mirror of https://github.com/mikefarah/yq.git
72 lines
1.2 KiB
Markdown
72 lines
1.2 KiB
Markdown
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
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Note the use of eval-all to ensure all documents are loaded into memory.
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```bash
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yq eval-all 'select(fi == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
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```
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## Get filename
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Given a sample.yml file of:
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```yaml
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a: cat
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```
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then
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```bash
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yq eval 'filename' sample.yml
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```
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will output
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```yaml
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sample.yml
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```
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## Get file index
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Given a sample.yml file of:
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```yaml
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a: cat
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```
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then
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```bash
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yq eval 'fileIndex' sample.yml
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```
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will output
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```yaml
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0
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```
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## Get file indices of multiple documents
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Given a sample.yml file of:
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```yaml
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a: cat
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```
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And another sample another.yml file of:
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```yaml
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a: cat
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```
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then
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```bash
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yq eval-all 'fileIndex' sample.yml another.yml
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```
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will output
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```yaml
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0
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---
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1
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```
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## Get file index alias
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Given a sample.yml file of:
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```yaml
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a: cat
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```
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then
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```bash
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yq eval 'fi' sample.yml
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```
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will output
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```yaml
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0
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```
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