Hello, 

As a solution I made this : 

~~~

var through = require('through');
var tr = through(function write(data) {
        this.queue(data.toString().toUpperCase())
    },
    function end () {
        this.queue(null)
    });
process.stdin.pipe(tr).pipe(process.stdout);

~~~

Now I have read that in node 0.10 there is a transform class who can do the 
same.

Does anyone have a tip if this can be done and how I can do this ?

Roelof

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