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Need to understand this awk statement

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http://stackoverflow.com – I was reading this question Awk code to select multiple patterns The user has this as input ------------------------------------------------------------------------ r4544 | n479826 | 2012-08-28 07:12:33 -0400 (Tue, 28 Aug 2012) | 1 line Changed paths: M /branches/8.6.0/conf/src/main/config/RTSConfig.xml CET-402: some text comment ------------------------------------------------------------------------ r4550 | n479826 | 2012-09-04 05:51:29 -0400 (Tue, 04 Sep 2012) | 1 line Changed paths: M /branches/8.6.0/conf/src/main/config/RTSConfig.xml M /branches/8.6.0/conf/src/main/config/base (HowTos)