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Hi, I'm new to Linux >so new I'm still mostly on windows
I'm quite sure that Linux can do everything and more than windows, but finding out how to grab the reins is a bit of a learning curve so far..
Anyway, here's the story..
With windows I've been using FreeDownloadManager (and video.google) to download youtube videos while on dialup, it's a really great program >it downloads lists of videos and then converts them from .flv to .avi or .mpg, and it'll hang up the phone and switch off the computer when it's finnished.. great for while I sleep and no-one needs the phone
ffmpeg can transcode most .flv videos downloaded from youtube, but not all - some seem to have a format ffmpeg can't understand.
The program poweroff can be used to shut down the system. If that doesn't exist, the command shutdown -P now will do the same thing.
Depending on how your dialup system is set up you will be able to hang up from a script too.
It is possible to combine all these into a script which will receive a list of youtube URLs to download and when it is done, poweroff your system.
There are some things to be careful of... the poweroff program needs root privileges to run, but you probably shouldn't run yourtube-dl and ffmpeg as root... To make it possible to automate the poweroff without running the whole script as root, you should set up sudo so your user can call poweroff with sudo without having to enter a password.
Once this is done, you can construct a script to process a list of URLs and shut down the machine when done.