Fortran Command Summary

g77 [options] sourcefile

compile sourcefile, providing it is fixed-form format, where [options] can be any of the options below:

-ffree-form -fno-fixed-form	use free-form format.
-ff90	Support some of the constructs available in Fortran 90.
-I-, -IDIR	Files included by the Fortran INCLUDE directive are not preprocessed; thus, use -IDIR to search for INCLUDE files in directory DIR.
-x f77-cpp-input	Ensure that the source file is preprocessed by the preprocessor, cpp.