yq/README.md

# yq

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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.

## Quick Usage Guide

Read a value:
```bash
yq e '.a.b[0].c' file.yaml
```

Pipe from STDIN:
```bash
cat file.yaml | yq e '.a.b[0].c' -
```

Update a yaml file, inplace
```bash
yq e -i '.a.b[0].c = "cool"' file.yaml
```

Update using environment variables
```bash
NAME=mike yq e -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 e -i '
  .a.b[0].c = "cool" |
  .x.y.z = "foobar" |
  .person.name = strenv(NAME)
' file.yaml
```

See the [documentation](https://mikefarah.gitbook.io/yq/) for more.

## Install

### [Download the latest binary](https://github.com/mikefarah/yq/releases/latest)

### wget
Use wget to download the pre-compiled binaries:

#### Compressed via tar.gz
```bash
wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY}.tar.gz -O - |\
  tar xz && mv ${BINARY} /usr/bin/yq
```

#### Plain binary

```bash
wget https://github.com/mikefarah/yq/releases/download/${VERSION}/${BINARY} -O /usr/bin/yq &&\
    chmod +x /usr/bin/yq
```

For instance, VERSION=v4.2.0 and BINARY=yq_linux_amd64

### MacOS / Linux via Homebrew:
Using [Homebrew](https://brew.sh/)
```
brew install yq
```

### Linux via snap:
```
snap install yq
```

#### Snap notes
`yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:

```
sudo cat /etc/myfile | yq e '.a.path' - 
```

And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
```
sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
```
or write to a temporary file:
```
sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
sudo mv /etc/myfile.tmp /etc/myfile
rm /etc/myfile.tmp
```

### Run with Docker

#### Oneshot use:

```bash
docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
```

#### Pipe in via STDIN:

You'll need to pass the `-i\--interactive` flag to docker:

```bash
cat myfile.yml | docker run -i --rm mikefarah/yq e . -
```

#### Run commands interactively:

```bash
docker run --rm -it -v "${PWD}":/workdir --entrypoint sh mikefarah/yq
```

It can be useful to have a bash function to avoid typing the whole docker command:

```bash
yq() {
  docker run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
}
```


#### Running as root:

`yq`'s docker image no longer runs under root (https://github.com/mikefarah/yq/pull/860). If you'd like to install more things in the docker image, or you're having permissions issues when attempting to read/write files you'll need to either:


```
docker run --user="root" -it --entrypoint sh mikefarah/yq
```

Or, in your docker file:

```
FROM mikefarah/yq

USER root
RUN apk add bash
USER yq
```

### GitHub Action
```
  - name: Set foobar to cool
    uses: mikefarah/yq@master
    with:
      cmd: yq eval -i '.foo.bar = "cool"' 'config.yml'
```

See https://mikefarah.gitbook.io/yq/usage/github-action for more.

### Go Get:
```
GO111MODULE=on go get github.com/mikefarah/yq/v4
```

## Community Supported Installation methods
As these are supported by the community :heart: - however, they may be out of date with the officially supported releases.

# Webi

```
webi yq
```

See [webi](https://webinstall.dev/)
Supported by @adithyasunil26 (https://github.com/webinstall/webi-installers/tree/master/yq)

### Windows:
[![Chocolatey](https://img.shields.io/chocolatey/v/yq.svg)](https://chocolatey.org/packages/yq)
[![Chocolatey](https://img.shields.io/chocolatey/dt/yq.svg)](https://chocolatey.org/packages/yq)
```
choco install yq
```
Supported by @chillum (https://chocolatey.org/packages/yq)

### Mac:
Using [MacPorts](https://www.macports.org/)
```
sudo port selfupdate
sudo port install yq
```
Supported by @herbygillot (https://ports.macports.org/maintainer/github/herbygillot)

### Alpine Linux
- Enable edge/community repo by adding ```$MIRROR/alpine/edge/community``` to ```/etc/apk/repositories```
- Update database index with ```apk update```
- Install yq with ```apk add yq```

Supported by Tuan Hoang
https://pkgs.alpinelinux.org/package/edge/community/x86/yq


### On Ubuntu 16.04 or higher from Debian package:
```sh
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64
sudo add-apt-repository ppa:rmescandon/yq
sudo apt update
sudo apt install yq -y
```
Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)

## Features
- [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
- Written in portable go, so you can download a lovely dependency free binary
- Uses similar syntax as `jq` but works with YAML and JSON files
- Fully supports multi document yaml files
- Supports yaml [front matter](https://mikefarah.gitbook.io/yq/usage/front-matter) blocks (e.g. jekyll/assemble)
- Colorized yaml output
- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
- Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
- [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
- Keeps yaml formatting and comments when updating (though there are issues with whitespace)
- [Convert to/from json](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
- [Convert to properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
- [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
- [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.
- [Github Action](https://mikefarah.gitbook.io/yq/usage/github-action) to use in your automated pipeline (thanks @devorbitus)

## [Usage](https://mikefarah.gitbook.io/yq/)

Check out the [documentation](https://mikefarah.gitbook.io/yq/) for more detailed and advanced usage.

```
Usage:
  yq [flags]
  yq [command]

Available Commands:
  eval             Apply the expression to each document in each yaml file in sequence
  eval-all         Loads _all_ yaml documents of _all_ yaml files and runs expression once
  help             Help about any command
  shell-completion Generate completion script

Flags:
  -C, --colors                force print with colors
  -e, --exit-status           set exit status if there are no matches or null or false is returned
  -f, --front-matter string   (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
      --header-preprocess     Slurp any header comments and seperators before processing expression. This is a workaround for go-yaml to persist header content (default true)
  -h, --help                  help for yq
  -I, --indent int            sets indent level for output (default 2)
  -i, --inplace               update the yaml file inplace of first yaml file given.
  -M, --no-colors             force print with no colors
  -N, --no-doc                Don't print document separators (---)
  -n, --null-input            Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
  -o, --output-format string  [yaml|y|json|j|props|p] output format type. (default "yaml")
  -P, --prettyPrint           pretty print, shorthand for '... style = ""'
      --unwrapScalar          unwrap scalar, print the value with no quotes, colors or comments (default true)
  -v, --verbose               verbose mode
  -V, --version               Print version information and quit

Use "yq [command] --help" for more information about a command.
```
## 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.