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/gist:7825671

Created December 6, 2013 14:31
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gistfile1.txt
868 clarkema@odin:~ > cat foo
weather.bbc.co.uk
bbc.co.uk
news.bbc.co.uk
869 clarkema@odin:~ > cat foo | perl -waln -F'\.' -e 'print join ".", reverse @F' | sort
uk.co.bbc
uk.co.bbc.news
uk.co.bbc.weather
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