It looks like a useful tool, thank you for taking the time to write it.

I realise that further down the page you explain what the various type definitions mean, but it might be nice to make that clear in the initial examples you give.

For instance, say:

    See the per-byte layout (_oh1_) of a larger integer in big (_ih4b_) or little (_ih4l_) endian format, separating each byte with a space (_Ps_).

    $ bo -n oh1 Ps ih4b 12345678
    12 34 56 78
    
    $ bo -n oh1 Ps ih4l 12345678
    78 56 34 12

It otherwise look a little bit like voodoo to the untrained eye!