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

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<!--
Copyright 2013 IBM Corp.
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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<script type="text/x-red" data-template-name="exec">
<div class="form-row">
<label for="node-input-command"><i class="icon-file"></i> Command</label>
<input type="text" id="node-input-command" placeholder="command">
</div>
<div class="form-row">
<label for="node-input-append"><i class="icon-list"></i> Append</label>
<input type="text" id="node-input-append" placeholder="extra input">
</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%;">Use spawn() instead of exec() ?</label>
</div>
<div class="form-row">
<label for="node-input-name"><i class="icon-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
</script>
<script type="text/x-red" data-help-name="exec">
<p>Call to a system command.<br/>This can be very dangerous...</p>
<p>Provides 3 outputs... stdout, stderr, and return code.</p>
<p>By default uses exec() which calls the command, waits for completion and then returns the complete result in one go. Along with any errors.</p>
<p>Optionally can use spawn() instead, which returns output from stdout and stderr as the command runs (ie one line at a time). On completion then returns a return code (on the 3rd output).</p>
<p>The optional append gets added to the command after the <b>msg.payload</b> (so you can do things like pipe etc.)</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('exec',{
category: 'advanced-function',
color:"darksalmon",
defaults: {
command: {value:"",required:true},
append: {value:""},
useSpawn: {value:""},
name: {value:""}
},
inputs:1,
outputs:3,
icon: "arrow-in.png",
align: "right",
label: function() {
return this.name||this.command;
}
});
</script>