Stuck at #ni6: cat: /tmp/foo/f85: No such file or directory

Challenges
1

I’m doing the Build your own shell using javascript and stuck at #ni6. I have managed to implement the single quote issue in echo command. But i can’t figure out the cat command.
I think the task is to make

cat ‘/tmp/quz/f 46’ ‘/tmp/quz/f 14’ ‘/tmp/quz/f 3’

into

cat ‘/tmp/quz/f46’ ‘/tmp/quz/f14’ ‘/tmp/quz/f3’ ]

and execute.
I tried to execute the cat command through the node child-process execFileSync() method. It shows No such file or directory

Here are my logs:

ni6
ni6846×707 17.1 KB

And here’s a snippet of my code:

ni6-code
ni6-code766×192 11.3 KB

3

For the cat command, it is a binary available at

/usr/bin/cat

I don’t think you have to implement your own cat command

1 Like
4

How should i approach it, can you be more specific.

5

Hi @anoopksurendran1112, you can reuse the logic implemented in #ip1 Run a program. Let me know if you need further clarification.

7

This is the code i come up with for #ip1 run a program.

function programRun(answer){
  const fileName = answer.split(" ")[0];
  const argument = answer.split(" ").slice(1);
  const pathEnv = process.env.PATH;
  let found = false;
  const pathDir = pathEnv.split(":");
  for (const filepath of pathDir){
    const fullPath = path.join(filepath,fileName);
    if(fs.existsSync(fullPath) && fs.statSync(fullPath).isFile()){
      execFileSync(fileName, argument, { encoding: 'utf-8', stdio: 'inherit' })
      found = true;
      break;
    }
  }
  if(found == false){
    console.log(answer+": command not found");
  }
}

I tried to use the filepath given in the cat command as the fileName in the execFileSync, and it didnt work

function catCommand(answer){
  let arg = answer.split("cat ")[1]
  arg = arg.match(/'([^']+)'/g).map(path => path.slice(1, -1));
  const filepaths = arg.map(path => path.replace(/\s+/g, ""));
  filepaths.forEach(files => {
    execFileSync(files, [], { encoding: 'utf-8', stdio: 'inherit' })
  });
}

It shows:

[your-program] $ cat '/tmp/baz/f 64' '/tmp/baz/f 88' '/tmp/baz/f 10'
[your-program] node:internal/readline/emitKeypressEvents:74
[tester::#NI6] Output does not match expected value.
[tester::#NI6] Expected: "blueberry mango.mango blueberry.strawberry pear."
[tester::#NI6] Received: "node:internal/readline/emitKeypressEvents:74"
[your-program] throw err;
[your-program] ^
[your-program] <ref *1> Error: spawnSync /tmp/baz/f64 ENOENT