renrot's standard output looks like this: RENAMING / ROTATING =================== Processing file: (1 of 41) file1.tif... Processing file: (2 of 41) file2.tif... Processing file: (3 of 41) file3.tif... [snip] etc. There seems to be no --silent or --quiet option. This violates one of the main rules of The Unix Way (TM).