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Multiple Documents - read all documents
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Multiple Documents - read all documents
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<h1>Read</h1>
<pre><code>yq r &lt;yaml_file|json_file&gt; &lt;path&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="basic">Basic<a class="headerlink" href="#basic" 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 r sample.yaml b.c
</code></pre>
<p>will output the value of '2'.</p>
<h3 id="from-stdin">From Stdin<a class="headerlink" href="#from-stdin" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="bash">cat sample.yaml | yq r - b.c
</code></pre>
<p>will output the value of '2'.</p>
<h3 id="splat">Splat<a class="headerlink" href="#splat" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">---
bob:
item1:
cats: bananas
item2:
cats: apples
thing:
cats: oranges
</code></pre>
<p>then</p>
<pre><code class="bash">yq r sample.yaml bob.*.cats
</code></pre>
<p>will output</p>
<pre><code class="yaml">- bananas
- apples
- oranges
</code></pre>
<h3 id="prefix-splat">Prefix Splat<a class="headerlink" href="#prefix-splat" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">---
bob:
item1:
cats: bananas
item2:
cats: apples
thing:
cats: oranges
</code></pre>
<p>then</p>
<pre><code class="bash">yq r sample.yaml bob.item*.cats
</code></pre>
<p>will output</p>
<pre><code class="yaml">- bananas
- apples
</code></pre>
<h3 id="multiple-documents-specify-a-single-document">Multiple Documents - specify a single document<a class="headerlink" href="#multiple-documents-specify-a-single-document" title="Permanent link">&para;</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 r -d1 sample.yaml b.c
</code></pre>
<p>will output the value of '2'.</p>
<h3 id="multiple-documents-read-all-documents">Multiple Documents - read all documents<a class="headerlink" href="#multiple-documents-read-all-documents" title="Permanent link">&para;</a></h3>
<p>Reading all documents will return the result as an array. This can be converted to json using the '-j' flag if desired.</p>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">name: Fred
age: 22
---
name: Stella
age: 23
---
name: Android
age: 232
</code></pre>
<p>then</p>
<pre><code class="bash">yq r -d'*' sample.yaml name
</code></pre>
<p>will output:</p>
<pre><code>- Fred
- Stella
- Android
</code></pre>
<h3 id="arrays">Arrays<a class="headerlink" href="#arrays" title="Permanent link">&para;</a></h3>
<p>You can give an index to access a specific element:
e.g.: given a sample file of</p>
<pre><code class="yaml">b:
e:
- name: fred
value: 3
- name: sam
value: 4
</code></pre>
<p>then</p>
<pre><code>yq r sample.yaml 'b.e[1].name'
</code></pre>
<p>will output 'sam'</p>
<p>Note that the path is in quotes to avoid the square brackets being interpreted by your shell.</p>
<h3 id="array-splat">Array Splat<a class="headerlink" href="#array-splat" title="Permanent link">&para;</a></h3>
<p>e.g.: given a sample file of</p>
<pre><code class="yaml">b:
e:
- name: fred
value: 3
- name: sam
value: 4
</code></pre>
<p>then</p>
<pre><code>yq r sample.yaml 'b.e[*].name'
</code></pre>
<p>will output:</p>
<pre><code>- fred
- sam
</code></pre>
<p>Note that the path is in quotes to avoid the square brackets being interpreted by your shell.</p>
<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>
<p>Note that the path is in quotes to avoid the square brackets being interpreted by your shell.</p>
<h3 id="keys-and-values-with-leading-dashes">Keys (and values) with leading dashes<a class="headerlink" href="#keys-and-values-with-leading-dashes" title="Permanent link">&para;</a></h3>
<p>If a key or value has leading dashes, yq won't know that you are passing a value as opposed to a flag (and you will get a 'bad flag syntax' error).</p>
<p>To fix that, you will need to tell it to stop processing flags by adding '--' after the last flag like so:</p>
<pre><code class="bash">yq n -t -- --key --value
</code></pre>
<p>Will result in</p>
<p><code>`
--key: --value</code></p>
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