Implement cat tool with -n and -b flags

Author: RomanSanaye

implement-shell-tools/cat/cat*.js

@@ -0,0 +1,6 @@
+const fs = require("fs");
+const folderPath = "./sample-files";
+const content = fs.readdirSync(folderPath);
+
+const txtFiles = content.filter((file) => file.endsWith(".txt"));
+process.stdout.write(txtFiles.join("\n"));

implement-shell-tools/cat/cat-b.js

@@ -0,0 +1,12 @@
+const fs = require("fs");
+const filePath = "./sample-files/3.txt";
+const content = fs.readFileSync(filePath, "utf-8");
+
+let count = 1;
+const numberLines = content.split("\n").map((line) => {
+  if (line.trim() !== "") {
+    return `${count++} ${line.trim()}`;
+  }
+  return "";
+});
+process.stdout.write(numberLines.join("\n"));

implement-shell-tools/cat/cat-n*txt.js

@@ -0,0 +1,9 @@
+const fs = require("fs");
+const folderPath = "./sample-files";
+const content = fs.readdirSync(folderPath);
+
+const txtFiles = content.filter((file) => file.endsWith(".txt"));
+const numberedLine = txtFiles.map((line, index) => {
+  return `${index + 1} ${line}`;
+});
+process.stdout.write(numberedLine.join("\n"));

implement-shell-tools/cat/cat-n.js

@@ -0,0 +1,8 @@
+const fs = require("fs");
+const filePath = "./sample-files/1.txt";
+const content = fs.readFileSync(filePath, "utf-8");
+
+const lineNumber = content.split("\n").map((line, index) => {
+  return `${index + 1} ${line}`;
+});
+process.stdout.write(lineNumber.join("\n"));

implement-shell-tools/cat/cat.js

@@ -0,0 +1,6 @@
+const fs = require("fs");
+const filePath = "./sample-files/1.txt";
+
+const content = fs.readFileSync(filePath, "utf-8");
+
+process.stdout.write(content);