NW | 2026-mar-sdc | Zabihollah Namazi | Sprint 3 | implement shell tools

implement-shell-tools/cat/cat.js

@@ -0,0 +1,45 @@
+import { promises as fs } from "node:fs";
+
+// get all command line arguments after "node cat.js" - like -n or -b
+const args = process.argv.slice(2);
+
+// put them in variables
+const showAllNumbers = args.includes("-n");
+const showNonEmptyNumbers = args.includes("-b");
+
+// getting the paths of files
+const paths = args.filter(arg => arg !== "-n" && arg !== "-b");
+
+// loop over each file
+for (const path of paths) {
+  try {
+    // read file as text
+    const content = await fs.readFile(path, "utf-8");
+
+    // split them into lines
+    const lines = content.split("\n");
+
+    let lineNumber = 1; // tracks line numbers for -b and -n
+
+    lines.forEach((line) => {
+      if (showNonEmptyNumbers) {
+        // -b: number only non-empty lines
+        if (line.trim() !== "") {
+          console.log(`${lineNumber} ${line}`);
+          lineNumber++;
+        } else {
+          console.log(line); // shows empty line with no number
+        }
+      } else if (showAllNumbers) {
+        // -n: number all lines
+        console.log(`${lineNumber} ${line}`);
+        lineNumber++;
+      } else {
+        // no flags: just print line
+        console.log(line);
+      }
+    });
+  } catch (err) {
+    console.error(`Error reading file "${path}": ${err.message}`);
+  }
+}

implement-shell-tools/ls/ls.js

@@ -0,0 +1,28 @@
+import { promises as fs } from "node:fs";
+
+//getting all commands 
+const args = process.argv.slice(2);
+
+const showOnePerLine = args.includes("-1"); 
+const showAllFilesWithHidden = args.includes("-a");
+
+//current path
+const path = args.find(arg => !arg.startsWith("-")) || ".";
+// if we do console.log("path=> ",path," args=> " ,args); it will give us this =>: path=>  sample-files  args=>  [ '-1', '-a', 'sample-files' ]
+
+const direc = await fs.readdir(path)
+// if the path is <sample-files> console.log(direc) gives us =>: [ '.hidden.txt', '1.txt', '2.txt', '3.txt', 'dir' ]
+
+if(showOnePerLine && showAllFilesWithHidden){ 
+    direc.forEach(element => {
+        console.log(element)
+    })
+}
+else if(showOnePerLine){
+    const visibleFiles = direc.filter(element => !element.startsWith(".")); // filtering hidden files which starts with "."
+    visibleFiles.forEach(element => {
+        console.log(element)
+    });
+}
+
+

implement-shell-tools/wc/README.md

@@ -14,4 +14,4 @@ It must act the same as `wc` would, if run from the directory containing this RE
 
 Matching any additional behaviours or flags are optional stretch goals.
 
-We recommend you start off supporting no flags for one file, then add support for multiple files, then add support for the flags.
+We recommend you start off supporting no flags for one file, then add support for multiple files, then add support for the flags

implement-shell-tools/wc/wc.js

@@ -0,0 +1,60 @@
+import { promises as fs } from "node:fs";
+
+const args = process.argv.slice(2);
+console.log(args)
+
+const showLines = args.includes("-l");
+const showWords = args.includes("-w");
+const showChars = args.includes("-c");
+const paths = args.filter(arg => !arg.startsWith("-")) || ".";
+console.log(paths)
+
+// const direct = await fs.readdir(path);
+
+// console.log(direct);
+let totalLines = 0;
+let totalWords = 0;
+let totalchars = 0;
+
+if(showLines){
+    for (const path of paths){
+    const content = await fs.readFile(path, "utf-8"); 
+    const lines = content.split("\n").length;
+
+    totalLines += lines;
+    }
+    console.log("line: ", totalLines);
+}
+else if(showWords){
+    for (const path of paths){
+    const content = await fs.readFile(path, "utf-8");
+    const words = content.split(/\s+/).filter(Boolean).length;
+
+    totalWords += words;
+    }
+    console.log("words: ", totalWords);
+}
+else if(showChars){
+    for (const path of paths){
+    const content = await fs.readFile(path, "utf-8");
+    const char = content.length; 
+
+    totalchars += char;
+    }
+    console.log("chars", totalchars)
+}
+else{
+    for (const path of paths){
+    const content = await fs.readFile(path, "utf-8");
+    const lines = content.split("\n").length;
+    const words = content.split(/\s+/).filter(Boolean).length;
+    const char = content.length; 
+
+    totalLines += lines;
+    totalWords += words;
+    totalchars += char;
+    }
+console.log("lines: ", totalLines, " words", totalWords, " char:", totalchars)
+}
+
+