term% ls -F
term% pwd
term% cat index.txt
F77(1)                      General Commands Manual                     F77(1)

       f77 - Fortran 77 compiler

       f77 [ option ] ... file ...

       F77 is the UNIX Fortran 77 compiler.  It accepts several types of argu‐

       Arguments whose names end with `.f' are taken to be Fortran  77  source
       programs;  they  are  compiled,  and each object program is left on the
       file in the current directory whose name is that  of  the  source  with
       `.o' substituted for '.f'.

       Arguments  whose  names end with `.r' or `.e' are taken to be Ratfor or
       EFL source programs, respectively; these are first transformed  by  the
       appropriate preprocessor, then compiled by f77.

       In  the same way, arguments whose names end with `.c' or `.s' are taken
       to be C or assembly source programs and are compiled or assembled, pro‐
       ducing a `.o' file.

       The following options have the same meaning as in cc(1).  See ld(1) for
       load-time options.

       -c     Suppress loading and produce `.o' files for each source file.

       -p     Prepare object files for profiling, see prof(1).

       -O     Invoke an object-code optimizer.

       -S     Compile the named programs,  and  leave  the  assembler-language
              output  on  corresponding files suffixed `.s'.  (No `.o' is cre‐

       -f     Use  a  floating  point  interpreter  (for  PDP11's  that   lack
              11/70-style floating point).

       -o output
              Name the final output file output instead of `a.out'.

       The following options are peculiar to f77.

              Compile  DO  loops  that are performed at least once if reached.
              (Fortran 77 DO loops are not performed at all if the upper limit
              is smaller than the lower limit.)

       -u     Make  the default type of a variable `undefined' rather than us‐
              ing the default Fortran rules.

       -C     Compile code to check that subscripts are within declared  array

       -w     Suppress  all  warning  messages.  If the option is `-w66', only
              Fortran 66 compatibility warnings are suppressed.

       -F     Apply EFL and Ratfor preprocessor to relevant files, put the re‐
              sult  in  the  file  with the suffix changed to `.f', but do not

       -m     Apply the M4 preprocessor to  each  `.r'  or  `.e'  file  before
              transforming it with the Ratfor or EFL preprocessor.

       -Ex    Use the string x as an EFL option in processing `.e' files.

       -Rx    Use the string x as a Ratfor option in processing `.r' files.

       Other  arguments  are  taken  to  be either loader option arguments, or
       F77-compatible object programs, typically produced by an  earlier  run,
       or  perhaps  libraries of F77-compatible routines.  These programs, to‐
       gether with the results of any compilations specified, are  loaded  (in
       the order given) to produce an executable program with name `a.out'.

       file.[fresc]      input file
       file.o            object file
       a.out             loaded output
       /usr/lib/f77pass1 compiler
       /lib/c1           pass 2
       /lib/c2           optional optimizer
       /usr/lib/libF77.a intrinsic function library
       /usr/lib/libI77.a Fortran I/O library
       /lib/libc.a       C library, see section 3

       S. I. Feldman, P. J. Weinberger, A Portable Fortran 77 Compiler
       prof(1), cc(1), ld(1)

       The diagnostics produced by f77 itself are intended to be self-explana‐
       tory.  Occasional messages may be produced by the loader.

       The Fortran 66 subset of the language has been  exercised  extensively;
       the newer features have not.