如何使用yq交换YAML文件中对象数组内的capacityScaler值？

To swap the capacityScaler values of the two backends in your YAML file, you can use yq's multi-assignment feature to directly exchange the values in one command. Here's how to do it:

Basic Command (Preview Output) #

Run this to see the swapped result without modifying your original file:

yq e '(.backends[0].capacityScaler, .backends[1].capacityScaler) = (.backends[1].capacityScaler, .backends[0].capacityScaler)' https_backend.yaml

This expression works by assigning the second backend's capacityScaler value to the first, and the first's value to the second—all in a single step, no temporary variables needed.

In-Place File Edit #

If you want to update the file directly instead of just previewing, add the -i (in-place) flag:

yq -i e '(.backends[0].capacityScaler, .backends[1].capacityScaler) = (.backends[1].capacityScaler, .backends[0].capacityScaler)' https_backend.yaml

Verify the Swap #

Confirm the change worked using your original command to list the values:

yq e '.backends[].capacityScaler' https_backend.yaml

You’ll now see the output:

1.0
0.0

Note #

This uses mikefarah/yq v4+ syntax (the version that uses yq e for evaluate mode), which matches the command you shared in your question. Older versions of yq use different syntax, but this will work with the setup you’re using.

内容的提问来源于stack exchange，提问作者SimpleNiko