Book:
Data Munging With Perl!!! By Dave Cross (davorg), it has a section on this (Chapter 7 - Fixed Width and Binary Data)
(it has a section on most stuff, it's nice).

Pedantry:

• Please clarify what you want to achieve in english, and use the code to support this.
• Please change your title, there are many ways to read data, how about "Reading fixed width fields"?

Off the Cuff:
Use regular expressions specifically @fields = m/(.{$width})/g; (as on page 129 of Data Munging With Perl)

--

Brother Frankus.

¤

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