tech notes from my desk
To prevent a command from being added to the history in the first place, make sure that the environment variable HISTCONTROL contains among its colon-separated values the valueignorespace, for example (add e.g. to .bashrc):
$ export HISTCONTROL=ignorespace
This will prevent any command with a leading space from being added to the history. You can then clear the history completely by running
$ history -c -w ^-- additional space character
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