Get the Nth item from every list

Goal: Pull out, say, the second item of every list in a document — useful for sanity-checking that parallel lists stay in sync.

Prerequisites: None.

Query

.[1]

$ mq '.[1]' README.md

Input

- A1
- A2
- A3

1. B1
2. B2

Output

- A2
2. B2

Notes

• Indexing is 0-based and applies independently to each list node in the document — .[1] here returns the second bullet (A2) from the first list and the second ordered item (B2) from the second list.
• A list shorter than the requested index is skipped rather than erroring: .[2] against the input above would return only - A3, since the ordered list has no third item.