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 3m 57s ago
Sort purchased tracks into discrete playlists by name or Apple ID
downloaded 2h 14m 17s ago
Change file type to make selected AACs bookmarkable
downloaded 2h 14m 23s ago
Perform search-and-replace on text in your choice of tags
downloaded 2h 14m 36s ago
Set choice of various number tags of selected tracks incrementally
downloaded 2h 14m 44s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 2h 14m 59s ago
Applet assists with swapping, copying, appending data between track tags