FSUM3090 Usage: c89 [-CcEgOrsVv0123]
[-D name[=value]]... [-U name]...
[-e function]... [-u function]...
[-W phase,option[,option]...]...
[-o outfile]
[-I directory]... [-L directory]...
[file.c]... [file.i]... [file.s]...
[file.o]...
[file.x]... [file.p]... [file.I]...
[file.a]... [-l libname]...

Explanation
 This message shows the correct format of the c89 command.
 It is displayed only when you enter c89 without
any  arguments.