I was trying to use radare2 some time ago when reverse engineering a printer driver. I couldn't grok it, so I gave up and just used `hd` and `grep`.
That's what I was looking for. (I do like CLI applications though.)
Thanks.
In Debian it's in the `bsdmainutils` package.
I found it very useful for doing the initial guess work about the binary printer control language I was looking at.