Questions[downloaders](ubuntu)

I am trying to open Clipgrab but clipgrab.pro not open with run software i can't understand what I missed:

I also tried to run using:

qmake clipgrab.pro && make

but got no response. What can I do?

I want to write a bash function to both start downloading a file and open it in a video player; I don't know how to get the path of the file being downloaded though:

function dl-and-stream() {
  aria2c "$1" &
  sleep 30
  mpv #What to put here
}

PS: This is not my only use case, and I’m aware of --out, but I like to keep the original file name.

Update: My use cases can be fulfilled via --on-download-complete (and other event handlers), but I still prefer not using that if possible. (Because they need the creation of additional script files.)

I want to change default downloader of Firefox because it is very slow. I want to set uGet. I installed uGet downloader, but when I click some download link it start with Firefox's own downloader. What do I have to do?

Is there a program/app for Ubuntu that allows to download several images from a page? To be exact, I want to get some pictures from the site

http://www.cookingforengineers.com/

Some of the recepies are an endless list of pics and I want to get them all together.

I tried DownThemAll with Firefox, but 1. I could only get the thumbnails and 2. I use Chrome now.

After I used aria2 to download a link, in its download link's info there is CN:1!

[#678707 16MiB/22MiB(73%) CN:1 DL:45KiB ETA:2m15s]

What does it mean?