Misleading commands oggenc, oggdec and ogg123 should be vorbisenc, vorbisdec and vorbis123
In the vorbis-tools, several commands are named ogg{something}, but work not on every ogg file, but only on ogg vorbis ones.
Like any other Xiph's tools, they should be named according to the specific codec with which they work. vcut, vorbiscomment and ogginfo are named accurately, but oggdec, oggenc and ogg123 should be respectively named vorbisdec, vorbisenc and vorbis123.
As a matter of fact, ogginfo should go in th ogg-tools.