Is there any way to change a password hint without changing the password?
dscl . -merge /Users/username hint "your password hint"



Replace username with the short name of the account you wish to modify.
Replace your password hint with the hint you would like to set for the account.


dscl is the Directory Service command line utility.
. is the local machine.
-merge allows you to add a new key to a record path.
/Users/username is the record path for the key.
hint is the key you would like to assign a value.
your password hint is the string value for the key.