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Tag

The tag operator can be used to get or set the tag of nodes (e.g. !!str, !!int, !!bool).

Get tag

Given a sample.yml file of:
a: cat
b: 5
c: 3.2
e: true
f: []
then
yq '.. | tag' sample.yml
will output
!!map
!!str
!!int
!!float
!!bool
!!seq

type is an alias for tag

Given a sample.yml file of:
a: cat
b: 5
c: 3.2
e: true
f: []
then
yq '.. | type' sample.yml
will output
!!map
!!str
!!int
!!float
!!bool
!!seq

Set custom tag

Given a sample.yml file of:
a: str
then
yq '.a tag = "!!mikefarah"' sample.yml
will output
a: !!mikefarah str

Find numbers and convert them to strings

Given a sample.yml file of:
a: cat
b: 5
c: 3.2
e: true
then
yq '(.. | select(tag == "!!int")) tag= "!!str"' sample.yml
will output
a: cat
b: "5"
c: 3.2
e: true