How to sweep a bulk wallet?

Question

If I have a bulk wallet with, say 100000 key pairs (address/private key) and I have received payments on any, say 1000 of them, how can I sweep all the coins to a new address? It would be even better if I can do it from the command line, for example > sweep keypairs.txt 1Q7nrZ7PGWTtKVkQk1mLZovbJKEfLubXtv and all the available coins are transacted to the destination address. The format is for example:

1,"1E4MuBWjv2qZeJH5ti9ig5XMoJHQF63cdX","5JmLyBtdFEaKefsFXPd9E9PmbvT8JogG1V6Yer5jmZ9MX6bXP88"
2,"1BhJsijfGxwbzKgkQj5hRLDnBkmX2Y1RNN","5K5BBepZgaq8n9sJrsoM5inEWCX7W8bh7U8fr2wSP1PAkseasdQ"
3,"1ATP4LHYxqCZhDva661SLWJoN3vdNE2u1J","5JchXy3Y97F3TjaHsMJmyaaik1Gd4DpLP15PegbcvcZ5u2HBJg7"
...
100000,"17GX2ZFSpDip3BR6jMYP5He53tPMZqpSSG","5JyZsU9K2kokXzJQjg5F7mormCcwiPBcBjD3UZXHNwMSPuDGCNK"

Answer 1

A script exists on GitHub by the name of coinsweep.

Answer 2

One way is to use Blockchain's import function, although they have a limit of 400 private keys per wallet.

Really you want to use the importprivkey function from the official Bitcoin client and loop through the file line by line:

cat privates | while read key; do bitcoind importprivkey $key; done

This is assuming the file consists of only lines each containing nothing more than a private key. Your example formatting would thus need to have the count, public keys and quotation marks removed.