Added code sample/snippet for spawning child processes to capture stdout

snippets/shelltest.js

@@ -0,0 +1,45 @@
+/*
+Copyright 2022 Intel Corporation
+@author Bryan Roe
+
+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.
+*/
+
+
+//
+// This code snippet illustrates how to capture stdout from a child process
+//
+
+var child;
+if (process.platform == 'win32')
+{
+    //                                                                             vvv   In this sample, we are simply going to spawn a command shell
+    child = require('child_process').execFile(process.env['windir'] + '\\system32\\cmd.exe', ['/C dir']);
+    //                                                                                         ^^^ This simply tells cmd.exe to to a dir, and then exit
+    //                                                     ^^^  This gets the environment variable for the Windows Folder location
+}
+else
+{
+    child = require('child_process').execFile('/bin/ls', ['ls', '-la']);
+    //                                         ^^^ On POSIX, we are simply just going to directly spawn 'ls'
+}
+
+
+child.stdout.str = ''; // Initialize an empty string, so we can append stdout to it
+child.stdout.on('data', function (c) { this.str += c.toString(); }); // Just append to our stdout string
+
+child.waitExit();  // This will wait until the child exits, allowing it to execute and run any event handlers
+
+console.log(child.stdout.str);
+process.exit();
+