var fs  = require('fs');
var ws = fs.createWriteStream('log.txt', {
        'flags'   : 'w',
        'encoding': 'utf8',
        'mode'    : 0666,
    });

process.stdout.wr = process.stdout.write;
process.stdout.er = process.stderr.write;

process.stdout.write = function(mes, c) {
    ws.write(mes + 'rn');
    process.stdout.wr(mes, c)
};

process.stderr.write = function(mes, c) {
    ws.write(mes + 'rn');
    process.stdout.er(mes, c)
};