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yq
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Line
Returns the line of the matching node. Starts from 1, 0 indicates there was no line data.
Note that versions prior to 4.18 require the 'eval/e' command to be specified.
yq e <exp> <file>

Returns line of value node

Given a sample.yml file of:
a: cat
b:
c: cat
then
yq '.b | line' sample.yml
will output
3

Returns line of key node

Pipe through the key operator to get the line of the key
Given a sample.yml file of:
a: cat
b:
c: cat
then
yq '.b | key| line' sample.yml
will output
2

First line is 1

Given a sample.yml file of:
a: cat
then
yq '.a | line' sample.yml
will output
1

No line data is 0

Running
yq --null-input '{"a": "new entry"} | line'
will output
0
Last modified 6mo ago
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Returns line of value node
Returns line of key node
First line is 1
No line data is 0