How can I move bitcoin-qt blockchain data to bitcoind daemon? I have a bunch of files like blk00110.dat now that bitcoin-qt (on my mac) has finally updated. I'd like to just move this over to my linux box so I can keep it up and running but the bitcoind program uses a different structure. How can I move this data?
There should be a .bitcoin directory once you install bitcoind on your linux box. Copying those .dat files in this directory should enable bitcoind to read them directly.

Bitcoin-QT is actually using bitcoind under the hood. So it shouldn't be using different structure unless you're using different versions of bitcoind.

Edit: also reading more about bitcoind commands, there's a command to import a file directly. So this should probably be better than directly placing the files in the directory:

bitcoind -loadblock=&lt;file&gt;      Imports blocks from external blk000??.dat file