yq/pkg/yqlib/doc/Select.md

Select is used to filter arrays and maps by a boolean expression.
## Select elements from array
Given a sample.yml file of:
```yaml
- cat
- goat
- dog
```
then
```bash
yq eval '.[] | select(. == "*at")' sample.yml
```
will output
```yaml
cat
goat
```

## Select and update matching values in map
Given a sample.yml file of:
```yaml
a: {things: cat, bob: goat, horse: dog}
'': null
```
then
```bash
yq eval '(.a.[] | select(. == "*at")) |= "rabbit"' sample.yml
```
will output
```yaml
a: {things: rabbit, bob: rabbit, horse: dog}
'': null
```