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node-red/nodes/core/core/75-exec.html

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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
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<script type="text/x-red" data-template-name="exec">
<div class="form-row">
<label for="node-input-command"><i class="fa fa-file"></i> <span data-i18n="exec.label.command"></span></label>
<input type="text" id="node-input-command" data-i18n="[placeholder]exec.label.command">
</div>
<div class="form-row">
<label><i class="fa fa-plus"></i> <span data-i18n="exec.label.append"></span></label>
<input type="checkbox" id="node-input-addpay" style="display: inline-block; width: auto; vertical-align: top;">
&nbsp;msg.payload
</div>
<div class="form-row">
<label for="node-input-append"> </label>
<input type="text" id="node-input-append" data-i18n="[placeholder]exec.placeholder.extraparams">
</div>
<div class="form-row">
<label>&nbsp;</label>
<input type="checkbox" id="node-input-useSpawn" placeholder="spawn" style="display: inline-block; width: auto; vertical-align: top;">
<label for="node-input-useSpawn" style="width:70%;"><span data-i18n="exec.spawn"></span></label>
</div>
<div class="form-row">
<label for="node-input-timer"><i class="fa fa-clock-o"></i> <span data-i18n="exec.label.timeout"></span></label>
<input type="text" id="node-input-timer" style="width:65px;" data-i18n="[placeholder]exec.label.timeoutplace"> seconds
</div>
<div class="form-row">
<label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="common.label.name"></span></label>
<input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name">
</div>
</script>
<script type="text/x-red" data-help-name="exec">
<p>Calls out to a system command.<br/></p>
<p>Provides 3 outputs: stdout, stderr, and return code.</p>
<p>By default uses the <code>exec</code> system call which calls the command, then gets a callback
on completion, returning the complete result in one message, along with any errors.</p>
<p>Optionally can use <code>spawn</code> instead, which returns the output from stdout and stderr
as the command runs (usually one line at a time). On completion it then returns a return code
(on the 3rd output).</p>
<p>The optional append gets added to the command after <code>msg.payload</code> - so you can do
things like pipe the result to another command.</p>
<p>Parameters with spaces should be enclosed in quotes - <i>"This is a single parameter"</i></p>
<p>If stdout is binary a <i>buffer</i> is returned - otherwise returns a <i>string</i>.</p>
<p>The blue status icon will be visible while the node is active.</p>
<p>If running a Python app you may need to use the <code>-u</code> parameter to stop the output being buffered.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('exec',{
category: 'advanced-function',
color:"darksalmon",
defaults: {
command: {value:"",required:true},
addpay: {value:true},
append: {value:""},
useSpawn: {value:""},
timer: {value:""},
name: {value:""}
},
inputs:1,
outputs:3,
icon: "arrow-in.png",
align: "right",
label: function() {
return this.name||this.command;
},
labelStyle: function() {
return this.name?"node_label_italic":"";
}
});
</script>