ClipGrab is a free downloader and converter for YouTube, Vimeo, Dailymotion and many other online video sites. ClipGrab is a multi-platform, GPL v3 licensed software for downloading videos from popular websites like youtube,Vimeo or Dailymotion. It also provides the possibility to convert the downloaded files to other file formats like MP3, MPEG4, OGG Theroa or WMV.
commands on terminal:-
enjoy video downloading…. 🙂