Run the network without mining
geth --rpc --fast --cache 512 --ipcpath ~/Library/Ethereum/geth.ipc --networkid 15
mist --rpc --ipcpath ~/Library/Ethereum/geth.ipc --networkid 15
Run the network with mining
geth --rpc --cache 512 --ipcpath ~/Library/Ethereum/geth.ipc --networkid 15 --mine --minerthreads=1 --etherbase=0x0000000000000000000000000000000000000000
Attach to some specific network
geth --ipcpath ~/Library/Ethereum/geth.ipc --networkid 15 attach
solc --gas --bin --abi -o bin --overwrite greeter.sol