[LCP]printf format question.

[Matteo Ianeselli]

Pare che David Filion, in un momento di ispirazione, abbia scritto:

 > printf (_("Try `%s --help' for more information.\n"),  program_name);

This is almost surely a GNU source using GNU GetText() for i18n.

`_' is a legal name for a symbol (variable, function, etc.), and it is
common practice to use that with GetText. 

Basically, `_()' is a function returning the localized version of a
string, according to a message catalog chosen via the LANG environment
variable. 

There is a special exception in GNU coding standards allowing such an
unusual function call.
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