Usage 1: 3drename old_prefix new_prefix Will rename all datasets using the old_prefix to use the new_prefix; 3drename fred ethel will change fred+orig.HEAD to ethel+orig.HEAD fred+orig.BRIK to ethel+orig.BRIK fred+tlrc.HEAD to ethel+tlrc.HEAD fred+tlrc.BRIK.gz to ethel+tlrc.BRIK.gz Usage 2: 3drename old_prefix+view new_prefix Will rename only the dataset with the given view (orig, acpc, tlrc).