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126 lines
5.2 KiB
Markdown
126 lines
5.2 KiB
Markdown
# yq
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[](https://travis-ci.com/mikefarah/yq/)   
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a lightweight and portable command-line YAML processor
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The aim of the project is to be the [jq](https://github.com/stedolan/jq) or sed of yaml files.
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## New version!
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V3 is officially out - if you've been using v2 and want/need to upgrade, checkout the [upgrade guide](https://mikefarah.gitbook.io/yq/upgrading-from-v2).
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## Install
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### [Download the latest binary](https://github.com/mikefarah/yq/releases/latest)
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### MacOS:
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```
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brew install yq
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```
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### Ubuntu and other Linux distros supporting `snap` packages:
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```
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snap install yq
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```
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#### Snap notes
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`yq` installs with 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:
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```
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sudo cat /etc/myfile | yq r - a.path
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```
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And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
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```
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sudo cat /etc/myfile | yq w - a.path value | sudo sponge /etc/myfile
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```
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or write to a temporary file:
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```
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sudo cat /etc/myfile | yq w - a.path value | sudo tee /etc/myfile.tmp
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sudo mv /etc/myfile.tmp /etc/myfile
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rm /etc/myfile.tmp
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```
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### On Ubuntu 16.04 or higher from Debian package:
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```sh
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sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64
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sudo add-apt-repository ppa:rmescandon/yq
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sudo apt update
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sudo apt install yq -y
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```
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Supported by @rmescandon
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### Go Get:
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```
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GO111MODULE=on go get github.com/mikefarah/yq/v3
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```
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## Run with Docker
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Oneshot use:
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```bash
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docker run --rm -v ${PWD}:/workdir mikefarah/yq yq [flags] <command> FILE...
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```
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Run commands interactively:
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```bash
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docker run --rm -it -v ${PWD}:/workdir mikefarah/yq sh
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```
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It can be useful to have a bash function to avoid typing the whole docker command:
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```bash
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yq() {
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docker run --rm -i -v ${PWD}:/workdir mikefarah/yq yq $@
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}
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```
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## Features
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- Written in portable go, so you can download a lovely dependency free binary
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- [Deep read a yaml file with a given path expression](https://mikefarah.gitbook.io/yq/commands/read#basic)
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- [List matching paths of a given path expression](https://mikefarah.gitbook.io/yq/commands/read#path-only)
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- Update a yaml file given a [path expression](https://mikefarah.gitbook.io/yq/commands/write-update#basic) or [script file](https://mikefarah.gitbook.io/yq/commands/write-update#basic)
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- Update creates any missing entries in the path on the fly
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- Deeply [compare](https://mikefarah.gitbook.io/yq/commands/compare) yaml files
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- Keeps yaml formatting and comments when updating
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- [Validate a yaml file](https://mikefarah.gitbook.io/yq/commands/validate)
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- Create a yaml file given a [deep path and value](https://mikefarah.gitbook.io/yq/commands/create#creating-a-simple-yaml-file) or a [script file](https://mikefarah.gitbook.io/yq/commands/create#creating-using-a-create-script)
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- [Prefix a path to a yaml file](https://mikefarah.gitbook.io/yq/commands/prefix)
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- [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/usage/convert)
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- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/commands/read#from-stdin)
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- [Merge](https://mikefarah.gitbook.io/yq/commands/merge) multiple yaml files with various options for [overriding](https://mikefarah.gitbook.io/yq/commands/merge#overwrite-values) and [appending](https://mikefarah.gitbook.io/yq/commands/merge#append-values-with-arrays)
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- Supports multiple documents in a single yaml file for [reading](https://mikefarah.gitbook.io/yq/commands/read#multiple-documents), [writing](https://mikefarah.gitbook.io/yq/commands/write-update#multiple-documents) and [merging](https://mikefarah.gitbook.io/yq/commands/merge#multiple-documents)
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## [Usage](https://mikefarah.gitbook.io/yq/)
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Check out the [documentation](https://mikefarah.gitbook.io/yq/) for more detailed and advanced usage.
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```
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Usage:
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yq [flags]
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yq [command]
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Available Commands:
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compare yq x [--prettyPrint/-P] dataA.yaml dataB.yaml 'b.e(name==fr*).value'
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delete yq d [--inplace/-i] [--doc/-d index] sample.yaml 'b.e(name==fred)'
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help Help about any command
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merge yq m [--inplace/-i] [--doc/-d index] [--overwrite/-x] [--append/-a] sample.yaml sample2.yaml
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new yq n [--script/-s script_file] a.b.c newValue
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prefix yq p [--inplace/-i] [--doc/-d index] sample.yaml a.b.c
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read yq r [--printMode/-p pv] sample.yaml 'b.e(name==fr*).value'
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validate yq v sample.yaml
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write yq w [--inplace/-i] [--script/-s script_file] [--doc/-d index] sample.yaml 'b.e(name==fr*).value' newValue
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Flags:
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-h, --help help for yq
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-I, --indent int sets indent level for output (default 2)
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-P, --prettyPrint pretty print
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-j, --tojson output as json. By default it prints a json document in one line, use the prettyPrint flag to print a formatted doc.
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-v, --verbose verbose mode
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-V, --version Print version information and quit
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Use "yq [command] --help" for more information about a command.
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```
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