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Document Index

Use the documentIndex operator (or the di shorthand) to select nodes of a particular document.

Retrieve a document index

Given a sample.yml file of:
a: cat
---
a: frog
then
yq '.a | document_index' sample.yml
will output
0
---
1

Retrieve a document index, shorthand

Given a sample.yml file of:
a: cat
---
a: frog
then
yq '.a | di' sample.yml
will output
0
---
1

Filter by document index

Given a sample.yml file of:
a: cat
---
a: frog
then
yq 'select(document_index == 1)' sample.yml
will output
a: frog

Filter by document index shorthand

Given a sample.yml file of:
a: cat
---
a: frog
then
yq 'select(di == 1)' sample.yml
will output
a: frog
Given a sample.yml file of:
a: cat
---
a: frog
then
yq '.a | ({"match": ., "doc": document_index})' sample.yml
will output
match: cat
doc: 0
match: frog
doc: 1