From Zero to Transfer: Showing Off My First Solana CLI Tool

I built a small command line tool that sends SOL on devnet. I run it with a recipient address and an amount, and it loads my wallet, checks my balance, signs a transaction, and prints an Explorer link. If I try to send more than I have, it catches me before I waste any lamports. The screenshot below is a tiny SOL transfer I did today just to test it. Before building this I didn't really understand what a blockhash was. I learned that every transaction needs a recent one that expires in about a m