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 7m 10s ago
Locates pairs of track entries pointing to the same file
downloaded 1h 0m 30s ago
Perform search-and-replace on text in your choice of tags
downloaded 1h 5m 44s ago
Display, create text file listing info of dead tracks
downloaded 1h 14m 10s ago
Convert selected tracks and export the converted files to a new folder
downloaded 1h 21m 43s ago
Prefix each selected track's Song Name with the number of its order in the selection.
downloaded 1h 21m 58s ago
Batch-change the Album Rating for the albums of selected tracks