Useful scripts for Go-Ethereum command line

geth-util.js

// Block with maximum transaction
var max=0;
for (var i = 0; i < eth.blockNumber; i++) {
    if (web3.eth.getBlock(max).transactions.length < web3.eth.getBlock(i).transactions.length) {
        console.log(i, web3.eth.getBlock(i).transactions.length);
        max = i;
    }
}

// auto-mining
var mining_threads = 1

function checkWork() {
    if (eth.getBlock("pending").transactions.length > 0) {
        if (eth.mining) return;
        console.log("== Pending transactions! Mining...");
        miner.start(mining_threads);
    } else {
        miner.stop();
        console.log("== No transactions! Mining stopped.");
    }
}

eth.filter("latest", function(err, block) { checkWork(); });
eth.filter("pending", function(err, block) { checkWork(); });

checkWork();