I believe something like this will do the trick:

<$button>Genus Swap
<$list filter="[field:genus[someA]]">
<$action-setfield $field="genus" $value="someB"/>
</$list>
</$button>

Absolutely make a backup of your TW file before trying this. There's always 
the possibility of something going off the rails when doing bulk changes 
like this.

-- Mark

On Monday, February 5, 2018 at 11:28:49 AM UTC-8, Shawn Murdock wrote:
>
> First off, I would like to thank all the devs that work on this project. 
> Tiddlywiki is the best thing I have come across in a while. Hopefully 
> someday I will understand the mechanics enough to help with it.
>
> But, at this point I have a question. I have one tiddywiki which I am 
> using as notes / database (of sorts) for my plant collection. All of my 
> individual plant tiddlers have several fields. I would like to modify the 
> same field on all of the plant tiddlers; is there an easy way to do it 
> without having to edit each one by hand?
>
> To clarify: say I have 200 plant tiddlers each with a field for the genus 
> of the plant. I want to change all of them from "somegenusA" to 
> "somegenusB". How can I bulk change a number of tiddlers easily? Is there a 
> way in tiddlywiki or do I have to edit the actual file?
>
> Thanks for the help. 
>

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