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Write/Update
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Adding new fields
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Appending value to an array field
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Updating files in-place
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Updating multiple values with a script
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Values starting with a hyphen (or dash)
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Adding new fields
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Appending value to an array field
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Updating files in-place
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Updating multiple values with a script
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Values starting with a hyphen (or dash)
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<h1>Write/Update</h1>
<pre><code>yq w &lt;yaml_file|json_file&gt; &lt;path&gt; &lt;new value&gt;
</code></pre>
<p>This command can take a json file as input too, and will output yaml unless specified to export as json (-j)</p>
<h3 id="to-stdout">To Stdout<a class="headerlink" href="#to-stdout" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">b:
c: 2
</code></pre>
<p>then</p>
<pre><code class="bash">yq w sample.yaml b.c cat
</code></pre>
<p>will output:</p>
<pre><code class="yaml">b:
c: cat
</code></pre>
<h3 id="from-stdin">From STDIN<a class="headerlink" href="#from-stdin" title="Permanent link">&para;</a></h3>
<pre><code class="bash">cat sample.yaml | yq w - b.c blah
</code></pre>
<h3 id="adding-new-fields">Adding new fields<a class="headerlink" href="#adding-new-fields" title="Permanent link">&para;</a></h3>
<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>
<pre><code class="bash">yq w sample.yaml b.d[0] &quot;new thing&quot;
</code></pre>
<p>will output:</p>
<pre><code class="yaml">b:
c: cat
d:
- new thing
</code></pre>
<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">&para;</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>
<pre><code class="bash">yq w sample.yaml b.d[+] &quot;bar thing&quot;
</code></pre>
<p>will output:</p>
<pre><code class="yaml">b:
c: cat
d:
- new thing
- foo thing
- bar thing
</code></pre>
<h3 id="updating-files-in-place">Updating files in-place<a class="headerlink" href="#updating-files-in-place" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">b:
c: 2
</code></pre>
<p>then</p>
<pre><code class="bash">yq w -i sample.yaml b.c cat
</code></pre>
<p>will update the sample.yaml file so that the value of 'c' is cat.</p>
<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">&para;</a></h3>
<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>
<pre><code class="bash">yq w -s update_instructions.yaml sample.yaml
</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>
<pre><code class="bash">cat update_instructions.yaml | yq w -s - sample.yaml
</code></pre>
<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">&para;</a></h3>
<p>The flag terminator needs to be used to stop the app from attempting to parse the subsequent arguments as flags:</p>
<pre><code>yq w -- my.path -3
</code></pre>
<p>will output</p>
<pre><code class="yaml">my:
path: -3
</code></pre>
<h3 id="keys-with-dots">Keys with dots<a class="headerlink" href="#keys-with-dots" title="Permanent link">&para;</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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