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Comment by cuu508 | Hacker News Reader

History can also contain potentially sensitive things like hostnames of non-public systems, usernames, filenames, URLs. I would not want that stuff to hang around indefinitely.

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You can tell your shell to ignore commands started with a space

    HISTCONTROL=ignorespace

Or you can use HISTIGNORE to always ignore specific patterns.

You can also use

    HISTCONTROL=ignoreboth

to use both ignorespace and ignoredups

This is one thing that atuin announced to solve: ignore patterns, keys, passwords. From the announcement I got that it's going to be far more useful than HISTIGNORE. Both out of the box and in abilities.

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