yq/README.md
2022-01-28 13:06:58 +11:00

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# yq
a lightweight and portable command-line YAML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as docker, all listed below.
## Notice for v4.x versions prior to 4.18.1
Since 4.18.1, yq's 'eval/e' command is the _default_ command and no longers needs to be specified.
Older versions will still need to specify 'eval/e'.
Similarly, '-' is no longer required as a filename to read from STDIN (unless reading from multiple files).
TLDR:
Prior to 4.18.1
```bash
cat file.yaml | yq e '.cool' -
```
4.18+
```bash
cat file.yaml | yq '.cool'
```
When merging multiple files together, `eval-all/ea` is still required to tell `yq` to run the expression again all the document at once.
## Quick Usage Guide
Read a value:
```bash
yq '.a.b[0].c' file.yaml
```
Pipe from STDIN:
```bash
cat file.yaml | yq '.a.b[0].c'
```
Update a yaml file, inplace
```bash
yq -i '.a.b[0].c = "cool"' file.yaml
```
Update using environment variables
```bash
NAME=mike yq -i '.a.b[0].c = strenv(NAME)' file.yaml
```
Merge multiple files
```
yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
```
Multiple updates to a yaml file
```bash
yq -i '
.a.b[0].c = "cool" |
.x.y.z = "foobar" |
.person.name = strenv(NAME)
' file.yaml
```
## Install
See the [github page](https://github.com/mikefarah/yq/#install) for the various ways you can install and use `yq`
## Known Issues / Missing Features
- `yq` attempts to preserve comment positions and whitespace as much as possible, but it does not handle all scenarios (see https://github.com/go-yaml/yaml/tree/v3 for details)
- Powershell has its own...[opinions on quoting yq](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks#quotes-in-windows-powershell)
See [tips and tricks](https://mikefarah.gitbook.io/yq/usage/tips-and-tricks) for more common problems and solutions.