Two online books that I really appreciate and advise to any programmer using any reasonable (VB excluded :-P ) language:

The Art of Unix Programming by Eric S. Raymond. This is a high quality book talking about the essential points, important design principles, etc.

How to Be A Programmer by Robert L Read. Pretty nice document about the real life pragmatics of a programmer.

In reply to Re: Useful non-Perl-specific references by YAFZ
in thread Useful non-Perl-specific references by mr_mischief

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