remove-a-specific-file.js

'use strict'

const fs = require('fs')
let c = 0

// Folder to inspect
// =================
const PATH = 'artes'

// File that will be deleted
// =========================
const FILE = /_3\.png/

// Inspect folder
// =============
const inspect = f => fs.readdir(`${__dirname}/${f}`, (err, result) => err ? new TypeError(err) : verify(result, f))

// Verify file
// ===========
function verify (arr, f) {
  if (c == arr.length) {
    arr.forEach(file => {
      if (!FILE.test(file)) {
        fs.unlink(`${__dirname}/${f}/${file}`, err => {
          console.log('Deleted:', file)
        })
      }
    })
  }

  arr.forEach(file => {
    inspect(`artes/${file}/screenshot`)
  })

  c++
}

inspect(PATH)