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Front Matter
yq can process files with yaml front matter (e.g. jekyll, assemble and others) - this is done via the --front-matter/-f flag.Note that
yq only processes the first passed in file for front-matter. If you'd like to process multiple files, you can:find -name "*.md" -exec yq --front-matter="process" '.updated_at = now' {} \;
Use
--front-matter=process to process the front matter, that is run the expression against the yaml content, and output back the entire file, included the non-yaml content block. For example:File:
---
a: apple
b: bannana
---
<h1>I like {{a}} and {{b}} </h1>
The running
yq --front-matter=process '.a="chocolate"' file.jekyll
Will yield:
---
a: chocolate
b: bannana
---
<h1>I like {{a}} and {{b}} </h1>
Running with
--front-matter=extract will only output the yaml contents and ignore the rest. From the previous example, if you were to instead run:yq --front-matter=extract '.a="chocolate"' file.jekyll
Then this would yield:
---
a: chocolate
b: bannana
Last modified 1yr ago