qw(@con) is an error. Perl would have told you about it if you used strictures (use strict; use warnings;). Always use strictures. qw quotes 'words' where in this case a 'word' is any sequence of non-white space characters. @con is taken to be a word by qw so you are trying to assign a single element list to a hash - that doesn't do what you want.

Consider instead:

use strict;
use warnings;

my %con;

while (<DATA>) {
    chomp($_);
    next unless /^(.*?)=>(.*)/;
    
    $con{$1} = $2;
}

print "Key: $_, Value: $con{$_}\n" for sort keys %con;

__DATA__
article=>art
chapter=>chap
section=>sec
[download]

Prints:

Key: article, Value: art
Key: chapter, Value: chap
Key: section, Value: sec
[download]

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.