Convert all your existing addresses from bitcoind to segwit P2SH addresses (multisig will not work)

convertSegwit.js

'use strict';

// first, run   sudo apt-get install jq nodejs npm
// second, run   npm install bluebird co   to install dependencies, and make sure bitcoin-cli can run these commands.
// third, run   node thisScript.js   and it will change all the addresses on your bitcoind into segwit addresses.
var Promise = require('bluebird');
var co = require('co');
var exec = Promise.promisify(require('child_process').exec);

var main = function() {
    return co(function*() {
        var accountsString = yield exec("bitcoin-cli listaccounts | jq -r 'keys'");
        var accountsArray = JSON.parse(accountsString);
        var finalData = {};
        for (var i = 0; i < accountsArray.length; i++) {
            var addressesString = yield exec("bitcoin-cli getaddressesbyaccount \"" + accountsArray[i] + "\" | jq -r '.'");
            var addressesArray = JSON.parse(addressesString);
            finalData[accountsArray[i]] = {};
            for (var j = 0; j < addressesArray.length; j++) {
                if (addressesArray[j].slice(0,1) == "1") {
                    var segWitAddress = yield exec("bitcoin-cli addwitnessaddress " + addressesArray[j]);
                    finalData[accountsArray[i]][addressesArray[j]] = segWitAddress.trim();
                }
            }
        }
        return JSON.stringify(finalData, null, 2);
    });
};

main().then(function (result) { console.log(result) });