//with geth running -copy and paste this code to have a simple feedback of the blockchain syncing progress
geth --exec 'var s = eth.syncing; console.log("\n------------ GETH SYNCING PROGRESS\nprogress: " + (s.currentBlock/s.highestBlock*100)+ " %\nblocks left to parse: "+ (s.highestBlock-s.currentBlock) + "\ncurrent Block: " + s.currentBlock + " of " + s.highestBlock)' attach