Rename key

[sylvainbx]

Using yq V4, how to rename a key in a yaml document?

For example, I have the following document:

a:
  b:
    c: "lorem ipsum"

I would like to rename a.b to a.foo. Here's the expected result:

a:
  foo:
    c: "lorem ipsum"

I've looked around in the docs but I wasn't able to find any operator to accomplish that. Is this feasible?

[mikefarah]

Without being at my pc with yq - the best way I think this would work is something like:

yq `a.foo = a.b | del(a.b)`

[sylvainbx]

Thanks for you answer, it worked with adding dots at the beginning of each selectors

yq ".a.foo = .a.b | del(.a.b)"