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 24m 40s ago
Exports and then re-imports selected tracks' artwork
downloaded 1h 34m 35s ago
Assists with finding truncated iTunes Match tracks
downloaded 1h 58m 52s ago
Displays files in iTunes Media folder not in iTunes track library
downloaded 2h 55m 25s ago
Perform search-and-replace on text in your choice of tags
downloaded 3h 4m 47s ago
Remove iTunes tracks disassociated from files
downloaded 4h 10m 52s ago
Title Cap various track tags, featuring editable exceptions lists