add task solution

.github/workflows/test.yml-template

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm test

app.js

@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+/* eslint-disable no-console */
+'use strict';
+
+function ensureNode20Plus() {
+  const major = Number(String(process.versions.node).split('.')[0]);
+
+  if (!Number.isFinite(major) || major < 20) {
+    console.error('Node.js v20 or higher is required to run this CLI.');
+    process.exit(1);
+  }
+}
+
+ensureNode20Plus();
+
+const fs = require('fs');
+const path = require('path');
+
+function die(msg) {
+  console.error(msg);
+  process.exit(1);
+}
+
+const args = process.argv.slice(2);
+
+if (args.length !== 2) {
+  die('Two arguments required: source and destination');
+}
+
+const [source, destination] = args;
+
+const sourcePath = path.resolve(source);
+const destinationPath = path.resolve(destination);
+
+if (sourcePath === destinationPath) {
+  process.exit(0);
+}
+
+let sourceStat;
+
+try {
+  sourceStat = fs.statSync(sourcePath);
+} catch {
+  die('Source file does not exist');
+}
+
+if (!sourceStat.isFile()) {
+  die('Source must be a file');
+}
+
+try {
+  const destStat = fs.statSync(destinationPath);
+
+  if (destStat.isDirectory()) {
+    die('Destination must be a file');
+  }
+} catch (e) {
+  if (e && e.code && e.code !== 'ENOENT') {
+    die(e.message);
+  }
+}
+
+try {
+  fs.copyFileSync(sourcePath, destinationPath);
+} catch (e) {
+  die(e.message);
+}