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Re: Deleting entries in history
- X-seq: zsh-users 24720
- From: Manfred Lotz <ml_news@xxxxxxxxx>
- To: zsh-users@xxxxxxx
- Subject: Re: Deleting entries in history
- Date: Sat, 7 Mar 2020 12:47:01 +0100
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On Fri, 6 Mar 2020 13:15:10 -0800
Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx> wrote:
> On Fri, Mar 6, 2020 at 11:55 AM Manfred Lotz <ml_news@xxxxxxxxx>
> wrote:
> >
> > What is the proper way to delete entries in the history?
> >
> > Just load the history file in an editor, deleting things and save
> > it?
>
> The first thing to note is that when $SAVEHIST is nonzero, zsh will
> typically update the file when the shell exits, so anything that is in
> the runtime history of the current shell might reappear even after it
> is deleted from the file. I say "might" because this is affected by
> the assorted setopts that control how the history is maintained. The
> only safe way to directly edit the history is to make sure no other
> zsh is running that might rewrite it, and then set SAVEHIST=0 in your
> current shell before doing anything else.
>
Ok, this means it is best done directly after reboot when I open the
first zsh shell.
> Once you are sure you have done that, then it should be OK to use an
> editor on the history file. Be aware that multi-line events (such as
> "for" or "while" loops) are stored with lines terminated by backslash,
> so if you start deleting a line that ends in backslash you need to
> also delete all the adjacent lines that end in backslash, up to and
> including the next following line that does NOT end in a backslash.
> Single-line events never contain a backslash.
>
OK, I can check this.
> If you are using any of the setopts that store timestamped history
> entries, each event will be prefixed by a ":" command that ends at the
> next ";", with the timestamp between. You should delete these along
> with the event you want to remove, and avoid altering any that are on
> other event lines.
Yep, I have those.
>
> All that said ... if the events you want to delete can all be matched
> by some simple patterns, you might want to look into either a
> zshaddhistory hook function, or a setting of the HISTORY_IGNORE
> parameter.
I already use zshaddhistory for some commands I don't want to see in
the zsh history.
Thanks.
--
Manfred
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