This is controlled by the -OUTPUT qualifier. For example:-
-OUTPUT=SOURCE.DAT A single ouput fileIf the second or third forms above are used the possiblity exists that the same file name will be used more than once (i.e. 2 modules have the same MEMBER name). If such cases the modules are appended into a single file.
-OUTPUT=*.DAT Each member goes to a file bearing its member name
and the extension .DAT
-OUTPUT=*.* As for *.DAT but the extension name is controlled
by the LANGUAGE keyword. If this starts FORT then
a standard FORTRAN extension is used (currently this
is .for).