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Comment by DyslexicAtheist | Hacker News Reader

have been tinkering with this idea also something like

   *echo -n 'my unique passphrase' |sha512sum*

only issue is this shows up in your memory and on disk (e.g. .bash_history)

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Prefix the command with a space and bash won't save it in its history.

This doesn't seem to be true in 4.3.42, at least not by default. " echo test" shows up in both the output of the 'history' builtin and in ~/.bash_history.

Is it an option that needs to be set?

Yes, you need to have HISTCONTROL=ignorespace option in your .bashrc

great thanks didn't know this one. Just checked and there is also

# don't put duplicate lines or lines starting with space in the history.

# See bash(1) for more options

HISTCONTROL=ignoreboth

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