yq/pkg/yqlib/doc/operators/modulo.md

Number modulo - int

If the lhs and rhs are ints then the expression will be calculated with ints.

Given a sample.yml file of:

a: 13
b: 2

then

yq '.a = .a % .b' sample.yml

will output

a: 1
b: 2

Number modulo - float

If the lhs or rhs are floats then the expression will be calculated with floats.

Given a sample.yml file of:

a: 12
b: 2.5

then

yq '.a = .a % .b' sample.yml

will output

a: !!float 2
b: 2.5