mentioned, Unix sort(1) is a great tool for this, although the syntax sometimes requires a little trial and error.
To do this from Perl, read each line into some kind of data structure, then define your own sorting function that compares two of these data structures by looking at each of the fields, returning 1 if the first is greater, -1 if the second is greater, or going on to the next field if they are the same. The cmp and <=> ("spaceship") operators will help you with this, and they can be cascaded with the || "or" operator.
Here's a simple example (untested):
return $a-> <=> $b->
$a-> <=> $b->
$a-> cmp $b->
push @list, [ split ];
@list = sort mysort @list;
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:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- 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
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||