Question : rowcount delete

I need a this delete query to stop at 100,000 rows. How do I do this, rowcount? Basically this is to prevent the log from choking. I am using Sybase ASE 12.0.

delete from logtable where username = 'testuser' and datediff(dd, commandDate, getdate()) > 30

Answer : rowcount delete

set rowcount 100000
go
delete from logtable where username = 'testuser' and datediff(dd, commandDate, getdate()) > 30