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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.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<script type="text/x-red" data-template-name="exec">
<div class="form-row">
<label for="node-input-command"><i class="icon-label"></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-label"></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>