Tip: you can prepend a space at the beginning of the command and it won't be saved in the history (though I agree that letting the command prompt for a password is better)
Excellent. Although that can be set to not do that. I've explicitly set it to "ignoreboth" for so long that I'd forgotten why, so it seems new to me today. :)
From man bash:
HISTCONTROL
A colon-separated list of values controlling how commands are
saved on the history list. If the list of values includes
ignorespace, lines which begin with a space character are not
saved in the history list. A value of ignoredups causes lines
matching the previous history entry to not be saved. A value of
ignoreboth is shorthand for ignorespace and ignoredups. A value
of erasedups causes all previous lines matching the current line
to be removed from the history list before that line is saved.
Any value not in the above list is ignored. If HISTCONTROL is
unset, or does not include a valid value, all lines read by the
shell parser are saved on the history list, subject to the value
of HISTIGNORE. The second and subsequent lines of a multi-line
compound command are not tested, and are added to the history
regardless of the value of HISTCONTROL.
