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+.TH EFL 1
+.SH NAME
+efl \- extended Fortran language preprocessor
+.SH SYNOPSIS
+.B efl
+[
+.I option ...
+]
+[
+.I filename ...
+]
+.SH DESCRIPTION
+.I Efl
+compiles a program written in the EFL language into clean Fortran.
+.I Efl
+provides the same control flow constructs as does Ratfor (1),
+which are essentially identical to those in C:
+.TP
+statement grouping with braces;
+decision-making with if, if-else, and switch-case;
+while,
+for,
+Fortran do,
+repeat,
+and repeat...until loops;
+multi-level break and next.
+In addition, EFL has C-like data structures,
+and more uniform and convenient input/output syntax,
+generic functions.
+EFL also provides
+some syntactic sugar to make programs easier to read and write:
+.TP
+free form input:
+multiple statements/line; automatic continuation
+statement label names (not just numbers),
+.TP
+comments:
+# this is a comment
+.TP
+translation of relationals:
+>, >=, etc., become .GT., .GE., etc.
+.TP
+return (expression)
+returns expression to caller from function
+.TP
+define:
+define name replacement
+.TP
+include:
+include filename
+.PP
+.fi
+The Efl command option
+.B \-w
+suppresses warning messages.
+The option
+.B \-C
+causes comments to be copied through to the Fortran output (default);
+.B \-#
+prevents comments from being copied through.
+If a command argument contains an embedded equal sign,
+that argument is treated as if it had appeared in an
+.B option
+statement at the beginning of the program.
+.I Efl
+is best used with
+.IR f77 (1).
+.SH "SEE ALSO"
+.IR f77 (1),
+.IR ratfor (1).
+.br
+S. I. Feldman,
+.IR "The Programming Language EFL",
+Bell Labs Computing Science Technical Report #78.