In GNOME one can write an XML document telling the system when to change between various files to automatically change the desktop wallpaper, and then set that XML document as the wallpaper.
I have three I like to switch between, containing the schedules and playoff brackets of my favorite sports teams.
I've been using LXDE far more than I've been using GNOME these days, but LXDE won't let me set the XML as the wallpaper like GNOME does.
So after searching around a bit I thought I'd create a cronjob that would change the wallpaper every 20 minutes.
So I set up this
# m h dom mon dow command
5 * * * * pcmanfm --set-wallpaper=/home/jim/Pictures/tigers.jpg
25 * * * * pcmanfm --set-wallpaper=/home/jim/Pictures/nhl.jpg
45 * * * * pcmanfm --set-wallpaper=/home/jim/Pictures/mudhens.jpg
but it didn't do what I thought it would in changing my wallpaper automatically.
Since I had never used cronjobs before I thought I was doing something wrong in how I had it set up. Various tries to no avail.
But then I have the real problem none of the various I've treid of simply running pcmanfm --set-wallpaper or pcmanfm -w (the --help says they do the same thing) actually do anything. I've tried both with and without the = (I wasn't sure how to interperet the --help on that).
Any help you can provide would help