transfer.ts

import {
  Connection,
  Transaction,
  SystemProgram,
  sendAndConfirmTransaction,
  PublicKey,
} from "@solana/web3.js";
import "dotenv/config";
import { getKeypairFromEnvironment } from "@solana-developers/helpers";
  
const suppliedToPubkey = process.argv[2] || null;
  
if (!suppliedToPubkey) {
  console.log(`Please provide a public key to send to`);
  process.exit(1);
}
  
const senderKeypair = getKeypairFromEnvironment("SECRET_KEY");
  
const toPubkey = new PublicKey(suppliedToPubkey);
  
const connection = new Connection("https://api.devnet.solana.com", "confirmed");

const transaction = new Transaction();
 
const LAMPORTS_TO_SEND = 5000;

const sendSolInstruction = SystemProgram.transfer({
  fromPubkey: senderKeypair.publicKey,
  toPubkey,
  lamports: LAMPORTS_TO_SEND,
});
 
transaction.add(sendSolInstruction);

const before = new Date();
const signature = await sendAndConfirmTransaction(connection, transaction, [
  senderKeypair,
]);

const after = new Date();
const time = after.getTime() - before.getTime();
 
console.log(
  `💸 Finished! Sent ${LAMPORTS_TO_SEND} to the address ${toPubkey}. `,
);
console.log(`Transaction signature is ${signature}!`);
console.log(`Time taken: ${time}ms`);