Create shelljs.js

npm_Modules/ShellJs/README.md

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+## ShellJs Module
+
+`ShellJS` is an npm module that provides portable Unix shell commands for `Node.js`. It allows you to execute shell commands within your Node.js applications, 
+making it easier to interact with the file system, run scripts, and perform other command-line operations.
+
+# Installation
+
+  Here '-g' is used for a global installation  
+  ```
+    $ npm install [-g] shelljs
+  ```
+
+# Features:
+
+- ShellJS is a portable implementation of Unix shell commands that can be used on Windows, Linux, and macOS.
+- It is built on top of the Node.js API, providing a convenient way to execute shell commands using JavaScript
+- With ShellJS, you can perform common shell operations such as copying files, moving files, deleting files, creating directories, and running shell scripts.
+- It provides a simple and intuitive API that mimics the behavior of popular Unix shell commands, making it easy to write cross-platform scripts.
+- ShellJS is widely used in Node.js projects for automating tasks, building scripts, and managing file operations.
+- It offers a range of features, including globbing patterns for file matching, piping commands, and handling command output.

npm_Modules/ShellJs/shelljs.js

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+var shell = require('shelljs');
+
+if (!shell.which('git')) {
+  shell.echo('Sorry, this script requires git');
+  shell.exit(1);
+}
+
+// Copy files to release dir
+shell.rm('-rf', 'out/Release');
+shell.cp('-R', 'stuff/', 'out/Release');
+
+// Replace macros in each .js file
+shell.cd('lib');
+shell.ls('*.js').forEach(function (file) {
+  shell.sed('-i', 'BUILD_VERSION', 'v0.1.2', file);
+  shell.sed('-i', /^.*REMOVE_THIS_LINE.*$/, '', file);
+  shell.sed('-i', /.*REPLACE_LINE_WITH_MACRO.*\n/, shell.cat('macro.js'), file);
+});
+shell.cd('..');
+
+// Run external tool synchronously
+if (shell.exec('git commit -am "Auto-commit"').code !== 0) {
+  shell.echo('Error: Git commit failed');
+  shell.exit(1);
+}