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perl -i~ -pe ' s/(.*) ([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}) +$/$2 $1/;' 2001-01-02.log
234.234.234.234.asd.f2.35.346t.sdfg.aws.5332.6t.sdf.as4.23.4234 12.12. +153.43