Add/remove a service - oracle database script

srvctl add servicec 
-d {DB_NAME} 
-s {SERVICE_NAME} 
-r {"preferred_list"} 
-a {"available_list"} 
[-P {BASIC | NONE | PRECONNECT}] 
 EXAMPLE: --------------- 
 srvctl add service -d PREDB -s PRDB_SRV -r "PREDB1,PREDB2" -a "PREDB2" -P BASIC  REMOVING A 
 SERVICE: 
 ------------------------------------------  
 SYNTAX: 
 ------------- 
 srvctl remove service -d {DB_NAME} -s {SERVICE_NAME}  
 EXAMPLE: 
 -------- 
 srvctl remove service -d PREDB -s PRDB_SRV