geth --verbosity

-verbosity value                   (default: 3)                       ($GETH_VERBOSITY)
         Logging verbosity: 0=silent, 1=error, 2=warn, 3=info, 4=debug, 5=detail

geth --verbosity=3

geth --help
geth init
geth --config

See also

• geth [ account | console | snapshot | --authrpc.addr | version | --sepolia | --goerli | --pprof | --http | --syncmode | --mine ] --rpc.evmtimeout | --ethstats | --help, Geth logs, geth logs WARN, Log.Error, ports: 8551, 30303, 8547, ~/.ethereum/geth/, --verbosity, --config, geth init, devp2p, p2psim, devp2p, geth dumpconfig