I like the idea and hope you grow it into something of a pen-knife for numbers. Being able to change the bit width and base on the fly looks neat. I tend to pul

I like the idea and hope you grow it into something of a pen-knife for numbers. Being able to change the bit width and base on the fly looks neat. I tend to pull up a Python shell for lots of tasks. Often what I want is a dumper (like od, hexdump or tcpdump) with the ability to filter steams with masks and whatnot, like wireshark, and display the results in various "views" (hex, binary etc as you have provided). It is hard to make any one tool do all that - but also hard to find nicely pipeable little tools to work in a Unix way. It might be good to consider the contexts people will use your tool wrt stdio/sockets/fifos.