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README: document HIST_FIND_NO_DUPS as alternative

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Elliott Cable wrote:

> HIST_IGNORE_ALL_DUPS doesn't provide the functionality I want;
>
> I don't want my history actually modified; I simply want to skip
> duplicate entries when using my history-substring-search keybind. |=<

https://github.com/zsh-users/zsh-history-substring-search/issues/19#issuecomment-90289051
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Suraj N. Kurapati 2015-04-06 17:16:33 -07:00
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README.md
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@ -104,6 +104,12 @@ default values only after having loaded this script into your ZSH session.
values you may assign to this variable.
To always receive _unique_ search results, use `setopt HIST_IGNORE_ALL_DUPS`.
Alternatively, use `setopt HIST_FIND_NO_DUPS` which makes this plugin skip
duplicate _adjacent_ search results as you cycle through them---however, this
does not guarantee that search results are unique: if your search results were
"Dog", "Dog", "HotDog", "Dog", then cycling them gives "Dog", "HotDog", "Dog".
Notice that the "Dog" search result appeared twice as you cycled through them!
If you wish to avoid this limitation, then use `setopt HIST_IGNORE_ALL_DUPS`.
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