On Tue, 14 Jun 2011, Scott Raun wrote: > I'm actually planning on using the cygwin rsync, yes, it's in a Windows > environment. The exact paths are subject to change once I figure out > how cygwin refers to them. >>> >>> rsync -tru e:\data_tree d:\data_tree >>> rsync -tru d:\data_tree e:\data_tree Regarding Cygwin, but not rsync... On my Cygwin system, running on Windows XP, it can use the e:/ kind of reference or /cygdrive/e/. So I think what you have above would work except that you need to use forward slash instead of backslash (and use forward slashes in the paths as well): rsync -tru e:/data_tree d:/data_tree rsync -tru d:/data_tree e:/data_tree but this is probably the preferred method for Cygwin: rsync -tru /cygdrive/e/data_tree /cygdrive/d/data_tree rsync -tru /cygdrive/d/data_tree /cygdrive/e/data_tree Mike