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164 lines
2.5 KiB
Markdown
164 lines
2.5 KiB
Markdown
# Subtract
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You can use subtract to subtract numbers, as well as removing elements from an array.
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## Array subtraction
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Running
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```bash
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yq --null-input '[1,2] - [2,3]'
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```
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will output
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```yaml
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- 1
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```
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## Array subtraction with nested array
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Running
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```bash
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yq --null-input '[[1], 1, 2] - [[1], 3]'
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```
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will output
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```yaml
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- 1
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- 2
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```
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## Array subtraction with nested object
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Note that order of the keys does not matter
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Given a sample.yml file of:
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```yaml
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- a: b
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c: d
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- a: b
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```
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then
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```bash
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yq '. - [{"c": "d", "a": "b"}]' sample.yml
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```
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will output
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```yaml
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- a: b
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```
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## Number subtraction - float
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If the lhs or rhs are floats then the expression will be calculated with floats.
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Given a sample.yml file of:
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```yaml
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a: 3
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b: 4.5
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```
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then
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```bash
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yq '.a = .a - .b' sample.yml
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```
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will output
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```yaml
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a: -1.5
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b: 4.5
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```
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## Number subtraction - float
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If the lhs or rhs are floats then the expression will be calculated with floats.
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Given a sample.yml file of:
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```yaml
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a: 3
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b: 4.5
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```
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then
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```bash
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yq '.a = .a - .b' sample.yml
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```
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will output
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```yaml
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a: -1.5
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b: 4.5
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```
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## Number subtraction - int
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If both the lhs and rhs are ints then the expression will be calculated with ints.
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Given a sample.yml file of:
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```yaml
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a: 3
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b: 4
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```
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then
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```bash
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yq '.a = .a - .b' sample.yml
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```
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will output
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```yaml
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a: -1
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b: 4
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```
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## Decrement numbers
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Given a sample.yml file of:
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```yaml
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a: 3
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b: 5
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```
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then
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```bash
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yq '.[] -= 1' sample.yml
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```
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will output
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```yaml
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a: 2
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b: 4
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```
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## Date subtraction
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You can subtract durations from dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
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Given a sample.yml file of:
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```yaml
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a: 2021-01-01T03:10:00Z
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```
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then
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```bash
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yq '.a -= "3h10m"' sample.yml
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```
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will output
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```yaml
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a: 2021-01-01T00:00:00Z
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```
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## Date subtraction - custom format
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Use with_dtf to specify your datetime format. See [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
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Given a sample.yml file of:
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```yaml
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a: Saturday, 15-Dec-01 at 6:00AM GMT
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```
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then
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```bash
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yq 'with_dtf("Monday, 02-Jan-06 at 3:04PM MST", .a -= "3h1m")' sample.yml
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```
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will output
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```yaml
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a: Saturday, 15-Dec-01 at 2:59AM GMT
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```
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## Custom types: that are really numbers
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When custom tags are encountered, yq will try to decode the underlying type.
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Given a sample.yml file of:
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```yaml
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a: !horse 2
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b: !goat 1
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```
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then
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```bash
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yq '.a -= .b' sample.yml
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```
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will output
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```yaml
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a: !horse 1
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b: !goat 1
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```
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