diff --git a/.DS_Store b/.DS_Store
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diff --git a/implement-shell-tools/.DS_Store b/implement-shell-tools/.DS_Store
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diff --git a/implement-shell-tools/cat/cat.mjs b/implement-shell-tools/cat/cat.mjs
new file mode 100644
index 000000000..47651f179
--- /dev/null
+++ b/implement-shell-tools/cat/cat.mjs
@@ -0,0 +1,49 @@
+import process from "node:process";
+import { promises as fs } from "node:fs";
+import { program } from "commander";
+
+program
+  .name("Cat")
+  .description("My version of cat command line tool")
+  .argument("<files...>", "Files to display")
+  .option("-n, --number", "Number all output lines")
+  .option("-b, --non-blank", "Number non empty output lines");
+
+program.parse();
+
+const { number, nonBlank } = program.opts();
+const filePaths = program.args;
+
+let lineNumber = 1;
+
+for (const filePath of filePaths) {
+  try {
+    const content = await fs.readFile(filePath, "utf-8");
+
+    if (!number && !nonBlank) {
+      process.stdout.write(content);
+      continue;
+    }
+    let text = content;
+    if (content.endsWith("\n")) {
+      text = content.slice(0, -1);
+    }
+    const lines = text.split("\n");
+
+    for (const line of lines) {
+      if (nonBlank) {
+        if (line == "") {
+          console.log();
+        } else {
+          console.log(`${lineNumber}\t${line}`);
+          lineNumber++;
+        }
+      } else if (number) {
+        console.log(`${lineNumber}\t${line}`);
+        lineNumber++;
+      }
+    }
+  } catch (error) {
+    console.error(`${error}`);
+  }
+}
diff --git a/implement-shell-tools/ls/ls.mjs b/implement-shell-tools/ls/ls.mjs
new file mode 100644
index 000000000..2c1574b4b
--- /dev/null
+++ b/implement-shell-tools/ls/ls.mjs
@@ -0,0 +1,37 @@
+import process from "node:process";
+import { promises as fs } from "node:fs";
+import { program } from "commander";
+
+program
+  .name("list")
+  .description("Implement my version of ls")
+  .argument("[paths...]", "The file path to process")
+  .option("-1, --one", "This list the item one per line")
+  .option("-a, --all", "This lists all of the files");
+
+program.parse();
+
+const { one, all } = program.opts();
+const paths = program.args;
+
+let targetDir = paths[0] || ".";
+
+try {
+  let files = await fs.readdir(targetDir);
+
+  if (all) {
+    files = [".", "..", ...files].sort();
+  } else {
+    files = files.filter((output) => !output.startsWith(".")).sort();
+  }
+
+  if (one) {
+    for (const file of files) {
+      console.log(file);
+    }
+  } else {
+    console.log(files.join(" "));
+  }
+} catch (error) {
+  console.error(`${error}`);
+}
diff --git a/implement-shell-tools/package-lock.json b/implement-shell-tools/package-lock.json
new file mode 100644
index 000000000..5444e5c23
--- /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": "^15.0.0"
+      }
+    },
+    "node_modules/commander": {
+      "version": "15.0.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-15.0.0.tgz",
+      "integrity": "sha512-z67u4ZhzCL/Tydu1lJARtEZYWbWaN7oYLHbsuzocr6y4N6WZAagG3RQ4FW61V1/0+jImpj293XfrcYnd1qxtPg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    }
+  }
+}
diff --git a/implement-shell-tools/package.json b/implement-shell-tools/package.json
new file mode 100644
index 000000000..a05eb6f34
--- /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": "^15.0.0"
+  }
+}
diff --git a/implement-shell-tools/wc/sample-files/4.txt b/implement-shell-tools/wc/sample-files/4.txt
new file mode 100644
index 000000000..e69de29bb
diff --git a/implement-shell-tools/wc/wc.mjs b/implement-shell-tools/wc/wc.mjs
new file mode 100644
index 000000000..65c86e9c5
--- /dev/null
+++ b/implement-shell-tools/wc/wc.mjs
@@ -0,0 +1,84 @@
+import process from "node:process";
+import { promises as fs } from "node:fs";
+import { program } from "commander";
+
+program
+  .name("Word Count")
+  .description("my implementation of wc")
+  .argument("<path...>", "The file path to process")
+  .option("-l", "Count for the total number of lines")
+  .option("-c", "Count the total number of bytes")
+  .option("-w", "Count the total number of words");
+
+program.parse();
+
+let filePaths = program.args;
+let options = program.opts();
+let noFlags = !options.l && !options.w && !options.c;
+
+let totalLines = 0;
+let totalWords = 0;
+let totalBytes = 0;
+
+for (const filePath of filePaths) {
+  try {
+    const content = await fs.readFile(filePath, "utf-8");
+    const outputs = [];
+
+    const lines = getLineCount(content);
+    const words = getWordCount(content);
+    const bytes = getByteCount(content);
+
+    totalLines += lines;
+    totalWords += words;
+    totalBytes += bytes;
+
+    if (noFlags || options.l) {
+      outputs.push(lines);
+    }
+    if (noFlags || options.w) {
+      outputs.push(words);
+    }
+    if (noFlags || options.c) {
+      outputs.push(bytes);
+    }
+
+    outputs.push(filePath);
+    console.log(outputs.join("\t"));
+  } catch (err) {
+    console.error(`${err.message}`);
+  }
+}
+
+if (filePaths.length > 1) {
+  const totalOutputs = [];
+
+  if (noFlags || options.l) {
+    totalOutputs.push(totalLines);
+  }
+  if (noFlags || options.w) {
+    totalOutputs.push(totalWords);
+  }
+  if (noFlags || options.c) {
+    totalOutputs.push(totalBytes);
+  }
+  totalOutputs.push("total");
+  console.log(totalOutputs.join("\t"));
+}
+
+function getWordCount(text) {
+  const trimmed = text.trim();
+  if (trimmed.length == 0) {
+    return 0;
+  }
+  return trimmed.split(/\s+/).length;
+}
+
+function getLineCount(text) {
+  if (text.length == 0) return 0;
+  return text.split("\n").length - 1;
+}
+
+function getByteCount(text) {
+  return Buffer.byteLength(text, "utf-8");
+}