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# Find duplicate keys in ~/.ssh/known_hosts
# Of course, we should have been more careful in the first place :)
from __future__ import division, print_function
from collections import defaultdict
import os.path
import re
hostnames_per_key = defaultdict(list)
with open(os.path.expanduser('~/.ssh/known_hosts')) as f:
for line in f:
m = re.match('(\S+)\s+(\S+\s+\S+)(.*)?', line)
if m:
(hostname, key, cruft) = m.groups()
for key, hostnames in hostnames_per_key.items():
if len(hostnames) > 1: