** Init

geth --datadir /home/gas/projects/ethereum/datadir init /home/gas/projects/ethereum/dev/genesis.json

** Run command line

geth --fast --cache 512 --ipcpath /home/gas/projects/ethereum/lib/geth.ipc --networkid 1234 --datadir /home/gas/projects/ethereum/datadir console 

** Run without command line

geth --fast --cache 512 --ipcpath /home/gas/projects/ethereum/lib/geth.ipc --networkid 1234 --datadir /home/gas/projects/ethereum/datadir --ipcapi "admin,db,eth,debug,miner,net,shh,txpool,personal,web3"