about this subject
This module and example are covered on the following public courses:
 * Perl Programming
 * Perl bootcamp
 * Learning to program in Perl
 * Perl Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Perl are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "File Handling" training module. You'll find a description of the topic and some other closely related examples on the "File Handling" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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This web site is written and maintained by Well House Consultants.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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