Exactly how to add bitcoind params (e.g. "verbose") on command line?
Usually it's fairly descriptive if you know what's going on, for example it looks for a  boolean on the end of that command, so this will do as you wish.

bitcoin-cli getrawmempool true


bitcoin-cli has replaced bitcoind for RPC commands, you'll need to get used to it as the RPC client is being removed from the bitcoind binary fairly soon.