The .sasv9.cfg file is a place to put options that would otherwise go on the command line when you invoke SAS. For instance, if I wanted to change my work directory to /sastemp7, I would ordinarily say
sas -work /sastemp7 mysasfile.sas &
when I run mysasfile.sas. If I want my work directory to always be in /sastemp7, I would open the file .sasv9.cfg and put this single line in it:
-work /sastemp7
Now every time SAS is invoked, it behaves as if it were invoked with
sas -work /sastemp7