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I've been having trouble with this for some time. Here is what I finally came up with that seems to work, though I have very limited abilities with piping.
I'm guessing this is a poor way to achieve my goal, are there some simpler ways I could do this that would be more efficient?
$ find /home/data/cam*/* -maxdepth 0 -type d -mtime +30 \
-exec du -sm {} \;| awk '{if ( $1 > 3000 ) print $2}' | xargs rm -rf
It's pretty good actually. Assuming the /home/data/cam*/* -maxdepth 0 part is fine, and assuming your directory names don't contain newlines, I'd do it like this:
find /home/data/cam*/* -maxdepth 0 -type d -mtime +30 -exec du -sm {} + | \
awk '$1 > 3000' | cut -f 2- | xargs rm -rf
-exec du -sm {} + is an optimisation, it doesn't run du for each directory. And awk '$1 > 3000' | cut -f 2- makes sure this still works if your directory names contain spaces.
