sp_helpgroup display the groups in the current database.
sp_helpgroup GROUPNAME displays a list of members.
sp_helprotect TABLENAME will display permission information (there must be a table in the current database)
sp_helprotect USERNAME will display user permission information
Please see some Sybase 1 and 2 system administration guides. As a new ASE user, you will find many of your answers there.
System Administrator Guide 1
System Administrator Guide 2
SyBooks Online for ASE
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