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London | SDC-Nov-25 | Emiliano Uruena | Sprint 3 | Implement Shell Tools #251

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London | SDC-Nov-25 | Emiliano Uruena | Sprint 3 | Implement Shell Tools #251

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8fb3596
Numeric Systems: answers
Emilianouz Nov 11, 2025
a5dec6c
Implementing shell tools so that they behave like the real versions o…
Emilianouz Nov 25, 2025
555dd44
Delete number-systems/README.md
Emilianouz Nov 25, 2025
644e962
Remove commented-out path variable
Emilianouz Feb 11, 2026
b309bfe
Indentation cat-commander.js for improved readability
Emilianouz Feb 11, 2026
618c111
Remove unused glob import from wc-commander.js
Emilianouz Feb 11, 2026
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54 changes: 54 additions & 0 deletions implement-shell-tools/cat/cat-commander.js
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import { program } from "commander";
import { promises as fs } from "node:fs";
import process from "node:process";

program
.name("read-files-content")
.description("Read the content of a file (simulating cat command)")
.option("-n, --number","Number of lines")
.option("-b","Number of no-blanks lines")
.argument("<path...>","The file path to process"); //file

program.parse();

const argv = program.args;

if (argv.length === 0) {
console.error(`Expected file path(s),passed but got ${argv.length}.`);
process.exit(1);
}

for (const path of argv) {
const option = program.opts();
const content = await fs.readFile(path, "utf-8");
if (option.number) {
// split content
let lines = content.split(/\n/);
// removes last line
if (lines[lines.length - 1] === "") {
lines = lines.slice(0, -1);
}
lines
.map((line, index) => `${(index + 1).toString().padStart(6)}\t${line}`)
.forEach((line) => console.log(line));
} else if (option.b) {
let lines = content.split("\n");
let linesCounter = 0;
if (lines[lines.length - 1] === "") {
lines = lines.slice(0, -1);
}
lines
.map((line) => {
if (line.trim().length > 0) {
linesCounter++;
return `${linesCounter.toString().padStart(6)}\t${line}`;
} else {
return `${line}`;
}
})
.forEach((line) => console.log(line));
} else {
const output = content.endsWith("\n") ? content.slice(0, -1) : content;
console.log(output);
}
}
36 changes: 36 additions & 0 deletions implement-shell-tools/ls/ls-commander.js
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import { program } from "commander";
import { promises as fs } from "node:fs";
import process from "node:process";

program
.name("list-files")
.description("List files in a directory")
.option("-1", "Show line by line")
.option("-a, --all", "Show hidden files")
.argument("[paths...]", "The directory paths",["."]);

program.parse();

const argv = program.args;

if (argv.length != 1){
console.error(`Expected exactly 1 argument (a path) to be passed but got ${argv.length}`);
process.exit(1);
}
const dirPath = argv[0];
const options = program.opts();

const entries = await fs.readdir(dirPath)

const listFiles = entries.map((entry) => `${entry.padStart(6)}` )
const noHidden = listFiles.filter(name => !name.startsWith('.'));

if (options.all && options[1]){
console.log(listFiles.join('\n'));
} else if (options.all) {
console.log(listFiles.join(' '));
} else if (options[1]){
console.log(noHidden.join('\n'));
} else {
console.log(noHidden.join(' '));
}
60 changes: 60 additions & 0 deletions implement-shell-tools/wc/wc-commander.js
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import {program} from "commander";
import { promises as fs } from "node:fs";
import process from "node:process";

program
.name("content counter")
.description("Counts lines, words, or characters in a file or files of a directory.")
.option("-l,--lines","Options for l:Lines.")
.option("-w,--words","Options for w:words.")
.option("-c","Options for c:characters.")
.argument("<path...>","The file or directory to process");

program.parse();

const argv = program.args;

const options = program.opts();

const result = [];
let totalLines = 0;
let totalWords = 0;
let totalChars = 0;

for (const file of argv){

//1. Read each file

const content = await fs.readFile(file,"utf-8");
// 2. calculate values
const lines = content.split(/\n/g).length - 1 ;
const words = content.trim().split(/\s+/).length;
const chars = content.split("").length;
// variable to pile up final line results according options
const thisLine = [];
if (options.lines){ thisLine.push(lines.toString().padStart(8)) };
if (options.words){ thisLine.push(words.toString().padStart(8)) };
if (options.c){ thisLine.push(chars.toString().padStart(8)) };
if (!options.lines && !options.words && !options.c){ thisLine.push(lines.toString().padStart(8),words.toString().padStart(8),chars.toString().padStart(8)) };
result.push(`${thisLine.join("")} ${file}`)
// 3. add results
// variables to accumulate the total
totalLines += lines;
totalWords += words;
totalChars += chars;
// 4. add total results if several files
}
if (argv.length>1){
const finalLine = [];
finalLine.push(totalLines.toString().padStart(8)),
finalLine.push(totalWords.toString().padStart(8)),
finalLine.push(totalChars.toString().padStart(8));
result.push(`${finalLine.join("")} total`)
}
// 5. show results
const output = result.join('\n');
console.log(output)




65 changes: 0 additions & 65 deletions number-systems/README.md
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