shasum with sha1 in node v0.9+

shasum.js

var hash = require('crypto').createHash('sha1')
hash.setEncoding('hex')
process.stdin.pipe(hash).pipe(process.stdout)

Usage:

$ echo -n dshaw | node shasum.js
> 9b8cebc0421241d087f6ab7e815285af803de7e7

That's real nice! :)