There is an undocumented dbcc command in ASE starting with v12.5.4 ESD#1 and v15.0.2, to manipulate one or many databases on a single dataserver. This is helpful, if for example a database cannot be loaded due to zombie processes holding a lock on the database, resulting in "Database in use"-errors when no-one is actually using the database.
Restarting the database will result in dbt_keep being 0, indicating that the database is not currently being used.

 
1> dbcc help(dbreboot)
2> go
dbreboot (report | reboot | reboot_norecovery | shutdown | shutdown_load | restart | restart_norecovery, dbname1 [, dbname2 ...])
Reboot the specified DATABASES.
1> dbcc dbreboot("shutdown","db_one")
2> go
---------- Shutting Down Database 'db_one' ----------
---------- Operation on Database 'db_one' Completed Successfully ----------
1> USE db_one
2> go
DATABASE db_one WITH dbid 5 IS already shut down.
1> sp_helpdb db_one
2> go
 name   db_size       owner dbid created      STATUS
 ------ ------------- ----- ---- ------------ ----------------------------
 db_one      300.0 MB sa       5 Jun 05, 2009 SELECT INTO/bulkcopy/pllsort
(1 row affected)
 device_fragments               size          usage                created                   free kbytes
 ------------------------------ ------------- -------------------- ------------------------- ----------------
 data00                              200.0 MB DATA only            Jun  5 2009 11:38AM                 199984
 log00                               100.0 MB log only             Jun  5 2009 11:38AM       NOT applicable
DATABASE db_one WITH dbid 5 IS already shut down.

Arguments for dbcc dbreboot are:

Be aware, as this is undocumented, use this command at your own risk and never ever on a production system! Do not contact Sybase Technical Support.