diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
new file mode 100644
index 00000000..9aa0fabf
--- /dev/null
+++ b/implement-shell-tools/cat/cat.js
@@ -0,0 +1,36 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("my-cat")
+  .description("Reimplementation of the Unix `cat` command with -n and -b support")
+  .option("-n", "number all lines")
+  .option("-b", "number non-empty lines")
+  .argument("<files...>", "files to read");
+
+program.parse();
+
+const options = program.opts();
+const filePaths = program.args;
+
+let lineNumber = 1;
+
+for (const filePath of filePaths) {
+  const content = await fs.readFile(filePath, "utf-8");
+
+  for (const line of content.split("\n")) {
+    if (options.n) {
+      console.log(`${String(lineNumber).padStart(6, ' ')}  ${line}`);
+      lineNumber++;
+    } else if (options.b) {
+      if (line.trim()) {
+        console.log(`${String(lineNumber).padStart(6, ' ')}  ${line}`);
+        lineNumber++;
+      } else {
+        console.log("");
+      }
+    } else {
+      console.log(line);
+    }
+  }
+}
diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js
new file mode 100644
index 00000000..cdccb524
--- /dev/null
+++ b/implement-shell-tools/ls/ls.js
@@ -0,0 +1,28 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("my-ls")
+  .description("Reimplementation of the Unix `ls` command with -1 and -a options")
+  .option("-1", "list one file per line")
+  .option("-a", "include hidden files")
+  .argument("[directory]", "directory to list");
+
+program.parse();
+
+const options = program.opts();
+
+const directory = program.args[0] || "."; // Use current directory as default if no argument is provided
+
+const files = await fs.readdir(directory);
+
+const visibleFiles = options.a ? files : files.filter(file => !file.startsWith("."));
+
+if (options["1"]) {
+  for (const file of visibleFiles) {
+    console.log(file);
+  }
+} else {
+  console.log(visibleFiles.join("       "));
+}
+  
\ No newline at end of file
diff --git a/implement-shell-tools/package-lock.json b/implement-shell-tools/package-lock.json
new file mode 100644
index 00000000..35bb20ea
--- /dev/null
+++ b/implement-shell-tools/package-lock.json
@@ -0,0 +1,25 @@
+{
+  "name": "implement-shell-tools",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "implement-shell-tools",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "commander": "^14.0.0"
+      }
+    },
+    "node_modules/commander": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-14.0.0.tgz",
+      "integrity": "sha512-2uM9rYjPvyq39NwLRqaiLtWHyDC1FvryJDa2ATTVims5YAS4PupsEQsDvP14FqhFr0P49CYDugi59xaxJlTXRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    }
+  }
+}
diff --git a/implement-shell-tools/package.json b/implement-shell-tools/package.json
new file mode 100644
index 00000000..809da8b9
--- /dev/null
+++ b/implement-shell-tools/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "implement-shell-tools",
+  "version": "1.0.0",
+  "description": "Your task is to re-implement shell tools you have used.",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "commander": "^14.0.0"
+  }
+}
diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
new file mode 100644
index 00000000..197d8d10
--- /dev/null
+++ b/implement-shell-tools/wc/wc.js
@@ -0,0 +1,55 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("my-wc")
+  .description("Reimplementation of the Unix `wc` command supporting -l, -w, and -c flags")
+  .option("-l", "show line count")
+  .option("-w", "show word count")
+  .option("-c", "show character count")
+  .argument("<files...>", "files to read");
+
+program.parse();
+
+const options = program.opts();
+const filePaths = program.args;
+
+function formatCounts(lines, words, chars, options) {
+  let result = "";
+
+  if (options.l || options.w || options.c) {
+    if (options.l) result += `${lines}  `;
+    if (options.w) result += `${words}  `;
+    if (options.c) result += `${chars}  `;
+  } else {
+    result += `${lines} ${words} ${chars} `;
+  }
+  
+  return result;
+}
+
+let totalLines = 0;
+let totalWords = 0;
+let totalChars = 0;
+
+for (const filePath of filePaths) {
+  const content = await fs.readFile(filePath, "utf-8");
+
+  const lineCount = (content.match(/\n/g) || []).length;
+  const wordCount = content.trim().split(/\s+/).length;
+  const charCount = content.length;
+
+  totalLines += lineCount;
+  totalWords += wordCount;
+  totalChars += charCount;
+
+  const output = formatCounts(lineCount, wordCount, charCount, options);
+
+  console.log(`${output}${filePath}`);
+}
+
+if (filePaths.length > 1) {
+  const totalOutput = formatCounts(totalLines, totalWords, totalChars, options);
+
+  console.log(`${totalOutput}total`);
+}