root@Machine:/home/cyber# sudo curl -L https://yt-dl.org/downloads/latest/youtube-dl -o /usr/local/bin/youtube-dl
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     3    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     3    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   582    0   582    0     0    353      0 --:--:--  0:00:01 --:--:--  568k
100 1372k  100 1372k    0     0   305k      0  0:00:04  0:00:04 --:--:--  695k
root@Machine:/home/cyber# sudo chmod a+rx /usr/local/bin/youtube-dl
root@Machine:/home/cyber# youtube-dl -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.08.05
[debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.6
[debug] Proxy map: {}
Usage: youtube-dl [options] url [url...]

youtube-dl: error: you must provide at least one URL