Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Hi Monks, I have just started using Perl at work to help out with tasks here and there so I am new to this. Recently, I created this script to grab a list of records from a database. It actually works! I'm pretty thrilled.
open (FILE, "userstab.txt") || die "Cannot open file.\n"; open (NEWFILE, ">results.txt") || die "Cannot find or open file for ed +iting.\n"; while (<FILE>) { @zapschool = split (/\t/); if (m/zaps/i) { print NEWFILE "$zapschool[4]\n"; } } close FILE; close NEWFILE;

This gives me a list of all the entries in a column, but now I need to figure out how to use Perl to go through my new list, results.txt, and create a new list that holds the names and a count of how many times a partcular name appears on the list.

For example, my list contains college and university names. Many of them appear multiple times. I'd like to create a list where each unique record appears only once but with a frequency count of how many times it appears.

Can you offer some guidance on how to proceede? I'm not necessarily looking for finshed code, but more a point in the right direction so I can do it myself. Thank you.


In reply to Count and List Items in a List by Tech77

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others taking refuge in the Monastery: (7)
    As of 2015-07-07 06:00 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (87 votes), past polls