Bash: Print YouTube RSS Feed: read, input, printf

Use Unix shell to print YouTube RSS feed URL

After executing Bash script, user is prompted to input YouTube channel hash, then URL for Youtube RSS feed prints in Unix shell. As demonstrated below:

# bash youtube_feed.sh 
Paste YouTube channel hash: UCJyVgjrb0nQFdxL-3X98SfA
https://www.youtube.com/feeds/videos.xml?channel_id=UCJyVgjrb0nQFdxL-3X98SfA

The YouTube channel hash is easy to find. The following link example displays the type of URL which contains the channel hash, e.g. UCJyVgjrb0nQFdxL-3X98SfA

https://www.youtube.com/channel/UCJyVgjrb0nQFdxL-3X98SfA/videos

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