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How to clear bash history completely?

In every open bash shell (you may have multiple terminals open):
history -c
history -w
Why: As noted above, history -c empties the file ~/.bash_history. It is important to note that bash shell does not immediately flush history to the bash_history file. So, it is important to (1) flush the history to the file, and (2) clear the history, in all terminals. That's what the commands above do.

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