From 9b7a67272293a79477d57a63ac9b25a70945fe73 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Tue, 24 Mar 2026 21:41:26 +0000
Subject: [PATCH 01/17] cat without flag

---
 implement-shell-tools/cat/cat.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 implement-shell-tools/cat/cat.js

diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
new file mode 100644
index 000000000..6296dfcf9
--- /dev/null
+++ b/implement-shell-tools/cat/cat.js
@@ -0,0 +1,13 @@
+import process from "node:process";
+import { promises as fs } from "node:fs";
+
+const argv = process.argv.slice(2);
+if (argv.length < 1) {
+    console.error(`Expected exactly 1 or more arguments (paths) to be passed but got ${argv.length}.`);
+    process.exit(1);
+}
+const paths = argv;
+
+for (const path of paths) {
+    console.log(await fs.readFile(path, "utf-8"));
+}

From ed6323db872a93f48350f0279c8e68ffca6d2ba6 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 10:25:41 +0000
Subject: [PATCH 02/17] Fix newline

---
 implement-shell-tools/cat/cat.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
index 6296dfcf9..33d4918aa 100644
--- a/implement-shell-tools/cat/cat.js
+++ b/implement-shell-tools/cat/cat.js
@@ -6,8 +6,12 @@ if (argv.length < 1) {
     console.error(`Expected exactly 1 or more arguments (paths) to be passed but got ${argv.length}.`);
     process.exit(1);
 }
-const paths = argv;
 
-for (const path of paths) {
-    console.log(await fs.readFile(path, "utf-8"));
+const stringArr = [];
+for (const path of argv) {
+    stringArr.push(await fs.readFile(path, "utf-8"));
 }
+
+for (let i = 0; i < stringArr.length; i++) {
+    console.log(stringArr[i].trim())
+}
\ No newline at end of file

From c2d2692051f0db86db1de062c209a58384a22012 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 11:11:29 +0000
Subject: [PATCH 03/17] Add logic to count lines

---
 implement-shell-tools/cat/cat.js | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
index 33d4918aa..5b406dbbf 100644
--- a/implement-shell-tools/cat/cat.js
+++ b/implement-shell-tools/cat/cat.js
@@ -1,7 +1,13 @@
+import { program } from "commander";
 import process from "node:process";
 import { promises as fs } from "node:fs";
 
-const argv = process.argv.slice(2);
+let showNumber = false;
+
+program.name("cat").description("Prints the output of a file to the console").option("-n, --number", "Displays the lines along with their number").argument("<path>", "The file path").allowExcessArguments()
+program.parse()
+
+const argv = program.args
 if (argv.length < 1) {
     console.error(`Expected exactly 1 or more arguments (paths) to be passed but got ${argv.length}.`);
     process.exit(1);
@@ -12,6 +18,9 @@ for (const path of argv) {
     stringArr.push(await fs.readFile(path, "utf-8"));
 }
 
-for (let i = 0; i < stringArr.length; i++) {
-    console.log(stringArr[i].trim())
+const flatArr = stringArr.flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l !== ""));
+
+if (!showNumber) console.log(flatArr.join(""))
+else {
+console.log(flatArr.map((l, i) => `${i + 1} ${l}`).join(""))
 }
\ No newline at end of file

From 2b3c0d319b4102b68036eabca512dde92d79a2c2 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 11:12:28 +0000
Subject: [PATCH 04/17] Tweak format

---
 implement-shell-tools/cat/cat.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
index 5b406dbbf..d702ad51d 100644
--- a/implement-shell-tools/cat/cat.js
+++ b/implement-shell-tools/cat/cat.js
@@ -21,6 +21,4 @@ for (const path of argv) {
 const flatArr = stringArr.flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l !== ""));
 
 if (!showNumber) console.log(flatArr.join(""))
-else {
-console.log(flatArr.map((l, i) => `${i + 1} ${l}`).join(""))
-}
\ No newline at end of file
+else console.log(flatArr.map((l, i) => `${i + 1} ${l}`).join(""))
\ No newline at end of file

From 379a512fb339caa4750e28f7664c1bc5c12edcb1 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 11:13:55 +0000
Subject: [PATCH 05/17] Add program package

---
 implement-shell-tools/cat/package-lock.json | 25 +++++++++++++++++++++
 implement-shell-tools/cat/package.json      | 15 +++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 implement-shell-tools/cat/package-lock.json
 create mode 100644 implement-shell-tools/cat/package.json

diff --git a/implement-shell-tools/cat/package-lock.json b/implement-shell-tools/cat/package-lock.json
new file mode 100644
index 000000000..737542646
--- /dev/null
+++ b/implement-shell-tools/cat/package-lock.json
@@ -0,0 +1,25 @@
+{
+  "name": "cat",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "cat",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "commander": "^14.0.3"
+      }
+    },
+    "node_modules/commander": {
+      "version": "14.0.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-14.0.3.tgz",
+      "integrity": "sha512-H+y0Jo/T1RZ9qPP4Eh1pkcQcLRglraJaSLoyOtHxu6AapkjWVCy2Sit1QQ4x3Dng8qDlSsZEet7g5Pq06MvTgw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    }
+  }
+}
diff --git a/implement-shell-tools/cat/package.json b/implement-shell-tools/cat/package.json
new file mode 100644
index 000000000..d6423e6f3
--- /dev/null
+++ b/implement-shell-tools/cat/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "cat",
+  "version": "1.0.0",
+  "description": "You should already be familiar with the `cat` command line tool.",
+  "license": "ISC",
+  "author": "",
+  "type": "module",
+  "main": "cat.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": {
+    "commander": "^14.0.3"
+  }
+}

From 24320912e9c3d1316afc61d8b839cb6065b07d14 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 11:17:38 +0000
Subject: [PATCH 06/17] cat complete

---
 implement-shell-tools/cat/cat.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
index d702ad51d..a77d12d38 100644
--- a/implement-shell-tools/cat/cat.js
+++ b/implement-shell-tools/cat/cat.js
@@ -13,6 +13,8 @@ if (argv.length < 1) {
     process.exit(1);
 }
 
+if (program.opts().number) showNumber = true;
+
 const stringArr = [];
 for (const path of argv) {
     stringArr.push(await fs.readFile(path, "utf-8"));

From 0bfe406412a549fba216ac10613239b96a0b5d97 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 11:50:31 +0000
Subject: [PATCH 07/17] list files from current directory

---
 implement-shell-tools/ls/ls.js | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 implement-shell-tools/ls/ls.js

diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js
new file mode 100644
index 000000000..dda0ea719
--- /dev/null
+++ b/implement-shell-tools/ls/ls.js
@@ -0,0 +1,7 @@
+import fs from 'node:fs';
+
+const folderPath = '.';
+
+const contents = fs.readdirSync(folderPath);
+
+console.log(contents.join("  "));
\ No newline at end of file

From cd612692863879985fd66a6afb24c915bc793cb0 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 11:58:47 +0000
Subject: [PATCH 08/17] ls can list from other directories

---
 implement-shell-tools/ls/ls.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js
index dda0ea719..8e94abe84 100644
--- a/implement-shell-tools/ls/ls.js
+++ b/implement-shell-tools/ls/ls.js
@@ -1,6 +1,9 @@
+import process from 'node:process';
 import fs from 'node:fs';
 
-const folderPath = '.';
+const argv = process.argv.slice(2)
+
+const folderPath = argv[0] || ".";
 
 const contents = fs.readdirSync(folderPath);
 

From 74981d40b6d33e219b92ba2c029cc65c6c1b1788 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 13:03:18 +0000
Subject: [PATCH 09/17] Add vertical print

---
 implement-shell-tools/ls/ls.js             | 19 ++++++++++++++--
 implement-shell-tools/ls/package-lock.json | 25 ++++++++++++++++++++++
 implement-shell-tools/ls/package.json      | 16 ++++++++++++++
 3 files changed, 58 insertions(+), 2 deletions(-)
 create mode 100644 implement-shell-tools/ls/package-lock.json
 create mode 100644 implement-shell-tools/ls/package.json

diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js
index 8e94abe84..5bcdfe41f 100644
--- a/implement-shell-tools/ls/ls.js
+++ b/implement-shell-tools/ls/ls.js
@@ -1,10 +1,25 @@
+import { program } from "commander";
 import process from 'node:process';
 import fs from 'node:fs';
 
-const argv = process.argv.slice(2)
+let vertical = false;
+
+program.name("list-directory-contents").description("Shows all files and folders in a directory").option("-1", "List one file/directory per line").argument("[path]", "Path of the directory to list (defaults to .)")
+
+program.parse();
+
+const argv = program.args;
+
+vertical = program.opts()[1]
 
 const folderPath = argv[0] || ".";
 
 const contents = fs.readdirSync(folderPath);
 
-console.log(contents.join("  "));
\ No newline at end of file
+if (!vertical) {
+    console.log(contents.join("  "));
+} else {
+    for (const content of contents) {
+        console.log(content);
+    }
+}
\ No newline at end of file
diff --git a/implement-shell-tools/ls/package-lock.json b/implement-shell-tools/ls/package-lock.json
new file mode 100644
index 000000000..74bc88d5b
--- /dev/null
+++ b/implement-shell-tools/ls/package-lock.json
@@ -0,0 +1,25 @@
+{
+  "name": "ls",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "ls",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "commander": "^14.0.3"
+      }
+    },
+    "node_modules/commander": {
+      "version": "14.0.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-14.0.3.tgz",
+      "integrity": "sha512-H+y0Jo/T1RZ9qPP4Eh1pkcQcLRglraJaSLoyOtHxu6AapkjWVCy2Sit1QQ4x3Dng8qDlSsZEet7g5Pq06MvTgw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    }
+  }
+}
diff --git a/implement-shell-tools/ls/package.json b/implement-shell-tools/ls/package.json
new file mode 100644
index 000000000..43e0a50d8
--- /dev/null
+++ b/implement-shell-tools/ls/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "ls",
+  "version": "1.0.0",
+  "description": "You should already be familiar with the `ls` command line tool.",
+  "main": "ls.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "commander": "^14.0.3"
+  }
+}

From 7eeb2182ae8642a1ad2cde9bbf2ae3ab85b9b017 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 13:17:42 +0000
Subject: [PATCH 10/17] Hidden files

---
 implement-shell-tools/ls/ls.js | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js
index 5bcdfe41f..3de469656 100644
--- a/implement-shell-tools/ls/ls.js
+++ b/implement-shell-tools/ls/ls.js
@@ -3,23 +3,29 @@ import process from 'node:process';
 import fs from 'node:fs';
 
 let vertical = false;
+let showHidden = false;
 
-program.name("list-directory-contents").description("Shows all files and folders in a directory").option("-1", "List one file/directory per line").argument("[path]", "Path of the directory to list (defaults to .)")
+program.name("list-directory-contents").description("Shows all files and folders in a directory").option("-1", "List one file/directory per line").option("-a, --all", "Show hidden files").argument("[path]", "Path of the directory to list (defaults to .)")
 
 program.parse();
 
 const argv = program.args;
 
-vertical = program.opts()[1]
+vertical = program.opts()[1];
+showHidden = program.opts().all;
 
 const folderPath = argv[0] || ".";
 
 const contents = fs.readdirSync(folderPath);
 
+const filtered = contents.filter(f => f[0] !== ".")
+
+const dirArr = !showHidden ? filtered : contents
+
 if (!vertical) {
-    console.log(contents.join("  "));
+    console.log(dirArr.join("  "));
 } else {
-    for (const content of contents) {
+    for (const content of dirArr) {
         console.log(content);
     }
 }
\ No newline at end of file

From 6f2610498230ce8e61186d59f803ce4b0522bca4 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 13:19:23 +0000
Subject: [PATCH 11/17] Tweak number logic

---
 implement-shell-tools/cat/cat.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
index a77d12d38..de1d861ee 100644
--- a/implement-shell-tools/cat/cat.js
+++ b/implement-shell-tools/cat/cat.js
@@ -13,7 +13,7 @@ if (argv.length < 1) {
     process.exit(1);
 }
 
-if (program.opts().number) showNumber = true;
+showNumber = program.opts().number
 
 const stringArr = [];
 for (const path of argv) {

From a6ef52850ac5dce1b20e5b50bedef624f7bcd440 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 17:16:35 +0000
Subject: [PATCH 12/17] Calculate data per file

---
 implement-shell-tools/wc/package-lock.json | 25 +++++++++++++++++
 implement-shell-tools/wc/package.json      | 16 +++++++++++
 implement-shell-tools/wc/wc.js             | 31 ++++++++++++++++++++++
 3 files changed, 72 insertions(+)
 create mode 100644 implement-shell-tools/wc/package-lock.json
 create mode 100644 implement-shell-tools/wc/package.json
 create mode 100644 implement-shell-tools/wc/wc.js

diff --git a/implement-shell-tools/wc/package-lock.json b/implement-shell-tools/wc/package-lock.json
new file mode 100644
index 000000000..8aa122ddd
--- /dev/null
+++ b/implement-shell-tools/wc/package-lock.json
@@ -0,0 +1,25 @@
+{
+  "name": "wc",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "wc",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "commander": "^14.0.3"
+      }
+    },
+    "node_modules/commander": {
+      "version": "14.0.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-14.0.3.tgz",
+      "integrity": "sha512-H+y0Jo/T1RZ9qPP4Eh1pkcQcLRglraJaSLoyOtHxu6AapkjWVCy2Sit1QQ4x3Dng8qDlSsZEet7g5Pq06MvTgw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    }
+  }
+}
diff --git a/implement-shell-tools/wc/package.json b/implement-shell-tools/wc/package.json
new file mode 100644
index 000000000..dc9367c92
--- /dev/null
+++ b/implement-shell-tools/wc/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "wc",
+  "version": "1.0.0",
+  "description": "You should already be familiar with the `wc` command line tool.",
+  "main": "wc.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "commander": "^14.0.3"
+  }
+}
diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
new file mode 100644
index 000000000..9655deb04
--- /dev/null
+++ b/implement-shell-tools/wc/wc.js
@@ -0,0 +1,31 @@
+import { program } from "commander";
+import process from "node:process";
+import { promises as fs } from "node:fs";
+
+program.name("wc").description("Print the number of lines, word and bytes for each file and a total if there are multiple files")
+.option("-l, --lines", "Print the number of lines")
+.option("-w, --words", "Print the number of words")
+.option("-c, --bytes", "Print the number of bytes")
+.argument("<path>", "The file path").allowExcessArguments()
+program.parse()
+
+const argv = program.args;
+
+
+const stringArr = [];
+for (const path of argv) {
+    stringArr.push(await fs.readFile(path, "utf-8"));
+}
+
+const infoArr = [];
+for (let i = 0; i < stringArr.length; i++) {
+    const arr = [];
+    const line = stringArr[i].split("\n")//.filter(e => e.includes("\n"))
+    arr.push(line.length - 1)
+    arr.push(stringArr[i].split(" ").flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l.trim() !== "")).length)
+    arr.push(new Blob([stringArr[i]]).size)
+    arr.push(argv[i])
+    infoArr.push(arr.join(" "))
+}
+
+console.log(infoArr)
\ No newline at end of file

From 24adf292ef84b90c319fd6eea05bd840bc570b1b Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 17:24:47 +0000
Subject: [PATCH 13/17] Add total

---
 implement-shell-tools/wc/wc.js | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
index 9655deb04..20cf473fb 100644
--- a/implement-shell-tools/wc/wc.js
+++ b/implement-shell-tools/wc/wc.js
@@ -17,15 +17,25 @@ for (const path of argv) {
     stringArr.push(await fs.readFile(path, "utf-8"));
 }
 
+let lines = 0;
+let words = 0;
+let bytes = 0;
+
 const infoArr = [];
 for (let i = 0; i < stringArr.length; i++) {
     const arr = [];
-    const line = stringArr[i].split("\n")//.filter(e => e.includes("\n"))
-    arr.push(line.length - 1)
-    arr.push(stringArr[i].split(" ").flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l.trim() !== "")).length)
-    arr.push(new Blob([stringArr[i]]).size)
+    const line = stringArr[i].split("\n").length
+    const wc = stringArr[i].split(" ").flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l.trim() !== "")).length
+    const lineByte = new Blob([stringArr[i]]).size
+    arr.push(line - 1)
+    lines += line - 1;
+    arr.push(wc);
+    words += wc;
+    arr.push(lineByte)
+    bytes += lineByte
     arr.push(argv[i])
     infoArr.push(arr.join(" "))
 }
 
+if (infoArr.length > 1) infoArr.push([lines, words, bytes, "total"].join(" "))
 console.log(infoArr)
\ No newline at end of file

From 9dd458361bd972d505f758dea1cfd6021fdca0aa Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 17:33:39 +0000
Subject: [PATCH 14/17] Format wc

---
 implement-shell-tools/wc/wc.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
index 20cf473fb..5775338f4 100644
--- a/implement-shell-tools/wc/wc.js
+++ b/implement-shell-tools/wc/wc.js
@@ -38,4 +38,4 @@ for (let i = 0; i < stringArr.length; i++) {
 }
 
 if (infoArr.length > 1) infoArr.push([lines, words, bytes, "total"].join(" "))
-console.log(infoArr)
\ No newline at end of file
+console.log(infoArr.join("\n"))
\ No newline at end of file

From 62821e43416a34326d047e1d412d5cc7a2d79f05 Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 18:58:06 +0000
Subject: [PATCH 15/17] flags

---
 implement-shell-tools/wc/wc.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
index 5775338f4..ceedc8e92 100644
--- a/implement-shell-tools/wc/wc.js
+++ b/implement-shell-tools/wc/wc.js
@@ -2,6 +2,10 @@ import { program } from "commander";
 import process from "node:process";
 import { promises as fs } from "node:fs";
 
+let showLineCount = true;
+let showWordCount = true;
+let showByteCount = true;
+
 program.name("wc").description("Print the number of lines, word and bytes for each file and a total if there are multiple files")
 .option("-l, --lines", "Print the number of lines")
 .option("-w, --words", "Print the number of words")
@@ -11,6 +15,11 @@ program.parse()
 
 const argv = program.args;
 
+if (Object.keys(program.opts()).length >= 1) {
+    showLineCount = program.opts().lines;
+    showWordCount = program.opts().words;
+    showByteCount = program.opts().bytes;
+}
 
 const stringArr = [];
 for (const path of argv) {
@@ -27,12 +36,18 @@ for (let i = 0; i < stringArr.length; i++) {
     const line = stringArr[i].split("\n").length
     const wc = stringArr[i].split(" ").flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l.trim() !== "")).length
     const lineByte = new Blob([stringArr[i]]).size
+    if (showLineCount) {
     arr.push(line - 1)
     lines += line - 1;
+    }
+    if (showWordCount) {
     arr.push(wc);
     words += wc;
+    }
+    if (showByteCount) {
     arr.push(lineByte)
     bytes += lineByte
+    }
     arr.push(argv[i])
     infoArr.push(arr.join(" "))
 }

From a324eef9a2efe725ce5015cb096087fde5aed39a Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 20:02:57 +0000
Subject: [PATCH 16/17] Remove 0s from unwanted data

---
 implement-shell-tools/wc/wc.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
index ceedc8e92..71006b8e8 100644
--- a/implement-shell-tools/wc/wc.js
+++ b/implement-shell-tools/wc/wc.js
@@ -52,5 +52,11 @@ for (let i = 0; i < stringArr.length; i++) {
     infoArr.push(arr.join(" "))
 }
 
-if (infoArr.length > 1) infoArr.push([lines, words, bytes, "total"].join(" "))
+if (infoArr.length > 1) {
+    const totalArr = ["total"];
+    if (showByteCount) totalArr.unshift(bytes);
+    if (showWordCount) totalArr.unshift(words);
+    if (showLineCount) totalArr.unshift(lines);
+    infoArr.push(totalArr.join(" "))
+}
 console.log(infoArr.join("\n"))
\ No newline at end of file

From 37c7da2a1bac467a7912a067b3e15b639dddf0bb Mon Sep 17 00:00:00 2001
From: Craig D'Silva <craig.s.dsilva@gmail.com>
Date: Wed, 25 Mar 2026 20:09:59 +0000
Subject: [PATCH 17/17] Format

---
 implement-shell-tools/cat/cat.js | 32 +++++++++-----
 implement-shell-tools/ls/ls.js   | 25 ++++++-----
 implement-shell-tools/wc/wc.js   | 72 ++++++++++++++++++--------------
 3 files changed, 78 insertions(+), 51 deletions(-)

diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
index de1d861ee..c1638d83a 100644
--- a/implement-shell-tools/cat/cat.js
+++ b/implement-shell-tools/cat/cat.js
@@ -4,23 +4,35 @@ import { promises as fs } from "node:fs";
 
 let showNumber = false;
 
-program.name("cat").description("Prints the output of a file to the console").option("-n, --number", "Displays the lines along with their number").argument("<path>", "The file path").allowExcessArguments()
-program.parse()
+program
+  .name("cat")
+  .description("Prints the output of a file to the console")
+  .option("-n, --number", "Displays the lines along with their number")
+  .argument("<path>", "The file path")
+  .allowExcessArguments();
+program.parse();
 
-const argv = program.args
+const argv = program.args;
 if (argv.length < 1) {
-    console.error(`Expected exactly 1 or more arguments (paths) to be passed but got ${argv.length}.`);
-    process.exit(1);
+  console.error(
+    `Expected exactly 1 or more arguments (paths) to be passed but got ${argv.length}.`,
+  );
+  process.exit(1);
 }
 
-showNumber = program.opts().number
+showNumber = program.opts().number;
 
 const stringArr = [];
 for (const path of argv) {
-    stringArr.push(await fs.readFile(path, "utf-8"));
+  stringArr.push(await fs.readFile(path, "utf-8"));
 }
 
-const flatArr = stringArr.flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l !== ""));
+const flatArr = stringArr.flatMap((l) =>
+  l
+    .split("\n")
+    .map((l, i, a) => (i < a.length - 1 ? l + "\n" : l))
+    .filter((l) => l !== ""),
+);
 
-if (!showNumber) console.log(flatArr.join(""))
-else console.log(flatArr.map((l, i) => `${i + 1} ${l}`).join(""))
\ No newline at end of file
+if (!showNumber) console.log(flatArr.join(""));
+else console.log(flatArr.map((l, i) => `${i + 1} ${l}`).join(""));
diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js
index 3de469656..5e915ec19 100644
--- a/implement-shell-tools/ls/ls.js
+++ b/implement-shell-tools/ls/ls.js
@@ -1,11 +1,16 @@
 import { program } from "commander";
-import process from 'node:process';
-import fs from 'node:fs';
+import process from "node:process";
+import fs from "node:fs";
 
 let vertical = false;
 let showHidden = false;
 
-program.name("list-directory-contents").description("Shows all files and folders in a directory").option("-1", "List one file/directory per line").option("-a, --all", "Show hidden files").argument("[path]", "Path of the directory to list (defaults to .)")
+program
+  .name("list-directory-contents")
+  .description("Shows all files and folders in a directory")
+  .option("-1", "List one file/directory per line")
+  .option("-a, --all", "Show hidden files")
+  .argument("[path]", "Path of the directory to list (defaults to .)");
 
 program.parse();
 
@@ -18,14 +23,14 @@ const folderPath = argv[0] || ".";
 
 const contents = fs.readdirSync(folderPath);
 
-const filtered = contents.filter(f => f[0] !== ".")
+const filtered = contents.filter((f) => f[0] !== ".");
 
-const dirArr = !showHidden ? filtered : contents
+const dirArr = !showHidden ? filtered : contents;
 
 if (!vertical) {
-    console.log(dirArr.join("  "));
+  console.log(dirArr.join("  "));
 } else {
-    for (const content of dirArr) {
-        console.log(content);
-    }
-}
\ No newline at end of file
+  for (const content of dirArr) {
+    console.log(content);
+  }
+}
diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
index 71006b8e8..b15a673bd 100644
--- a/implement-shell-tools/wc/wc.js
+++ b/implement-shell-tools/wc/wc.js
@@ -6,24 +6,29 @@ let showLineCount = true;
 let showWordCount = true;
 let showByteCount = true;
 
-program.name("wc").description("Print the number of lines, word and bytes for each file and a total if there are multiple files")
-.option("-l, --lines", "Print the number of lines")
-.option("-w, --words", "Print the number of words")
-.option("-c, --bytes", "Print the number of bytes")
-.argument("<path>", "The file path").allowExcessArguments()
-program.parse()
+program
+  .name("wc")
+  .description(
+    "Print the number of lines, word and bytes for each file and a total if there are multiple files",
+  )
+  .option("-l, --lines", "Print the number of lines")
+  .option("-w, --words", "Print the number of words")
+  .option("-c, --bytes", "Print the number of bytes")
+  .argument("<path>", "The file path")
+  .allowExcessArguments();
+program.parse();
 
 const argv = program.args;
 
 if (Object.keys(program.opts()).length >= 1) {
-    showLineCount = program.opts().lines;
-    showWordCount = program.opts().words;
-    showByteCount = program.opts().bytes;
+  showLineCount = program.opts().lines;
+  showWordCount = program.opts().words;
+  showByteCount = program.opts().bytes;
 }
 
 const stringArr = [];
 for (const path of argv) {
-    stringArr.push(await fs.readFile(path, "utf-8"));
+  stringArr.push(await fs.readFile(path, "utf-8"));
 }
 
 let lines = 0;
@@ -32,31 +37,36 @@ let bytes = 0;
 
 const infoArr = [];
 for (let i = 0; i < stringArr.length; i++) {
-    const arr = [];
-    const line = stringArr[i].split("\n").length
-    const wc = stringArr[i].split(" ").flatMap(l => l.split("\n").map((l, i, a) => i < a.length - 1 ? l + "\n" : l).filter(l => l.trim() !== "")).length
-    const lineByte = new Blob([stringArr[i]]).size
-    if (showLineCount) {
-    arr.push(line - 1)
+  const arr = [];
+  const line = stringArr[i].split("\n").length;
+  const wc = stringArr[i].split(" ").flatMap((l) =>
+    l
+      .split("\n")
+      .map((l, i, a) => (i < a.length - 1 ? l + "\n" : l))
+      .filter((l) => l.trim() !== ""),
+  ).length;
+  const lineByte = new Blob([stringArr[i]]).size;
+  if (showLineCount) {
+    arr.push(line - 1);
     lines += line - 1;
-    }
-    if (showWordCount) {
+  }
+  if (showWordCount) {
     arr.push(wc);
     words += wc;
-    }
-    if (showByteCount) {
-    arr.push(lineByte)
-    bytes += lineByte
-    }
-    arr.push(argv[i])
-    infoArr.push(arr.join(" "))
+  }
+  if (showByteCount) {
+    arr.push(lineByte);
+    bytes += lineByte;
+  }
+  arr.push(argv[i]);
+  infoArr.push(arr.join(" "));
 }
 
 if (infoArr.length > 1) {
-    const totalArr = ["total"];
-    if (showByteCount) totalArr.unshift(bytes);
-    if (showWordCount) totalArr.unshift(words);
-    if (showLineCount) totalArr.unshift(lines);
-    infoArr.push(totalArr.join(" "))
+  const totalArr = ["total"];
+  if (showByteCount) totalArr.unshift(bytes);
+  if (showWordCount) totalArr.unshift(words);
+  if (showLineCount) totalArr.unshift(lines);
+  infoArr.push(totalArr.join(" "));
 }
-console.log(infoArr.join("\n"))
\ No newline at end of file
+console.log(infoArr.join("\n"));