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#!/usr/bin/python3
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# Find duplicate keys in ~/.ssh/known_hosts
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#
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# Of course, we should have been more careful in the first place :)
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from __future__ import division, print_function
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from collections import defaultdict
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import os.path
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import re
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hostnames_per_key = defaultdict(list)
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with open(os.path.expanduser('~/.ssh/known_hosts')) as f:
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for line in f:
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m = re.match('(\S+)\s+(\S+\s+\S+)(.*)?', line)
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if m:
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(hostname, key, cruft) = m.groups()
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hostnames_per_key[key].append(hostname)
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for key, hostnames in hostnames_per_key.items():
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if len(hostnames) > 1:
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print(hostnames)
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