Just perform the work on the first document

[webdawg]

I am doing an in place replacement of a key, but since the yaml is more then just one document (a multi line yaml) it is replacing it in the first document, and then adding it to the next document? How do I just do the first?

I saw select statements in other discussions, but do not understand.

[webdawg]

yq eval -i '(select(.bootstrapTokens) | .bootstrapTokens[0].token) = "new value"'

[mikefarah]

Just pipe the select statements together, like consecutive filters:

yq eval -i '(select(documentIndex == 0) | select(.bootstrapTokens) | .bootstrapTokens[0].token) = "new value"'

Ref: https://mikefarah.gitbook.io/yq/operators/document-index