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<h1 id="g-code-shell-command-extension">G-Code Shell Command Extension</h1>
<h3 id="creator-of-this-extension-is-arksine">Creator of this extension is <a href="https://github.com/Arksine">Arksine</a>.</h3>
<p>This is a brief explanation of how to use the shell command extension for Klipper, which you can install with KIAUH.</p>
<p>After installing the extension you can execute linux commands or even scripts from within Klipper with custom commands defined in your printer.cfg.</p>
<h4 id="how-to-configure-a-shell-command">How to configure a shell command:</h4>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1"># Runs a linux command or script from within klipper. Note that sudo commands</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="c1"># that require password authentication are disallowed. All executable scripts</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="c1"># should include a shebang.</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="c1"># [gcode_shell_command my_shell_cmd]</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="c1">#command:</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="c1"># The linux shell command/script to be executed. This parameter must be</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="c1"># provided</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="c1">#timeout: 2.</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="c1"># The timeout in seconds until the command is forcably terminated. Default</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="c1"># is 2 seconds.</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="c1">#verbose: True</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="c1"># If enabled, the command&#39;s output will be forwarded to the terminal. Its</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="c1"># recommended to set this to false for commands that my run in quick</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="c1"># succession. Default is True.</span>
</code></pre></div>
<p>Once you have set up a shell command with the given parameters from above in your printer.cfg you can run the command as follows:
<code>RUN_SHELL_COMMAND CMD=name</code></p>
<p>Example:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>[gcode_shell_command hello_world]
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>command: echo hello world
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>timeout: 2.
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>verbose: True
</code></pre></div>
<p>Execute with:
<code>RUN_SHELL_COMMAND CMD=hello_world</code></p>
<h3 id="passing-parameters">Passing parameters:</h3>
<p>As of commit <a href="https://github.com/dw-0/kiauh/commit/f231fa9c69191f23277b4e3319f6b675bfa0ee42">f231fa9</a> it is also possible to pass optional parameters to a <code>gcode_shell_command</code>.
The following short example shows storing the extruder temperature into a variable, passing that value with a parameter to a <code>gcode_shell_command</code>, which then,
once the gcode_macro runs and the gcode_shell_command gets called, executes the <code>script.sh</code>. The script then echoes a message to the console (if <code>verbose: True</code>)
and writes the value of the parameter into a textfile called <code>test.txt</code> located in the home directory.</p>
<p>Content of the <code>gcode_shell_command</code> and the <code>gcode_macro</code>:
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>[gcode_shell_command print_to_file]
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>command: sh /home/pi/klipper_config/script.sh
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>timeout: 30.
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>verbose: True
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a>[gcode_macro GET_TEMP]
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>gcode:
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> {% set temp = printer.extruder.temperature %}
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> { action_respond_info(&quot;%s&quot; % (temp)) }
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a> RUN_SHELL_COMMAND CMD=print_to_file PARAMS={temp}
</code></pre></div></p>
<p>Content of <code>script.sh</code>:
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="ch">#!/bin/sh</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;temp is: </span><span class="nv">$1</span><span class="s2">&quot;</span>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;</span><span class="nv">$1</span><span class="s2">&quot;</span><span class="w"> </span>&gt;&gt;<span class="w"> </span><span class="s2">&quot;</span><span class="si">${</span><span class="nv">HOME</span><span class="si">}</span><span class="s2">/test.txt&quot;</span>
</code></pre></div></p>
<h2 id="warning">Warning</h2>
<p>This extension may have a high potential for abuse if not used carefully! Also, depending on the command you execute, high system loads may occur and can cause system instabilities.
Use this extension at your own risk and only if you know what you are doing!</p>
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