mirror of https://github.com/mikefarah/yq.git
59 lines
1.0 KiB
Markdown
59 lines
1.0 KiB
Markdown
For more complex scenarios, variables can be used to hold values of expression to be used in other expressions.
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## Single value variable
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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 '.a as $foo | $foo' sample.yml
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```
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will output
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```yaml
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cat
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```
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## Multi value variable
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Given a sample.yml file of:
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```yaml
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- cat
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- dog
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```
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then
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```bash
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yq eval '.[] as $foo | $foo' sample.yml
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```
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will output
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```yaml
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cat
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dog
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```
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## Using variables as a lookup
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Example taken from [jq](https://stedolan.github.io/jq/manual/#Variable/SymbolicBindingOperator:...as$identifier|...)
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Given a sample.yml file of:
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```yaml
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"posts":
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- "title": Frist psot
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"author": anon
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- "title": A well-written article
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"author": person1
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"realnames":
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"anon": Anonymous Coward
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"person1": Person McPherson
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```
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then
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```bash
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yq eval '.realnames as $names | .posts[] | {"title":.title, "author": $names[.author]}' sample.yml
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```
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will output
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```yaml
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title: Frist psot
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author: Anonymous Coward
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title: A well-written article
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author: Person McPherson
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```
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