I built and open sourced a tool called s3_disk_util last week.  It’s meant to help cleanup disk space on your AWS bucket.  Its very similar to the linux command `du`, but for s3.

Here’s how it works:

  kevinowocki@local /Users/kevinowocki/Desktop/s3_disk_utils~ % python3 du.py --depth=1 --bucket=BUCKETNAME
BUCKETNAME
(Cloudwatch bucket size estimate: 22.7GiB)
  / : 22.7GiB
 - DIR1/ : 22.6GiB
 - DIR2/ : 452.6KiB
 - DIR3/ : 1.6MiB
 - DIR4/ : 119.0MiB
 - DIR5/ : 0.0B
kevinowocki@local /Users/kevinowocki/Desktop/s3_disk_util~ % python3 du.py --depth=2 --bucket=BUCKETNAME
BUCKETNAME
(Cloudwatch bucket size estimate: 22.7GiB)
  / : 22.7GiB
 - DIR1/ : 22.6GiB
 -- DIR1/SUBDIR1/ : 31.1MiB
 -- DIR1/SUBDIR2/ : 12.7GiB
 -- DIR1/SUBDIR3/ : 0.0B
 -- DIR1/SUBDIR4/ : 9.9GiB
 - DIR2/ : 452.6KiB
 -- DIR2/SUBDIR1/ : 429.5KiB
 - DIR3/ : 1.6MiB
 -- DIR3/SUBDIR1/ : 254.4KiB
 - DIR4/ : 119.0MiB
 - DIR5/ : 0.0B

Check it out on github here.