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< title > Write/Update - Yq< / title >
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< label class = "md-overlay" data-md-component = "overlay" for = "__drawer" > < / label >
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Skip to content
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< a href = ".." title = "Yq" class = "md-header-nav__button md-logo" >
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< / a >
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< / div >
< div class = "md-flex__cell md-flex__cell--shrink" >
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< label class = "md-icon md-icon--menu md-header-nav__button" for = "__drawer" > < / label >
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< div class = "md-flex__cell md-flex__cell--stretch" >
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< span class = "md-header-nav__topic" >
Yq
< / span >
< span class = "md-header-nav__topic" >
Write/Update
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< div class = "md-flex__cell md-flex__cell--shrink" >
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< label class = "md-icon md-icon--search md-header-nav__button" for = "__search" > < / label >
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< label class = "md-icon md-search__icon" for = "__search" > < / label >
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
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Type to start searching
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mikefarah/yq
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< span class = "md-nav__button md-logo" >
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< i class = "md-icon" > < / i >
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< / span >
Yq
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< / label >
< div class = "md-nav__source" >
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< a href = "https://github.com/mikefarah/yq/" title = "Go to repository" class = "md-source" data-md-source = "github" >
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< div class = "md-source__repository" >
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mikefarah/yq
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< / div >
< / a >
< / div >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = ".." title = "Install" class = "md-nav__link" >
Install
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../read/" title = "Read" class = "md-nav__link" >
Read
< / a >
< / li >
< li class = "md-nav__item md-nav__item--active" >
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< input class = "md-toggle md-nav__toggle" data-md-toggle = "toc" type = "checkbox" id = "__toc" >
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< label class = "md-nav__link md-nav__link--active" for = "__toc" >
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Write/Update
< / label >
< a href = "./" title = "Write/Update" class = "md-nav__link md-nav__link--active" >
Write/Update
< / a >
< nav class = "md-nav md-nav--secondary" >
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< label class = "md-nav__title" for = "__toc" > Table of contents< / label >
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< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#to-stdout" title = "To Stdout" class = "md-nav__link" >
To Stdout
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#from-stdin" title = "From STDIN" class = "md-nav__link" >
From STDIN
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#adding-new-fields" title = "Adding new fields" class = "md-nav__link" >
Adding new fields
< / a >
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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
< / a >
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< / li >
< li class = "md-nav__item" >
< a href = "#multiple-documents-update-a-single-document" title = "Multiple Documents - update a single document" class = "md-nav__link" >
Multiple Documents - update a single document
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#multiple-documents-update-all-documents" title = "Multiple Documents - update all documents" class = "md-nav__link" >
Multiple Documents - update all documents
< / a >
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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
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../delete/" title = "Delete" class = "md-nav__link" >
Delete
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../create/" title = "Create" class = "md-nav__link" >
Create
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../convert/" title = "Convert" class = "md-nav__link" >
Convert
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../merge/" title = "Merge" class = "md-nav__link" >
Merge
< / a >
< / li >
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< / ul >
< / nav >
< / div >
< / div >
< / div >
< div class = "md-sidebar md-sidebar--secondary" data-md-component = "toc" >
< div class = "md-sidebar__scrollwrap" >
< div class = "md-sidebar__inner" >
< nav class = "md-nav md-nav--secondary" >
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< label class = "md-nav__title" for = "__toc" > Table of contents< / label >
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< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#to-stdout" title = "To Stdout" class = "md-nav__link" >
To Stdout
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#from-stdin" title = "From STDIN" class = "md-nav__link" >
From STDIN
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#adding-new-fields" title = "Adding new fields" class = "md-nav__link" >
Adding new fields
< / a >
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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
< / a >
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< / li >
< li class = "md-nav__item" >
< a href = "#multiple-documents-update-a-single-document" title = "Multiple Documents - update a single document" class = "md-nav__link" >
Multiple Documents - update a single document
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#multiple-documents-update-all-documents" title = "Multiple Documents - update all documents" class = "md-nav__link" >
Multiple Documents - update all documents
< / a >
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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
< / a >
< / li >
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< / ul >
< / nav >
< / div >
< / div >
< / div >
< div class = "md-content" >
< article class = "md-content__inner md-typeset" >
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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> < path> < new value>
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< / code > < / pre >
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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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< p > Note that the path is in quotes to avoid the square brackets being interpreted by your shell.< / p >
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< h3 id = "multiple-documents-update-a-single-document" > Multiple Documents - update a single document< a class = "headerlink" href = "#multiple-documents-update-a-single-document" title = "Permanent link" > ¶ < / a > < / h3 >
< p > Given a sample.yaml file of:< / p >
< pre > < code class = "yaml" > something: else
---
b:
c: 2
< / code > < / pre >
< p > then< / p >
< pre > < code class = "bash" > yq w -d1 sample.yaml b.c 5
< / code > < / pre >
< p > will output:< / p >
< pre > < code class = "yaml" > something: else
---
b:
c: 5
< / code > < / pre >
< h3 id = "multiple-documents-update-all-documents" > Multiple Documents - update all documents< a class = "headerlink" href = "#multiple-documents-update-all-documents" title = "Permanent link" > ¶ < / a > < / h3 >
< p > Given a sample.yaml file of:< / p >
< pre > < code class = "yaml" > something: else
---
b:
c: 2
< / code > < / pre >
< p > then< / p >
< pre > < code class = "bash" > yq w -d'*' sample.yaml b.c 5
< / code > < / pre >
< p > will output:< / p >
< pre > < code class = "yaml" > something: else
b:
c: 5
---
b:
c: 5
< / code > < / pre >
< p > Note that '*' is in quotes to avoid being interpreted by your shell.< / p >
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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 >
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< pre > < code class = "bash" > yaml r sample.yaml 'b[foo.bar]'
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< / code > < / pre >
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< pre > < code class = "bash" > yaml w sample.yaml 'b[foo.bar]' 9
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< / code > < / pre >
< p > Any valid yaml key can be specified as part of a key lookup.< / p >
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< p > Note that the path is in quotes to avoid the square brackets being interpreted by your shell.< / p >
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< footer class = "md-footer" >
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< nav class = "md-footer-nav__inner md-grid" >
< a href = "../read/" title = "Read" class = "md-flex md-footer-nav__link md-footer-nav__link--prev" rel = "prev" >
< div class = "md-flex__cell md-flex__cell--shrink" >
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< div class = "md-footer-copyright" >
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and
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< a href = "https://squidfunk.github.io/mkdocs-material/" >
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< div class = "md-footer-social" >
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< script > app . initialize ( { version : "0.17.5" , url : { base : ".." } } ) < / script >
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