Have you ever been bothered by the db2diag.log growing out of control? I have. While on Linux and Unix you have nice tools like logrotate and its analogs written in a number of script languages, no such luck if you run DB2 on Windows. There is no Windows port of logrotate, and your MSCE colleagues don’t always look favourably at you trying to install ActivePerl or Cygwin on a production server.
Having suffered enough from Notepad not being able to open a 300 megabyte db2diag.log, I have written a Windows command script to rotate the DB2 diagnostic log file. It uses only built-in Windows commands and therefore can run on any out of the box Windows 2000, Windows XP, or Windows 2003 system. By the way, it should work for any log files (with some limitations), not necessarily those generated by DB2.