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Merge
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Merge
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Overwrite values
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Overwrite values
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Overwrite values with arrays
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<h1>Merge</h1>
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<p>Yaml files can be merged using the 'merge' command. Each additional file merged with the first file will
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set values for any key not existing already or where the key has no value.</p>
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<pre><code>yq m <yaml_file|json_file> <path>...
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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 data1.yaml file of:</p>
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<pre><code class="yaml">a: simple
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b: [1, 2]
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</code></pre>
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<p>and data2.yaml file of:</p>
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<pre><code class="yaml">a: other
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c:
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test: 1
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</code></pre>
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<p>then</p>
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<pre><code class="bash">yq m data1.yaml data2.yaml
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</code></pre>
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<p>will output:</p>
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<pre><code class="yaml">a: simple
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b: [1, 2]
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c:
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test: 1
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</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 data1.yaml file of:</p>
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<pre><code class="yaml">a: simple
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b: [1, 2]
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</code></pre>
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<p>and data2.yaml file of:</p>
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<pre><code class="yaml">a: other
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c:
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test: 1
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</code></pre>
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<p>then</p>
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<pre><code class="bash">yq m -i data1.yaml data2.yaml
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</code></pre>
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<p>will update the data1.yaml file so that the value of 'c' is 'test: 1'.</p>
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<h3 id="overwrite-values">Overwrite values<a class="headerlink" href="#overwrite-values" title="Permanent link">¶</a></h3>
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<p>Given a data1.yaml file of:</p>
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<pre><code class="yaml">a: simple
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b: [1, 2]
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</code></pre>
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<p>and data2.yaml file of:</p>
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<pre><code class="yaml">a: other
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c:
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test: 1
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</code></pre>
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<p>then</p>
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<pre><code class="bash">yq m -x data1.yaml data2.yaml
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</code></pre>
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<p>will output:</p>
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<pre><code class="yaml">a: other
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b: [1, 2]
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c:
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test: 1
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</code></pre>
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<h3 id="overwrite-values-with-arrays">Overwrite values with arrays<a class="headerlink" href="#overwrite-values-with-arrays" title="Permanent link">¶</a></h3>
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<p>Given a data1.yaml file of:</p>
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<pre><code class="yaml">a: simple
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b: [1, 2]
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</code></pre>
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<p>and data3.yaml file of:</p>
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<pre><code class="yaml">b: [2, 3, 4]
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c:
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test: 2
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other: true
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d: false
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</code></pre>
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<p>then</p>
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<pre><code class="bash">yq m -x data1.yaml data3.yaml
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</code></pre>
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<p>will output:</p>
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<pre><code class="yaml">a: simple
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b: [2, 3, 4]
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c:
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test: 2
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other: true
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d: false
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</code></pre>
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<p>Notice that 'b' does not result in the merging of the values within an array. The underlying library does not
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currently handle merging values within an array.</p>
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