diff --git a/implement-shell-tools/cat/cat.js b/implement-shell-tools/cat/cat.js
new file mode 100644
index 000000000..75853869c
--- /dev/null
+++ b/implement-shell-tools/cat/cat.js
@@ -0,0 +1,40 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("cat command")
+  .description("create cat command")
+  .option("-n", "Number all lines")
+  .option("-b", "Number non-empty lines")
+  .argument("<paths...>", "File paths");
+
+program.parse();
+const paths = program.args;
+const number = program.opts().n;
+const nonEmptyLine = program.opts().b;
+
+let lineNumber = 1;
+ 
+for (const path of paths) {
+  try {
+    const read = await fs.readFile(path, "utf-8");
+    const lines = read.split("\n");
+    for (let i of lines) {
+      if (number) {
+        console.log(`${String(lineNumber).padStart(6, " ")} ${i}`);
+        lineNumber++;
+      } else if (nonEmptyLine) {
+        if (i.trim() !== "") {
+          console.log(`${String(lineNumber).padStart(6, " ")} ${i}`);
+          lineNumber++;
+        } else {
+          console.log(i);
+        }
+      } else {
+        console.log(i);
+      }
+    }
+  } catch (err) {
+    console.error(`File could not read: ${path}`);
+  }
+}
diff --git a/implement-shell-tools/ls/ls.js b/implement-shell-tools/ls/ls.js
new file mode 100644
index 000000000..634fac12a
--- /dev/null
+++ b/implement-shell-tools/ls/ls.js
@@ -0,0 +1,43 @@
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .name("ls command")
+  .description("create ls command")
+  .option("-1", "One entry per line")
+  .option("-a", "Show all files including hidden")
+  .argument("[paths...]", "File paths");
+
+program.parse();
+
+const opts = program.opts();
+const paths = program.args.length > 0 ? program.args : ["."];
+const onePerLine = opts["1"];
+const showAll = opts.a;
+
+for (const targetPath of paths) {
+  try {
+    let files = await fs.readdir(targetPath);
+
+    if (!showAll) {
+      files = files.filter((f) => !f.startsWith("."));
+    }
+
+    
+    if (paths.length > 1) {
+      console.log(`${targetPath}:`);
+    }
+
+    if (onePerLine) {
+      for (const f of files) console.log(f);
+    } else {
+      console.log(files.join("  "));
+    }
+
+    if (paths.length > 1) {
+      console.log(); 
+    }
+  } catch (err) {
+    console.error(`ls: cannot access '${targetPath}': ${err.message}`);
+  }
+}
diff --git a/implement-shell-tools/package-lock.json b/implement-shell-tools/package-lock.json
new file mode 100644
index 000000000..38a22987f
--- /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": "^14.0.2"
+      }
+    },
+    "node_modules/commander": {
+      "version": "14.0.2",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-14.0.2.tgz",
+      "integrity": "sha512-TywoWNNRbhoD0BXs1P3ZEScW8W5iKrnbithIl0YH+uCmBd0QpPOA8yc82DS3BIE5Ma6FnBVUsJ7wVUDz4dvOWQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    }
+  }
+}
diff --git a/implement-shell-tools/package.json b/implement-shell-tools/package.json
new file mode 100644
index 000000000..e49468b75
--- /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": "^14.0.2"
+  }
+}
diff --git a/implement-shell-tools/wc/wc.js b/implement-shell-tools/wc/wc.js
new file mode 100644
index 000000000..0d0248b15
--- /dev/null
+++ b/implement-shell-tools/wc/wc.js
@@ -0,0 +1,53 @@
+
+import { program } from "commander";
+import { promises as fs } from "node:fs";
+
+program
+  .option("-l", "Print only the line count")
+  .option("-w", "Print only the word count")
+  .option("-c", "Print only the byte count")
+  .argument("<paths...>", "One or more file paths");
+
+program.parse();
+
+const opts = program.opts();
+const paths = program.args;
+
+async function wcFile(path) {
+  const content = await fs.readFile(path, "utf8");
+
+  const lines = content.split("\n").length;
+  const words = content.trim().split(/\s+/).filter(Boolean).length;
+  const bytes = Buffer.byteLength(content, "utf8");
+
+  return { lines, words, bytes };
+}
+
+function formatOutput(counts, filename, opts) {
+  if (opts.l) return `${counts.lines} ${filename}`;
+  if (opts.w) return `${counts.words} ${filename}`;
+  if (opts.c) return `${counts.bytes} ${filename}`;
+
+  return `${counts.lines} ${counts.words} ${counts.bytes} ${filename}`;
+}
+
+async function main() {
+  let total = { lines: 0, words: 0, bytes: 0 };
+  let multipleFiles = paths.length > 1;
+
+  for (const path of paths) {
+    const counts = await wcFile(path);
+
+    total.lines += counts.lines;
+    total.words += counts.words;
+    total.bytes += counts.bytes;
+
+    console.log(formatOutput(counts, path, opts));
+  }
+
+  if (multipleFiles) {
+    console.log(formatOutput(total, "total", opts));
+  }
+}
+
+main();
diff --git a/individual-shell-tools/awk/script-01.sh b/individual-shell-tools/awk/script-01.sh
index 8db4390af..e33ee9a5d 100755
--- a/individual-shell-tools/awk/script-01.sh
+++ b/individual-shell-tools/awk/script-01.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output just the names of each player in `scores-table.txt`.
+awk '{print $1}' scores-table.txt
 # Your output should contain 6 lines, each with just one word on it.
diff --git a/individual-shell-tools/awk/script-02.sh b/individual-shell-tools/awk/script-02.sh
index 5956be9bd..a71a90314 100755
--- a/individual-shell-tools/awk/script-02.sh
+++ b/individual-shell-tools/awk/script-02.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output the names of each player, as well as their city.
+awk '{print $1, $2}' scores-table.txt
 # Your output should contain 6 lines, each with two words on it, separated by a space.
diff --git a/individual-shell-tools/awk/script-03.sh b/individual-shell-tools/awk/script-03.sh
index af7c6e8b9..c249fea2d 100755
--- a/individual-shell-tools/awk/script-03.sh
+++ b/individual-shell-tools/awk/script-03.sh
@@ -3,5 +3,6 @@
 set -euo pipefail
 
 # TODO: Write a command to output just the names of each player along with the score from their first attempt.
+awk '{print $1,$3}' scores-table.txt
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 1".
diff --git a/individual-shell-tools/awk/script-04.sh b/individual-shell-tools/awk/script-04.sh
index bf15703c7..abcfa4593 100755
--- a/individual-shell-tools/awk/script-04.sh
+++ b/individual-shell-tools/awk/script-04.sh
@@ -3,5 +3,6 @@
 set -euo pipefail
 
 # TODO: Write a command to output just the names of each player in London along with the score from their last attempt.
+awk '$2== "London" {print $1,$(NF) }' scores-table.txt
 # Your output should contain 3 lines, each with one word and one number on it.
 # The first line should be "Ahmed 4".
diff --git a/individual-shell-tools/awk/script-05.sh b/individual-shell-tools/awk/script-05.sh
index d1680cb02..f84b16b3f 100755
--- a/individual-shell-tools/awk/script-05.sh
+++ b/individual-shell-tools/awk/script-05.sh
@@ -3,5 +3,6 @@
 set -euo pipefail
 
 # TODO: Write a command to output just the names of each player along with the number of times they've played the game.
+awk '{print $1,NF-2}' scores-table.txt
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 3".
diff --git a/individual-shell-tools/awk/script-06-stretch.sh b/individual-shell-tools/awk/script-06-stretch.sh
index 0201e6378..89fa135b3 100755
--- a/individual-shell-tools/awk/script-06-stretch.sh
+++ b/individual-shell-tools/awk/script-06-stretch.sh
@@ -5,4 +5,5 @@ set -euo pipefail
 # NOTE: This is a stretch exercise - it is optional.
 
 # TODO: Write a command to output the total of adding together all players' first scores.
+awk '{sum+= $3} END {print sum}' scores-table.txt
 # Your output should be exactly the number 54.
diff --git a/individual-shell-tools/awk/script-07-stretch.sh b/individual-shell-tools/awk/script-07-stretch.sh
index 3f7155880..559817344 100755
--- a/individual-shell-tools/awk/script-07-stretch.sh
+++ b/individual-shell-tools/awk/script-07-stretch.sh
@@ -5,5 +5,6 @@ set -euo pipefail
 # NOTE: This is a stretch exercise - it is optional.
 
 # TODO: Write a command to output just the names of each player along with the total of adding all of that player's scores.
+awk ' {s=0; for(i=3; i<=NF; i++) s+=$i; print $1, s}' scores-table.txt
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 15". The second line should be "Basia 37"
diff --git a/individual-shell-tools/cat/script-01.sh b/individual-shell-tools/cat/script-01.sh
index c85053e0f..682b379b6 100755
--- a/individual-shell-tools/cat/script-01.sh
+++ b/individual-shell-tools/cat/script-01.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output the contents of the helper-1.txt file inside the helper-files directory to the terminal.
+cat ../helper-files/helper-1.txt
 # The output of this command should be "Once upon a time...".
diff --git a/individual-shell-tools/cat/script-02.sh b/individual-shell-tools/cat/script-02.sh
index 01bbd5eab..8fa1ffefe 100755
--- a/individual-shell-tools/cat/script-02.sh
+++ b/individual-shell-tools/cat/script-02.sh
@@ -3,6 +3,8 @@
 set -euo pipefail
 
 # TODO: Write a command to output the contents of all of the files inside the helper-files directory to the terminal.
+cat ../helper-files/helper-*.txt
+
 # Make sure you are only calling `cat` once.
 #
 # The output of this command should be:
diff --git a/individual-shell-tools/cat/script-03.sh b/individual-shell-tools/cat/script-03.sh
index 37573b0c1..22338dbee 100755
--- a/individual-shell-tools/cat/script-03.sh
+++ b/individual-shell-tools/cat/script-03.sh
@@ -3,6 +3,8 @@
 set -euo pipefail
 
 # TODO: Write a command to output the contents of the file `helper-3.txt` inside the helper-files directory to the terminal.
+cat -n ../helper-files/helper-3.txt
+
 # This time, we also want to see the line numbers in the output.
 #
 # The output of this command should be something like:
diff --git a/individual-shell-tools/cat/script-04-stretch.sh b/individual-shell-tools/cat/script-04-stretch.sh
index 00fe3c48b..8d74f82b6 100755
--- a/individual-shell-tools/cat/script-04-stretch.sh
+++ b/individual-shell-tools/cat/script-04-stretch.sh
@@ -5,6 +5,7 @@ set -euo pipefail
 # NOTE: This is a stretch exercise - it is optional.
 
 # TODO: Write a command to output the contents of all of the files in the helper-files directory to the terminal.
+cat  ../helper-files/helper-1.txt ../helper-files/helper-2.txt ../helper-files/helper-3.txt |awk '{print NR,$0}'
 # We also want to see the line numbers in the output, but we want line numbers not to reset at the start of each file.
 #
 # The output of this command should be something like:
diff --git a/individual-shell-tools/grep/script-01.sh b/individual-shell-tools/grep/script-01.sh
index fb05f42f2..c4f3a4d4b 100755
--- a/individual-shell-tools/grep/script-01.sh
+++ b/individual-shell-tools/grep/script-01.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt said by the Doctor.
+grep "^Doctor" dialogue.txt
 # The output should contain 6 lines.
diff --git a/individual-shell-tools/grep/script-02.sh b/individual-shell-tools/grep/script-02.sh
index df6f85640..505da8ec6 100755
--- a/individual-shell-tools/grep/script-02.sh
+++ b/individual-shell-tools/grep/script-02.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt that contains the word Doctor (regardless of case).
+grep -i "Doctor" dialogue.txt
 # The output should contain 9 lines.
diff --git a/individual-shell-tools/grep/script-03.sh b/individual-shell-tools/grep/script-03.sh
index 5383fe578..82e5f8a60 100755
--- a/individual-shell-tools/grep/script-03.sh
+++ b/individual-shell-tools/grep/script-03.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output the number of lines in dialogue.txt that contain the word Doctor (regardless of case).
+grep -ic "Doctor" dialogue.txt
 # The output should be exactly the number 9.
diff --git a/individual-shell-tools/grep/script-04.sh b/individual-shell-tools/grep/script-04.sh
index 80ee04776..01076d38e 100755
--- a/individual-shell-tools/grep/script-04.sh
+++ b/individual-shell-tools/grep/script-04.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt that does not contain the word "Hello" (regardless of case).
+grep -vi "Hello" dialogue.txt
 # The output should contain 10 lines.
diff --git a/individual-shell-tools/grep/script-05.sh b/individual-shell-tools/grep/script-05.sh
index 1eb538185..c205ba902 100755
--- a/individual-shell-tools/grep/script-05.sh
+++ b/individual-shell-tools/grep/script-05.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output every line in dialogue.txt that contains the string "cure", as well as the line before that line.
+grep -i -B 1 "cure" dialogue.txt 
 # The output should contain two pairs of two lines of text (with a separator between them).
diff --git a/individual-shell-tools/grep/script-06.sh b/individual-shell-tools/grep/script-06.sh
index 5670e3b6c..25d1d56be 100755
--- a/individual-shell-tools/grep/script-06.sh
+++ b/individual-shell-tools/grep/script-06.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output the name of every `.txt` file in this directory which contains a line of dialogue said by the Doctor.
+grep -l "Doctor" *.txt
 # The output should contain two filenames.
diff --git a/individual-shell-tools/grep/script-07.sh b/individual-shell-tools/grep/script-07.sh
index 9670ebad9..f187b3c04 100755
--- a/individual-shell-tools/grep/script-07.sh
+++ b/individual-shell-tools/grep/script-07.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output, for each `.txt` file in this directory, how many lines of dialogue the Doctor has.
+grep -c  "^Doctor" *.txt
 # The output should show that dialogue.txt contains 6 lines, dialogue-2.txt contains 2, and dialogue-3.txt contains 0.
diff --git a/individual-shell-tools/ls/script-01.sh b/individual-shell-tools/ls/script-01.sh
index 241b62f5e..044af3619 100755
--- a/individual-shell-tools/ls/script-01.sh
+++ b/individual-shell-tools/ls/script-01.sh
@@ -12,4 +12,5 @@ if [[ "${script_dir}" != "$(pwd)" ]]; then
 fi
 
 # TODO: Write a command to list the files and folders in this directory.
+ls
 # The output should be a list of names including child-directory, script-01.sh, script-02.sh, and more.
diff --git a/individual-shell-tools/ls/script-02.sh b/individual-shell-tools/ls/script-02.sh
index d0a5a10f4..33e4b10bc 100755
--- a/individual-shell-tools/ls/script-02.sh
+++ b/individual-shell-tools/ls/script-02.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command which lists all of the files in the directory named child-directory.
+ls child-directory
 # The output should be a list of names: helper-1.txt, helper-2.txt, helper-3.txt.
diff --git a/individual-shell-tools/ls/script-03.sh b/individual-shell-tools/ls/script-03.sh
index 781216d21..0dc1c2f8a 100755
--- a/individual-shell-tools/ls/script-03.sh
+++ b/individual-shell-tools/ls/script-03.sh
@@ -3,5 +3,6 @@
 set -euo pipefail
 
 # TODO: Write a command which _recursively_ lists all of the files and folders in this directory _and_ all of the files inside those folders.
+ls -R
 # The output should be a list of names including: child-directory, script-01.sh, helper-1.txt (and more).
 # The formatting of the output doesn't matter.
diff --git a/individual-shell-tools/ls/script-04.sh b/individual-shell-tools/ls/script-04.sh
index 72f3817b3..f5849b255 100755
--- a/individual-shell-tools/ls/script-04.sh
+++ b/individual-shell-tools/ls/script-04.sh
@@ -14,10 +14,12 @@ touch "${script_dir}/child-directory/helper-3.txt"
 echo "First exercise (sorted newest to oldest):"
 
 # TODO: Write a command which lists the files in the child-directory directory, one per line, sorted so that the most recently modified file is first.
+ls -1t child-directory
 # The output should be a list of names in this order, one per line: helper-3.txt, helper-1.txt, helper-2.txt.
 
 
 echo "Second exercise (sorted oldest to newest):"
 
 # TODO: Write a command which does the same as above, but sorted in the opposite order (oldest first).
+ls -1tr child-directory
 # The output should be a list of names in this order, one per line: helper-2.txt, helper-1.txt, helper-3.txt.
diff --git a/individual-shell-tools/sed/script-01.sh b/individual-shell-tools/sed/script-01.sh
index 3eba6fa4d..9edc8efe3 100755
--- a/individual-shell-tools/sed/script-01.sh
+++ b/individual-shell-tools/sed/script-01.sh
@@ -3,5 +3,6 @@
 set -euo pipefail
 
 # TODO: Write a command to output input.txt with all occurrences of the letter `i` replaced with `I`.
+sed  's/i/I/g' input.txt
 # The output should contain 11 lines.
 # The first line of the output should be: "ThIs Is a sample fIle for experImentIng with sed.".
diff --git a/individual-shell-tools/sed/script-02.sh b/individual-shell-tools/sed/script-02.sh
index abdd64d06..e7ec3f486 100755
--- a/individual-shell-tools/sed/script-02.sh
+++ b/individual-shell-tools/sed/script-02.sh
@@ -3,5 +3,6 @@
 set -euo pipefail
 
 # TODO: Write a command to output input.txt with numbers removed.
+sed 's/[0-9]//g' input.txt
 # The output should contain 11 lines.
 # Line 6 of the output should be " Alisha".
diff --git a/individual-shell-tools/sed/script-03.sh b/individual-shell-tools/sed/script-03.sh
index dd284a296..4be42f03b 100755
--- a/individual-shell-tools/sed/script-03.sh
+++ b/individual-shell-tools/sed/script-03.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output input.txt removing any line which contains a number.
+sed '/[0-9]/d' input.txt
 # The output should contain 6 lines.
diff --git a/individual-shell-tools/sed/script-04.sh b/individual-shell-tools/sed/script-04.sh
index 0052ac6c4..fcac5ae0d 100755
--- a/individual-shell-tools/sed/script-04.sh
+++ b/individual-shell-tools/sed/script-04.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output input.txt replacing every occurrence of the string "We'll" with "We will".
+sed "s/We'll/We will/g" input.txt
 # The output should contain 11 lines.
diff --git a/individual-shell-tools/sed/script-05.sh b/individual-shell-tools/sed/script-05.sh
index 2dcc91a0c..7bdf0d5c9 100755
--- a/individual-shell-tools/sed/script-05.sh
+++ b/individual-shell-tools/sed/script-05.sh
@@ -3,6 +3,7 @@
 set -euo pipefail
 
 # TODO: Write a command to output input.txt with one change:
+sed 's/^\([0-9]\+\) \(.*\)/\2 \1/' input.txt
 # If a line starts with a number and a space, make the line instead end with a space and the number.
 # So line 6 which currently reads "37 Alisha" should instead read "Alisha 37".
 # The output should contain 11 lines.
diff --git a/individual-shell-tools/sed/script-06.sh b/individual-shell-tools/sed/script-06.sh
index 0b9390170..3f4a6697b 100755
--- a/individual-shell-tools/sed/script-06.sh
+++ b/individual-shell-tools/sed/script-06.sh
@@ -3,6 +3,7 @@
 set -euo pipefail
 
 # TODO: Write a command to output input.txt with one fix:
+sed 's/,\([^ ]\)/, \1/g' input.txt
 # If a comma in input.txt is not followed by a space, add a space after.
 # If there is already a space after a comma, do not add an additional space.
 # The output should contain 11 lines.
diff --git a/individual-shell-tools/wc/script-01.sh b/individual-shell-tools/wc/script-01.sh
index c9dd6e5df..c56cf389b 100755
--- a/individual-shell-tools/wc/script-01.sh
+++ b/individual-shell-tools/wc/script-01.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output the number of words in the file helper-files/helper-3.txt.
+wc -w < ../helper-files/helper-3.txt
 # The output should include the number 19. The output should not include the number 92.
diff --git a/individual-shell-tools/wc/script-02.sh b/individual-shell-tools/wc/script-02.sh
index 8feeb1a62..75365787c 100755
--- a/individual-shell-tools/wc/script-02.sh
+++ b/individual-shell-tools/wc/script-02.sh
@@ -3,4 +3,5 @@
 set -euo pipefail
 
 # TODO: Write a command to output the number of lines in the file helper-files/helper-3.txt.
+wc -l < ../helper-files/helper-3.txt
 # The output should include the number 3. The output should not include the number 19.
diff --git a/individual-shell-tools/wc/script-03.sh b/individual-shell-tools/wc/script-03.sh
index 6b2e9d3d1..a7cd9b352 100755
--- a/individual-shell-tools/wc/script-03.sh
+++ b/individual-shell-tools/wc/script-03.sh
@@ -3,6 +3,7 @@
 set -euo pipefail
 
 # TODO: Write a command to output the number of lines, words, and characters in all of the files inside the helper-files directory.
+wc -lwc ../helper-files/helper-1.txt ../helper-files/helper-2.txt ../helper-files/helper-3.txt
 # The output should be something like:
 #        1       4      20 ../helper-files/helper-1.txt
 #        1       7      39 ../helper-files/helper-2.txt