Greeting, I am new to PERL, and I dont know how to implement this multiple sort key. I am trying to sort given array with given selected column. See below code 
#!/usr/bin/perl

use strict;


my @employees = ( 
    { FIRST => 'Bill',   LAST => 'Gates',     
      SALARY => 600000, AGE => 45 },
    { FIRST => 'George', LAST => 'Tester',
      SALARY =>  55000, AGE => 29 },
    { FIRST => 'Sally',  LAST => 'Developer', 
      SALARY =>  55000, AGE => 29 },
    { FIRST => 'Joe',    LAST => 'Tester',    
      SALARY =>  55000, AGE => 29 },
    { FIRST => 'Steve',  LAST => 'Ballmer',   
      SALARY => 600000, AGE => 41 } 
);

sub seniority {
    $a->{FIRST} cmp $b->{FIRST} or $a->{AGE} <=> $b->{AGE}
}

my $sort = "FIRST, AGE";
my @sorts = split( ',', $sort );
my @ranked;

    for( @sorts ) 
    { 
    @ranked = sort seniority @employees;
    }
foreach my $emp (@ranked) {
    print "$emp->{SALARY}\t$emp->{AGE}\t$emp->{FIRST}\t$emp->{LAST}\n"
+;
}

[download]
Let say I want to sort only the Last, and Salary. then I'd have to change {FIRST} or {AGE} value in this case. Also, What if I want to add $sort key, ex) "FIRST, AGE, LAST", I'd have to add method to seniority, but dont know how. This would be great example for multiple sort given key variables. I would try to use basic 'sort' method as possible, not modifying or inserting new Sort::Key, or any other. UPDATE : This problem was solved using kennethk's method. Please see below for additional info.

In reply to Multiple Sort on selected column by huchister

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.