youtube_downloader.sh

#!/bin/bash


# converts and saves youtube video to mp3
function convert_to_mp3() {
      #ensure the video is downloaded to the correct location (youtube folder in Downloads)

        if [ -d "~/Downloads/youtube" ]; then
                cd ~/Downloads/youtube
        else
        # if there is no youtube folder in Downloads, make one
                mkdir ~/Downloads/youtube
                cd ~/Downloads/youtube
        fi
        #download youtube audio into the folder ~/Downloads/youtube
        youtube-dl --extract-audio --audio-format mp3 $1
}

#prints a kitty!!
function kitty() {

        echo '
                  |\__/,|   (`\
                _.|o o  |_   ) )
                -(((---(((--------'
}


#print a bird

function bird() {

        echo "
         __
        ( o>
        ///\
        \V_/_
        "
}

This shell script includes a function which enables you to save the audio from a youtube video on to your computer.

To run, you first need to source the file, which can be done from any directory so long as ~ is used before the file path:
$ source ~/.youtube_downloader.sh

Then to run the youtube converter (which can be done from any directory after sourcing), run it (with any youtube URL):
$ convert_to_mp3 https://www.youtube.com/watch?v=B7UmUX68KtE

Then look for the file in
~/Downloads/youtube

You can also run $ kitty to print a friendly kitty
or run $ bird to put a bird on it

and if you want a kitty looking at a bird, run $ bird && kitty