grumblr is a maintenance tool originally created to fix long-standing tumblr nuisances (such as no automatic tag page generation and non-normalized case in tags, etc.).
Right now grumblr is mostly for programmatic use, but it has a basic CLI:
$ pip install grumblr
$ python -m grumblr --site blog_name fetch
$ python -m grumblr --site blog_name report
Have fun grumblin!