Although geared to the older problem of avoiding the password showing
up in "ps"
output, some of the techniques documented at http://www.isug.com/Sybase_FAQ/ASE/section4.html#4.1
are probably applicable.
There is also the approach of using the integrated login features of
network-based
security options (kerberos, etc.) - see the SA Guide chapter on
network-based
security.
Cheers,
bret