Q:

How do I delete the geth console history?

how do I delete the geth console history ?
I'm concerned with this, especially in light of this recent Mist hack :

On the console you can also unlock accounts (one at a time).
personal.unlockAccount(address, "password")
Note that we do NOT recommend using the password argument here, since
  the console history is logged, so you may compromise your account. You
  have been warned.

A:

There's a history file in Geth's datadir that you can delete.
The default datadir is:
Mac: ~/Library/Ethereum
Linux: ~/.ethereum
Windows: %APPDATA%/Ethereum

