Node script to convert an Etherium private key to an EOS private key.

eth-privkey-to-eos-privkey.js

Eos = require('eosjs');

var ethPrivateKey=process.argv[process.argv.length-1];
if (ethPrivateKey.length!=64) {
	console.error("Usage:", process.argv0, "{ETH Private Key}" );
	process.exit(1);
}

eosPrivateKey = Eos.modules.ecc.PrivateKey.fromHex(Buffer.from(ethPrivateKey, 'hex')).toString();
console.log("EOS Private Key:", eosPrivateKey);