yq/pkg/yqlib/doc/headers/File Operators.md

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File operators are most often used with merge when needing to merge specific files together. Note that when doing this, you will need to use `eval-all` to ensure all yaml documents are loaded into memory before performing the merge (as opposed to `eval` which runs the expression once per document).
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Note that the `fileIndex` operator has a short alias of `fi`.
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## Merging files
Note the use of eval-all to ensure all documents are loaded into memory.
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```bash
yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
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```