[riffraff]

maybe you are not aware of it, but there is a nifty little tool in freebsd called ministat that somewhat overlaps with what you did, maybe of interest:

http://www.freebsd.org/cgi/man.cgi?query=ministat&apropos=0&...

[codemac]

EXACTLY!

I converted this tool to linux for the archlinux package forever ago:

https://github.com/codemac/ministat

There are a few forks (adding autoconf, an osx branch, etc) as well.

[nferraz]

Nice! They definitely overlap, although there are a few differences... I'm not sure if ministat accepts bignum, scientific notation, etc.