Downloads the entire history of all of your feeds on Google Reader. Data is formatted in JSON, just the way Google Reader uses it. The data for each feed is placed in its own file.

export_reader_history.sh

#!/usr/bin/env bash

if [ -z "$1" ]; then
  echo "Usage: $0 /path/to/your/subscriptions.xml"
  exit 1
fi

grep -o 'xmlUrl="[^"]\+' "$1" | cut -d'"' -f2 | while read FEED; do
  FEED_URL="$(perl -MURI::Escape -e 'print uri_escape($ARGV[0]);' "$FEED")"
  URL="https://www.google.com/reader/api/0/stream/contents/feed/${FEED_URL}?r=n&n=99999"
  FILENAME=$(echo -n "$FEED" | sed -e 's|https\?://\(www\.\)\?||' -e 's|[/.]|_|g' -e 's|_\+$||g')
  echo -e "$FEED\n=> $FILENAME"
  curl -s -L $URL | tr -d '\n' > $FILENAME
done