exiftool -creator+="Bubba91" *.jpg



NOTE:	DO NOT use "artist", use "creator" instead so that both Windows and Photoshop can see this value.

			use += to append an additional artist to this file.  (duplicates are automatically ignored)
			use = to replace the file's artist

			Windows can only display metadata for JPG files
			Photoshop will display this as the "Author:"
			Windows will display this as "Authors"
			PNGquant does not remove this metadata
			This metadata is technically "xmp:creator" data  (it's XMP data, not EXIF data)

			Works with:		JPG, PNG, GIF*
			(No programs can display metadata stored in GIF files, but EXIFtool can read it)