Outputting all leaf keys (including duplicates) in a yaml file?

[embee1981]

Hi all

Apologies for yet another question.

I'm looking to output all the leaf keys in a yaml file such that I can flag if there are any duplicates present.

For a yaml file like:

bob: hello alice
bob: hello alice
something: here
blah:
  test: hello
  test: goodbye
  blah: argh
  more:
    nesting: here

I want to get yq to output:

bob
bob
something
blah.test
blah.test
blah.blah
blah.more.nesting

This would let me do something like

yq '<some command>' myFile.yaml | uniq -cd
and see

2 bob
2 blah.test

Something like
yq '(keys)[]'
will only handle the top level things:

bob
bob
something
blah

Looking at another discussion question, I can get close with
yq '.. | select((tag == "!!map" or tag == "!!seq") | not) | (path | join("."))'
which will give me all the keys but not the dupes:

bob
something
blah.test
blah.blah
blah.more.nesting

and
yq '... | select((tag == "!!map" or tag == "!!seq") | not) | (path | join("."))'
which shows the dupes but is showing too much

bob
bob
something
something
blah
blah.test
blah.test
blah.blah
blah.blah
blah.more
blah.more.nesting
blah.more.nesting

Is this possible with yq to get all keys, regardless of duplication, to output?

[mikefarah]

It's not valid yaml to have duplicate key names in a map

[embee1981]

Yeah the spec seems to suggest its up to the parser as to what to do here. yq allows the dupes through but I'd just like to flag there is a problem, either via a query or yq blowing up when it encounters something like this (with a nice error message)