fds.js

var cp = require('child_process');
var child = cp.spawn('cat', [], {customFds:[0, 1, 2]});
child.stdout.on('data', function(d) {
  console.log(d);
});

gistfile2.txt

Enki:~ $ echo "foo" | node fds.js 

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
foo
TypeError: Cannot call method 'on' of null
    at Object.<anonymous> (/Users/croucher/fds.js:3:14)
    at Module._compile (module.js:404:26)
    at Object..js (module.js:410:10)
    at Module.load (module.js:336:31)
    at Function._load (module.js:297:12)
    at Array.<anonymous> (module.js:423:10)
    at EventEmitter._tickCallback (node.js:126:26)
Enki:~ $