on 2K8:

xp_ReadErrorLog 0, 1, 'listening'

-- Parameters defined:

-- Parameter 1 (int), is the number of the log file you want to read, default is "0" for current log.

-- Parameter 2 (int), value of 1 reads SQL error logs, value of 2 reads SQL Server Agent logs, with a default value of 1.

-- Parameter 3 varchar (255), is a search string for the log entry, with a default value of NULL.

-- Parameter 4 varchar (255), is another search string for the log entry, with a default value of NULL