The -P flag turns loose the C preprocessor on your source before perl ever sees it. Its behavior is determined by the C standard, at least for the portable parts. The handiest source of information is probably a C primer.
In short, the C preprocessor makes direct textual substitution. with some logic available. I've never needed it for perl, but potentially useful constructs include,
- #include "filename" - inclusion of source from another file.
- #define foo some string or other - substitution macro definition
- #if, #elseif, #else, and friends allow for conditional inclusion of source.
None of this is really necessary to perl.
After Compline,
Zaxo
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