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Science
Programming Perl
by Larry Wall, Tom Christiansen, and Jon Orwant
The camel book. Still the deepest guide when legacy bioinformatics scripts speak Perl.
Hardcover, paperback, and Kindle editions when available.
ISBN-13
9780596000271
ASIN
0596000278
Why this book
Much of the field still runs on Perl glue. Wall, Christiansen, and Orwant remain the reference when you inherit a script that works and need to understand why before you dare rewrite it.