Also, in most common cases, won’t be written to history file if the command is prefixed with a space (see HISTCONTROL).

You have a typo: it should be `HISTFILE`, not `HIST_FILE`.

> or if you `unset HIST_FILE`

I figured I'd learn something by putting in the "I'd love to know others" bit, but this is something I didn't know I could do, and is genuinely useful to know!