diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 00000000..755c365b
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,17 @@
+{
+  "name": "node-nodejs-fundamentals",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "node-nodejs-fundamentals",
+      "version": "1.0.0",
+      "license": "ISC",
+      "engines": {
+        "node": ">=24.10.0",
+        "npm": ">=10.9.2"
+      }
+    }
+  }
+}
diff --git a/src/cli/interactive.js b/src/cli/interactive.js
index d0e3e0d9..600d0215 100644
--- a/src/cli/interactive.js
+++ b/src/cli/interactive.js
@@ -1,8 +1,44 @@
+import readline from "readline";
 const interactive = () => {
   // Write your code here
   // Use readline module for interactive CLI
   // Support commands: uptime, cwd, date, exit
   // Handle Ctrl+C and unknown commands
+
+  const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout,
+    prompt: "> ",
+  });
+  console.log("Welcome! Type a command");
+  rl.prompt();
+
+  rl.on("line", (line) => {
+    const command = line.trim();
+
+    switch (command) {
+      case "uptime":
+        console.log(`Uptime: ${process.uptime().toFixed(2)}s`);
+        break;
+      case "cwd":
+        console.log(process.cwd());
+        break;
+      case "date":
+        console.log(new Date().toISOString());
+        break;
+      case "exit":
+        rl.close();
+        return;
+      default:
+        console.log("Unknown command");
+    }
+
+    rl.prompt();
+  });
+  rl.on("close", () => {
+    console.log("Goodbye!");
+    process.exit(0);
+  });
 };
 
 interactive();
diff --git a/src/cli/progress.js b/src/cli/progress.js
index 3e060763..a9ff5a35 100644
--- a/src/cli/progress.js
+++ b/src/cli/progress.js
@@ -3,6 +3,48 @@ const progress = () => {
   // Simulate progress bar from 0% to 100% over ~5 seconds
   // Update in place using \r every 100ms
   // Format: [████████████████████          ] 67%
+  const args = process.argv;
+
+  const durationIndex = args.indexOf("--duration");
+  const duration =
+    durationIndex !== -1 ? Number(args[durationIndex + 1]) : 5000;
+
+  const intervalIndex = args.indexOf("--interval");
+  const interval = intervalIndex !== -1 ? Number(args[intervalIndex + 1]) : 100;
+
+  const lengthlIndex = args.indexOf("--length");
+  const length = lengthlIndex !== -1 ? Number(args[lengthlIndex + 1]) : 30;
+
+  const colorIndex = args.indexOf("--color");
+  const color = colorIndex !== -1 ? args[colorIndex + 1] : "";
+  console.log(color);
+
+  const steps = Math.floor(duration / interval);
+
+  let currentStep = 0;
+
+  const timer = setInterval(() => {
+    currentStep++;
+
+    const percent = Math.floor((currentStep / steps) * 100);
+
+    const filled = Math.floor((percent / 100) * length);
+
+    const bar =
+      "[" +
+      "█".repeat(filled) +
+      " ".repeat(length - filled) +
+      "] " +
+      percent +
+      "%";
+
+    process.stdout.write("\r" + bar);
+
+    if (currentStep >= steps) {
+      clearInterval(timer);
+      console.log("\nDone!");
+    }
+  }, interval);
 };
 
 progress();
diff --git a/src/fs/findByExt.js b/src/fs/findByExt.js
index 24f06cb8..9993434c 100644
--- a/src/fs/findByExt.js
+++ b/src/fs/findByExt.js
@@ -1,7 +1,44 @@
+import path from "path";
+import fs from "fs/promises";
+
 const findByExt = async () => {
   // Write your code here
   // Recursively find all files with specific extension
   // Parse --ext CLI argument (default: .txt)
+
+  try {
+    await fs.stat("./workspace");
+  } catch (e) {
+    throw new Error("FS operation failed");
+  }
+  console.log(process.argv);
+  let files = [];
+  const extIndex = process.argv.indexOf("--ext");
+  const ext = extIndex !== -1 ? process.argv[extIndex + 1] : "txt";
+  // console.log(extIndex);
+  // console.log(ext);
+
+  const scan = async (currPath) => {
+    const entries = await fs.readdir(currPath, { withFileTypes: true });
+    // console.log(entries);
+    for (const item of entries) {
+      const fullPath = path.join(currPath, item.name);
+      const relativePath = path
+        .relative("./workspace", fullPath)
+        .replace(/\\/g, "/");
+
+      if (item.isDirectory()) {
+        await scan(fullPath); // рекурсивно сканируем
+      }
+
+      if (item.isFile() && path.extname(item.name).slice(1) === ext) {
+        files.push(relativePath); // сохраняем путь файла с нужным расширением
+      }
+    }
+  };
+
+  await scan("./workspace");
+  files.sort().forEach((f) => console.log(f));
 };
 
 await findByExt();
diff --git a/src/fs/merge.js b/src/fs/merge.js
index cb8e0d8f..3384e059 100644
--- a/src/fs/merge.js
+++ b/src/fs/merge.js
@@ -1,8 +1,37 @@
+import fs from "fs/promises";
+import path from "path";
+
 const merge = async () => {
   // Write your code here
   // Default: read all .txt files from workspace/parts in alphabetical order
   // Optional: support --files filename1,filename2,... to merge specific files in provided order
   // Concatenate content and write to workspace/merged.txt
+  let filesToMerge = [];
+  let result = "";
+  const folderPath = "./workspace/parts";
+  try {
+    await fs.access(folderPath);
+
+    const extIndex = process.argv.indexOf("--files");
+    if (extIndex !== -1) {
+      filesToMerge = process.argv[extIndex + 1].split(",");
+    } else {
+      let entries = await fs.readdir(folderPath, { withFileTypes: true });
+
+      let step1 = entries.filter((e) => e.isFile() && e.name.endsWith(".txt"));
+      let step2 = step1.map((e) => e.name);
+      filesToMerge = step2.sort();
+    }
+    if (filesToMerge.length === 0) throw new Error();
+    for (const file of filesToMerge) {
+      const entry = await fs.readFile(path.join(folderPath, file), "utf8");
+      result += entry;
+      console.log(result);
+    }
+    await fs.writeFile("./workspace/merged.txt", result);
+  } catch {
+    throw new Error("FS operation failed");
+  }
 };
 
 await merge();
diff --git a/src/fs/restore.js b/src/fs/restore.js
index 96ae1ffb..c7448b74 100644
--- a/src/fs/restore.js
+++ b/src/fs/restore.js
@@ -1,8 +1,44 @@
+import path from "path";
+import fs from "fs/promises";
+
 const restore = async () => {
   // Write your code here
   // Read snapshot.json
   // Treat snapshot.rootPath as metadata only
   // Recreate directory/file structure in workspace_restored
+
+  try {
+    await fs.stat("./snapshot.json");
+  } catch {
+    throw new Error("FS operation failed");
+  }
+
+  try {
+    await fs.stat("./workspace_restored");
+    // throw new Error("FS operation failed");
+  } catch (e) {
+    if (e.message === "FS operation failed") {
+      throw e;
+    }
+    await fs.mkdir("./workspace_restored");
+  }
+
+  try {
+    const data = await fs.readFile("./snapshot.json", "utf-8");
+    const snapshot = JSON.parse(data);
+    for (const item of snapshot.entries) {
+      const filePath = path.join("./workspace_restored", item.path);
+      console.log(filePath);
+      if (item.type === "directory") {
+        await fs.mkdir(filePath, { recursive: true });
+      }
+      if (item.type === "file") {
+        await fs.writeFile(filePath, item.content, "base64");
+      }
+    }
+  } catch (e) {
+    console.log(e);
+  }
 };
 
 await restore();
diff --git a/src/fs/snapshot.js b/src/fs/snapshot.js
index 050103d3..cf34a1c0 100644
--- a/src/fs/snapshot.js
+++ b/src/fs/snapshot.js
@@ -1,9 +1,72 @@
+import path from "path";
+import fs from "fs/promises";
+
+import { fileURLToPath } from "url";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
 const snapshot = async () => {
-  // Write your code here
-  // Recursively scan workspace directory
-  // Write snapshot.json with:
-  // - rootPath: absolute path to workspace
-  // - entries: flat array of relative paths and metadata
+  const workspacePath = path.join(__dirname, "workspace");
+  const stats = await fs.stat(workspacePath);
+  const rootPath = path.resolve(workspacePath);
+  if (!stats.isDirectory()) {
+    throw new Error("FS operation failed");
+  }
+
+  const entries = [];
+
+  const scan = async (currentPath) => {
+    try {
+      let data = await fs.readdir(currentPath, { withFileTypes: true });
+      for (const item of data) {
+        const fullPath = path.join(currentPath, item.name);
+        const relativePath = path.relative(rootPath, fullPath);
+
+        if (item.isDirectory()) {
+          console.log("DIR:", item.name);
+          entries.push({
+            path: relativePath,
+            type: "directory",
+          });
+          console.log(entries);
+          await scan(fullPath);
+        }
+        if (item.isFile()) {
+          const buffer = await fs.readFile(fullPath);
+          const size = buffer.length;
+          const content = buffer.toString("base64");
+          console.log("FILE:", item.name);
+          entries.push({
+            path: relativePath,
+            type: "file",
+            size,
+            content,
+          });
+        }
+      }
+    } catch (err) {
+      console.log(err);
+    }
+
+    // console.log(path.basename());
+    //  const workspacePath = path.join(process.cwd(), "home");
+    // Write your code here
+    // Recursively scan workspace directory
+    // Write snapshot.json with:
+    // - rootPath: absolute path to workspace
+    // - entries: flat array of relative paths and metadata
+  };
+
+  await scan(workspacePath);
+  const result = {
+    rootPath,
+    entries,
+  };
+  console.log(result);
+  const snapshotPath = path.join(path.dirname(workspacePath), "snapshot.json");
+
+  await fs.writeFile(snapshotPath, JSON.stringify(result, null, 2));
 };
 
 await snapshot();