How to parse rss-feeds / xml in a shell script
I'd like to parse rss feeds and download podcasts on my ReadyNas which is running 24/7 anyway.
So I'm thinking about having a shell script checking periodically the feeds and spawning wget to download the files.
What is the best way to do the parsing?
Sometimes a simple one liner with shell standard commands can be enough for this:
wget -q -O- "http://www.rss-specifications.com/rss-podcast.xml" | grep -o '<enclosure url="[^"]*' | grep -o '[^"]*$' | xargs wget -c
Sure this does not work in every case, but it's often good enough.
Do you have access to awk? Maybe you could use XMLGawk
But is there a port to ReadyNas NV+ available?
I've wrote the following simple script for downloading XML from Amazon S3, so it would be useful for parsing different kind of XML files:
#!/bin/bash # # Download all files from the Amazon feed # # Usage: # ./dl_amazon_feed_files.sh http://example.s3.amazonaws.com/ # Note: Don't forget about slash at the end # wget -qO- "$1" | grep -o '<Key>[^<]*' | grep -o "[^>]*$" | xargs -I% -L1 wget -c "$1%"
This is similar approach to @leo answer.
You can use xsltproc from libxml2 and write a simple xsl stylesheet that parses the rss and outputs a list of links.