Obligatory warning: This script has been designated as an obsoleted "Retro Script". There is no guarantee that it will function as described with modern versions of iTunes and/or macOS. If used in its current form it may not work at all without modification and, at worst, it may corrupt or destroy data.
iTunes will stop updating a podcast if you have not listened to at least one of its episodes in five days. This script will batch-update every podcast subscription so you don't have to manually update each one individually.
I have posted instructions on how to create a launchd agent to run this script automatically and invisibly in the background to ensure that your Podcasts are always updated.
Possible iTunes bug (July 17, 2014): Looks like the iTunes AppleScript command updatePodcast command is broken as of iTunes 11.
downloaded 29m 24s ago
Title Cap various track tags, featuring editable exceptions lists
downloaded 40m 29s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 42m 10s ago
Renumber playlist tracks to play order
downloaded 45m 51s ago
Renumber order of selected tracks
downloaded 1h 2m 48s ago
Convert selected tracks and export the converted files to a new folder
downloaded 1h 8m 58s ago
Removes leading and trailing space characters from chosen tags in selected tracks