From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jed Brown <jed@59A2.org>
Subject: Find/prune local branches after upstream branch is deleted?
Date: Fri, 19 Apr 2013 12:11:38 -0500
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Consider this workflow:

$ git checkout -b my/branch
hack, commit, ...
$ git push -u origin my/branch

The branch gets reviewed, merged, and eventually deleted upstream.  The
remote tracking branch gets pruned via 'git fetch --prune' or 'git
remote prune', but that leaves my local branch with an upstream that has
been deleted.  Is there a good way to discover this so I can prune my
local branches?

$ git branch -vv
  my/branch        6d32ec0 [origin/my/branch] The commit message

I can script it, but this seems like a pretty common thing.