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< title > Write/Update - Yq< / title >
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Yq
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Write/Update
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Install
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Read
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Write/Update
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Write/Update
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To Stdout
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From STDIN
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Adding new fields
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< a href = "#appending-value-to-an-array-field" title = "Appending value to an array field" class = "md-nav__link" >
Appending value to an array field
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Updating files in-place
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< li class = "md-nav__item" >
< a href = "#updating-multiple-values-with-a-script" title = "Updating multiple values with a script" class = "md-nav__link" >
Updating multiple values with a script
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Values starting with a hyphen (or dash)
< / a >
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Keys with dots
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Create
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< a href = "../convert/" title = "Convert" class = "md-nav__link" >
Convert
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Merge
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< nav class = "md-nav md-nav--secondary" >
< label class = "md-nav__title" for = "toc" > Table of contents< / label >
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< a href = "#to-stdout" title = "To Stdout" class = "md-nav__link" >
To Stdout
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< a href = "#from-stdin" title = "From STDIN" class = "md-nav__link" >
From STDIN
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< a href = "#adding-new-fields" title = "Adding new fields" class = "md-nav__link" >
Adding new fields
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< / li >
< li class = "md-nav__item" >
< a href = "#appending-value-to-an-array-field" title = "Appending value to an array field" class = "md-nav__link" >
Appending value to an array field
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< / li >
< li class = "md-nav__item" >
< a href = "#updating-files-in-place" title = "Updating files in-place" class = "md-nav__link" >
Updating files in-place
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#updating-multiple-values-with-a-script" title = "Updating multiple values with a script" class = "md-nav__link" >
Updating multiple values with a script
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "#values-starting-with-a-hyphen-or-dash" title = "Values starting with a hyphen (or dash)" class = "md-nav__link" >
Values starting with a hyphen (or dash)
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "#keys-with-dots" title = "Keys with dots" class = "md-nav__link" >
Keys with dots
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< a href = "https://github.com/mikefarah/yq/edit/master/docs/write.md" title = "Edit this page" class = "md-icon md-content__icon" >  < / a >
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< h1 > Write/Update< / h1 >
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< pre > < code > yq w < yaml_file|json_file> < path> < new value>
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< / code > < / pre >
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< p > This command can take a json file as input too, and will output yaml unless specified to export as json (-j)< / p >
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< h3 id = "to-stdout" > To Stdout< a class = "headerlink" href = "#to-stdout" title = "Permanent link" > ¶ < / a > < / h3 >
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< p > Given a sample.yaml file of:< / p >
< pre > < code class = "yaml" > b:
c: 2
< / code > < / pre >
< p > then< / p >
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< pre > < code class = "bash" > yq w sample.yaml b.c cat
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< / code > < / pre >
< p > will output:< / p >
< pre > < code class = "yaml" > b:
c: cat
< / code > < / pre >
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< h3 id = "from-stdin" > From STDIN< a class = "headerlink" href = "#from-stdin" title = "Permanent link" > ¶ < / a > < / h3 >
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< pre > < code class = "bash" > cat sample.yaml | yq w - b.c blah
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< / code > < / pre >
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< h3 id = "adding-new-fields" > Adding new fields< a class = "headerlink" href = "#adding-new-fields" title = "Permanent link" > ¶ < / a > < / h3 >
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< p > Any missing fields in the path will be created on the fly.< / p >
< p > Given a sample.yaml file of:< / p >
< pre > < code class = "yaml" > b:
c: 2
< / code > < / pre >
< p > then< / p >
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< pre > < code class = "bash" > yq w sample.yaml b.d[0] " new thing"
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< / code > < / pre >
< p > will output:< / p >
< pre > < code class = "yaml" > b:
c: cat
d:
- new thing
< / code > < / pre >
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< h3 id = "appending-value-to-an-array-field" > Appending value to an array field< a class = "headerlink" href = "#appending-value-to-an-array-field" title = "Permanent link" > ¶ < / a > < / h3 >
< p > Given a sample.yaml file of:< / p >
< pre > < code class = "yaml" > b:
c: 2
d:
- new thing
- foo thing
< / code > < / pre >
< p > then< / p >
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< pre > < code class = "bash" > yq w sample.yaml b.d[+] " bar thing"
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< / code > < / pre >
< p > will output:< / p >
< pre > < code class = "yaml" > b:
c: cat
d:
- new thing
- foo thing
- bar thing
< / code > < / pre >
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< h3 id = "updating-files-in-place" > Updating files in-place< a class = "headerlink" href = "#updating-files-in-place" title = "Permanent link" > ¶ < / a > < / h3 >
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< p > Given a sample.yaml file of:< / p >
< pre > < code class = "yaml" > b:
c: 2
< / code > < / pre >
< p > then< / p >
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< pre > < code class = "bash" > yq w -i sample.yaml b.c cat
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< / code > < / pre >
< p > will update the sample.yaml file so that the value of 'c' is cat.< / p >
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< h3 id = "updating-multiple-values-with-a-script" > Updating multiple values with a script< a class = "headerlink" href = "#updating-multiple-values-with-a-script" title = "Permanent link" > ¶ < / a > < / h3 >
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< p > Given a sample.yaml file of:< / p >
< pre > < code class = "yaml" > b:
c: 2
e:
- name: Billy Bob
< / code > < / pre >
< p > and a script update_instructions.yaml of:< / p >
< pre > < code class = "yaml" > b.c: 3
b.e[0].name: Howdy Partner
< / code > < / pre >
< p > then< / p >
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< pre > < code class = "bash" > yq w -s update_instructions.yaml sample.yaml
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< / code > < / pre >
< p > will output:< / p >
< pre > < code class = "yaml" > b:
c: 3
e:
- name: Howdy Partner
< / code > < / pre >
< p > And, of course, you can pipe the instructions in using '-':< / p >
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< pre > < code class = "bash" > cat update_instructions.yaml | yq w -s - sample.yaml
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< / code > < / pre >
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< h3 id = "values-starting-with-a-hyphen-or-dash" > Values starting with a hyphen (or dash)< a class = "headerlink" href = "#values-starting-with-a-hyphen-or-dash" title = "Permanent link" > ¶ < / a > < / h3 >
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< p > The flag terminator needs to be used to stop the app from attempting to parse the subsequent arguments as flags:< / p >
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< pre > < code > yq w -- my.path -3
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< / code > < / pre >
< p > will output< / p >
< pre > < code class = "yaml" > my:
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path: -3
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< / code > < / pre >
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< h3 id = "keys-with-dots" > Keys with dots< a class = "headerlink" href = "#keys-with-dots" title = "Permanent link" > ¶ < / a > < / h3 >
< p > When specifying a key that has a dot use key lookup indicator.< / p >
< pre > < code class = "yaml" > b:
foo.bar: 7
< / code > < / pre >
< pre > < code class = "bash" > yaml r sample.yaml b[foo.bar]
< / code > < / pre >
< pre > < code class = "bash" > yaml w sample.yaml b[foo.bar] 9
< / code > < / pre >
< p > Any valid yaml key can be specified as part of a key lookup.< / p >
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< / div >
< / a >
< a href = "../create/" title = "Create" class = "md-flex md-footer-nav__link md-footer-nav__link--next" rel = "next" >
< div class = "md-flex__cell md-flex__cell--stretch md-footer-nav__title" >
< span class = "md-flex__ellipsis" >
< span class = "md-footer-nav__direction" >
Next
< / span >
Create
< / span >
< / div >
< div class = "md-flex__cell md-flex__cell--shrink" >
< i class = "md-icon md-icon--arrow-forward md-footer-nav__button" > < / i >
< / div >
< / a >
< / nav >
< / div >
< div class = "md-footer-meta md-typeset" >
< div class = "md-footer-meta__inner md-grid" >
< div class = "md-footer-copyright" >
powered by
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< a href = "http://www.mkdocs.org" > MkDocs< / a >
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and
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< a href = "https://squidfunk.github.io/mkdocs-material/" >
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Material for MkDocs< / a >
< / div >
< div class = "md-footer-social" >
< link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" >
< a href = "https://github.com/mikefarah" class = "md-footer-social__link fa fa-github" > < / a >
< a href = "https://www.linkedin.com/in/mike-farah-b5a75b2/" class = "md-footer-social__link fa fa-linkedin" > < / a >
< / div >
< / div >
< / div >
< / footer >
< / div >
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< script src = "../assets/javascripts/application.6cdc17f0.js" > < / script >
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< script > app . initialize ( { version : "0.17.2" , url : { base : ".." } } ) < / script >
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< / body >
< / html >
