How to run exec() without being a noob

execsarescary.js

// this is inside a for loop (let path = 0; path < list.length; path++)
// exec(command).on("close", () => this function runs when the process has finished successfully)
// you can ignore the commands specifically they're running fine

exec(`ffmpeg -y -i ${list[path]} -vf "setpts=1.25*PTS" -r 29.97 ${toEncodePath}`)
  .on("close",() => {
    console.log(`Encoded ${path} file.`)

    // path goes like this: 2 1 0 because the exec(s) finish at different times

    // this condition is kinda useless because path should go 0 1 2 BUT since it's loading diff times, 
    // this runs in the first iteration of the for loop and hence doesn't work at all

    if (path === list.length) {
      console.log('STARTED CONCATTING')
      const subprocessCmd = `ffmpeg -f concat -i public/inputs.txt -c copy public/generated/output.mp4`

      exec(subprocessCmd).on("close", () => console.log('---------------- PROCESS FINISHED AND TERMINATED ----------------'))
    }
})