Equals

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Equals

This is a boolean operator that will return true if the LHS is equal to the RHS and false otherwise.
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.a == .b
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It is most often used with the select operator to find particular nodes:
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select(.a == .b)
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The not equals != operator returns false if the LHS is equal to the RHS.
Related Operators
comparison (>=, < etc) operators here​
boolean operators (and, or, any etc) here​
select operator here​
Note that versions prior to 4.18 require the 'eval/e' command to be specified.
yq e <exp> <file>
Match string
Given a sample.yml file of:
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- cat
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- goat
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- dog
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then
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yq '.[] | (. == "*at")' sample.yml
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will output
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true
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true
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false
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Don't match string
Given a sample.yml file of:
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- cat
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- goat
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- dog
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then
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yq '.[] | (. != "*at")' sample.yml
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will output
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false
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false
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true
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Match number
Given a sample.yml file of:
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- 3
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- 4
3
- 5
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then
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yq '.[] | (. == 4)' sample.yml
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will output
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false
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true
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false
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Don't match number
Given a sample.yml file of:
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- 3
2
- 4
3
- 5
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then
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yq '.[] | (. != 4)' sample.yml
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will output
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true
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false
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true
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Match nulls
Running
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yq --null-input 'null == ~'
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will output
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true
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Non existent key doesn't equal a value
Given a sample.yml file of:
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a: frog
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then
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yq 'select(.b != "thing")' sample.yml
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will output
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a: frog
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Two non existent keys are equal
Given a sample.yml file of:
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a: frog
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then
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yq 'select(.b == .c)' sample.yml
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will output
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a: frog
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Env Variable Operators

Eval

Last modified 1mo ago

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Non existent key doesn't equal a value

Two non existent keys are equal