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Working with Properties
Encode to a property file (decode not yet supported). Line comments on value nodes will be copied across.
By default, empty maps and arrays are not encoded - see below for an example on how to encode a value for these.
Note that versions prior to 4.18 require the 'eval/e' command to be specified.
yq e <exp> <file>

Encode properties

Note that empty arrays and maps are not encoded by default.
Given a sample.yml file of:
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# block comments don't come through
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person: # neither do comments on maps
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name: Mike # comments on values appear
4
pets:
5
- cat # comments on array values appear
6
food: [pizza] # comments on arrays do not
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emptyArray: []
8
emptyMap: []
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then
1
yq -o=props sample.yml
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will output
1
# comments on values appear
2
person.name = Mike
3
4
# comments on array values appear
5
person.pets.0 = cat
6
person.food.0 = pizza
Copied!

Encode properties: no comments

Given a sample.yml file of:
1
# block comments don't come through
2
person: # neither do comments on maps
3
name: Mike # comments on values appear
4
pets:
5
- cat # comments on array values appear
6
food: [pizza] # comments on arrays do not
7
emptyArray: []
8
emptyMap: []
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then
1
yq -o=props '... comments = ""' sample.yml
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will output
1
person.name = Mike
2
person.pets.0 = cat
3
person.food.0 = pizza
Copied!

Encode properties: include empty maps and arrays

Use a yq expression to set the empty maps and sequences to your desired value.
Given a sample.yml file of:
1
# block comments don't come through
2
person: # neither do comments on maps
3
name: Mike # comments on values appear
4
pets:
5
- cat # comments on array values appear
6
food: [pizza] # comments on arrays do not
7
emptyArray: []
8
emptyMap: []
Copied!
then
1
yq -o=props '(.. | select( (tag == "!!map" or tag =="!!seq") and length == 0)) = ""' sample.yml
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will output
1
# comments on values appear
2
person.name = Mike
3
4
# comments on array values appear
5
person.pets.0 = cat
6
person.food.0 = pizza
7
emptyArray =
8
emptyMap =
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Decode properties

Given a sample.properties file of:
1
# comments on values appear
2
person.name = Mike
3
4
# comments on array values appear
5
person.pets.0 = cat
6
person.food.0 = pizza
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then
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yq -p=props sample.properties
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will output
1
person:
2
name: Mike # comments on values appear
3
pets:
4
- cat # comments on array values appear
5
food:
6
- pizza
Copied!

Roundtrip

Given a sample.properties file of:
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# comments on values appear
2
person.name = Mike
3
4
# comments on array values appear
5
person.pets.0 = cat
6
person.food.0 = pizza
Copied!
then
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yq -p=props -o=props '.person.pets.0 = "dog"' sample.properties
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will output
1
# comments on values appear
2
person.name = Mike
3
4
# comments on array values appear
5
person.pets.0 = dog
6
person.food.0 = pizza
Copied!