Jq yaml

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It only takes a minute to sign up. Now I need to add some content via shell script on an ubuntu server. I am not quite sure if it is possible at all:.

There are a number of yaml libraries for Perl, Python etc. Another option is to install a command-line yaml processorand call it from your shell script. It's based on python. This would be the syntax for your example:. Since the reason you want to do this is to modify a docker-compose file, another alternative is to use a JSON file.

Docker-compose now supports JSON files. Support for command-line manipulation of JSONs is already very good ex: jq. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Is it possible to modify a yml file via shell script? Ask Question. Asked 3 years, 2 months ago. Active 1 year, 11 months ago. Viewed 27k times. This is how my docker-compose. Shell provides you very powerful scripting language. You can easily write a script using sedawk and regular expressions to update your file.

Could you please provide a little example? While this is technically possible using shell, you are must better off using a language that has an actual yaml library. I would advise you to check out the ruamel. I think it's worth noting that links is a legacy feature which will be removed from docker in the future: docs.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. The plan is to have multiple parser options at some point. But only JSON data types null, boolean, string, number, array, object will ever be supported. No NaNs, no infinities, no non-string keys, no difference between tuples and arrays, only null, booleans, numbers, strings, arrays, and objects. Changing this would require a ton of work and might require deep changes to the language.

One feature request I'd like to make if it isn't already covered by an existing "issue" is what I'll call the "Farewell to awk" flag -- an option to read in a UTF8 file as a sequence of JSON strings, one string per line.

Is that covered elsewhere? This would definitely be useful. Is this something you're planning to work on in the near future? If not, is it something that's feasible for a newcomer to the project to work on? I should add that while supporting type annotations on input is not unreasonable, jq will not support "date" or other such types internally, therefore also not on output though an output module could use schema to insert type annotations.

Ideally all such parsers and encoders could be written in jq itself. We'll need a byte at a time raw input mode for that :. The script is implemented in bash and will use a locally installed version of jq and python if they are on the path or delegate to a docker container containing the same otherwise.

Transforming yaml to json will lose something - references I added a link to y2j in the wiki. I wrote my own jq wrapper supporting YAML input and output. To use it clone the repository jqt and run make install. The script tries to imitate at maximum the jq command line interface, showing help for example and not requiring redirection of input:. Because it has so few dependencies it is much more preferable to other tools that need Python, Lua, Perl or similar.

Unless a feature json doesn't support is needed like refs or multiple documents per stream then jq output will syntactically work with any tool that takes yaml as input.

jq yaml

If there is need for a feature json doesn't support then just outputting in block style yaml will have the same issues. There is value in a tool like jq or jq itself that actually supports all the features of yaml, but it really is only in cases where actual features of yaml that json can't support are really needed. Definitely limited use, but not completely zero. One could also use this tool that is written in Golang if one does not want to install pip.

Might someone write and contribute a fromyaml not unlike the fromcsv in ? That'd be great. I just released yjq with similar functionality.

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It is available in Homebrew as python-yq. Thanks, kislyukit is a good idea to wrap the solution. JQ is much ahead of any yaml processor solution. For ci, I will still prefer to use mikefarah solution that is one single binary avoiding the need of bake python inside a docker.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I need to do yaml validation and avoid duplicate entry also.

Input is yaml file imported received form user.

jq yaml

Learn more. How to convert yaml file to json using jquery?

The jq Cookbook

Ask Question. Asked 4 years, 11 months ago. Active 4 years, 11 months ago. Viewed 1k times. Kindly some one help me to resolve this?

Pay no attention to the man behind the curtain. Jeremy W 1, 6 6 gold badges 22 22 silver badges 31 31 bronze badges. Murugesan Era Murugesan Era 1 1 silver badge 14 14 bronze badges. What does a DOM manipulation library have to do with a yaml file? It doesn't know yamlit can only import your file using Ajax.

You need to use another tool. The above npm package looks promising. Here is a related question: stackoverflow. Active Oldest Votes.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Before using yqyou also have to install its dependency, jq.

See the jq installation instructions for details and directions specific to your platform. On macOS, yq is also available on Homebrew : use brew install python-yq. By default, no conversion of jq output is done.

Mapping key order is preserved. By default, custom YAML tags and styles in the input are ignored. All other command line arguments are forwarded to jq. See the jq manual for more details on jq features and options. The -Y option helps preserve custom string styles and tags in your document.

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Passing this document through yq -y. ElasticLoadBalancer will drop custom tags, such as! Refand styles, such as the folded style of the Description field:. By contrast, passing it through yq -Y. ElasticLoadBalancer will preserve tags and styles:. To accomplish this in -Y mode, yq carries extra metadata mapping pairs and sequence values in the JSON representation of your document for any custom tags or styles that it finds.

The -Y option is incompatible with jq filters that do not expect the extra information injected into the document to preserve the YAML formatting. For example, a jq filter that counts entries in the Instances array will come up with 4 entries instead of 2. A filter that expects all array entries to be mappings may break due to the presence of string metadata keys. This package's release series available on PyPI begins with version 2. Versions of yq prior to 2. This package follows the Semantic Versioning 2.

To ensure proper operation, declare dependency version ranges according to SemVer. Please report bugs, issues, feature requests, etc. Licensed under the terms of the Apache License, Version 2.

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Thanks for letting us know this page needs work. We're sorry we let you down. If you've got a moment, please tell us how we can make the documentation better. This can be useful to pass the output to a text processor, like grepsedor awk. It typically presents the information in a "human-friendly" format that is much easier to read than the others, but not as programmatically useful.

As explained in the configuration topic, you can specify the output format in three ways:. Using the output option in a named profile in the config file — The following example sets the default output format to text. Using this environment variable overrides any value set in the config file. Using the --output option on the command line — The following example sets the output of only this one command to json.

Using this option on the command overrides any currently set environment variable or the value in the config file. You can customize and filter the results in any format by using the --query parameter. For more information, see How to Filter the Output with the --query Option. Most programming languages can easily decode JSON strings using built-in functions or with publicly available libraries.

For more advanced filtering that you might not be able to do with --queryyou can consider jqa command line JSON processor. For more advanced filtering that you might not be able to do with --queryyou can consider yqa command line YAML processor. It works well with traditional Unix text tools such as grepsedand awkand the text processing performed by PowerShell. The text output format follows the basic structure shown below. The columns are sorted alphabetically by the corresponding key names of the underlying JSON object.

The following is an example of text output. Each field is tab separated from the others, with an extra tab where there is an empty field. The fourth column is the PasswordLastUsed field, and is empty for the last two entries because those users never sign in to the AWS Management Console. We strongly recommend that if you specify text output, you also always use the --query option to ensure consistent behavior.

This is because the text format alphabetically orders output columns by the key name of the underlying JSON object returned by the AWS service, and similar resources might not have the same key names. Also, resources might have key-value elements added or removed in future updates, altering the column ordering. This is where --query augments the functionality of the text output to provide you with complete control over the output format. In the following example, the command specifies which elements to display and defines the ordering of the columns with the list notation [key1, key2, This gives you full confidence that the correct key values are always displayed in the expected column.

The following example shows how you can use grep and awk with the text output from the aws ec2 describe-instances command. The first command displays the Availability Zone, current state, and the instance ID of each instance in text output. The second command processes that output to display only the instance IDs of all running instances in the us-west-2a Availability Zone.

The following example goes a step further and shows not only how to filter the output, but how to use that output to automate changing instance types for each stopped instance. The text output can also be useful in PowerShell.

jq Manual (development version)

The following command displays the value of the third column InstanceId if the first column AvailabilityZone matches the string us-west-2a.

Notice that although the previous example does show how to use the --query parameter to parse the underlying JSON objects and pull out the desired column, PowerShell has its own ability to handle JSON, if cross-platform compatibility isn't a concern.

Instead of handling the output as text, as most command shells require, PowerShell lets you use the ConvertFrom-JSON cmdlet to produce a hierarchically structured object. You can then directly access the member you want from that object. If you output text, and filter the output to a single field using the --query parameter, the output is a single line of tab-separated values.

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To get each value onto a separate line, you can put the output field in brackets, as shown in the following examples. You can combine the --query option with the table format to display a set of elements preselected from the raw output.For released versions, see jq 1.

A jq program is a "filter": it takes an input, and produces an output. There are a lot of builtin filters for extracting a particular field of an object, or converting a number to a string, or various other standard tasks.

jq yaml

Filters can be combined in various ways - you can pipe the output of one filter into another filter, or collect the output of a filter into an array. Some filters produce multiple results, for instance there's one that produces all the elements of its input array. Piping that filter into a second runs the second filter for each element of the array.

Generally, things that would be done with loops and iteration in other languages are just done by gluing filters together in jq. It's important to remember that every filter has an input and an output. Even literals like "hello" or 42 are filters - they take an input but always produce the same literal as output. Operations that combine two filters, like addition, generally feed the same input to both and combine the results. The input to jq is parsed as a sequence of whitespace-separated JSON values which are passed through the provided filter one at a time.

The output s of the filter are written to standard out, again as a sequence of whitespace-separated JSON data. Note: it is important to mind the shell's quoting rules. As a general rule it's best to always quote with single-quote characters the jq program, as too many characters with special meaning to jq are also shell meta-characters. For example, jq "foo" will fail on most Unix shells because that will be the same as jq foowhich will generally fail because foo is not defined.

When using the Windows command shell cmd. This mode also parses the output of jq without the --seq option. Parse the input in streaming fashion, outputting arrays of path and leaf values scalars and empty arrays or empty objects. For example, "a" becomes [[],"a"]and [[],"a",["b"]] becomes [[0],[]][[1],"a"]and [[1,0],"b"]. This is useful for processing very large inputs. Use this in conjunction with filtering and the reduce and foreach syntax to reduce large inputs incrementally.

Instead of running the filter for each JSON object in the input, read the entire input stream into a large array and run the filter just once. Don't parse the input as JSON. Instead, each line of text is passed to the filter as a string. If combined with --slurpthen the entire input is passed to the filter as a single long string. Don't read any input at all! Instead, the filter is run once using null as the input.

This is useful when using jq as a simple calculator or to construct JSON data from scratch. By default, jq pretty-prints JSON output. Using this option will result in more compact output by instead putting each JSON object on a single line.This is an ICU 1.

Install using sudo apt-get install jq. Install using sudo dnf install jq.

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Install using sudo zypper install jq. Install using sudo pacman -S jq. Use Homebrew to install jq 1. Use MacPorts to install jq 1. Use Chocolatey NuGet to install jq 1. SHA checksums are provided for all release and pre-release binaries.

The checksums for jq 1. Additionally, all binaries are signed by the jq Package Signing Key. The signatures for jq 1. You can use GnuPG to verify a signature by downloading the signature and running gpg --verify signature. You can build it using the usual. For Linux systems, these will all be in your system's package manager, and if you do development on the machine they're most likely already installed. However, you may find that you need a newer version of Bison than the one provided by Apple.

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This can be found in Homebrew or MacPorts. The --disable-maintainer-mode flag says to use the pre-generated lexer and parser that come with the code.

To compile the lexer and parser also from source, leave out this flag. You will need to install Flex and Bison. The man page is built by make jq. Toggle navigation jq. Download jq jq is written in C and has no runtime dependencies, so it should be possible to build it for nearly any platform. Linux jq 1. OS X Use Homebrew to install jq 1. FreeBSD pkg install jq as root installs a pre-built binary package. Windows Use Chocolatey NuGet to install jq 1.


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