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Remove a block of lines between two patterns

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linux-howto

http://unix.stackexchange.com – In a bash script using sed how can I remove a block of lines beginning with -pattern a- and ending with -pattern b- where the the contents contains -pattern c- ( or does NOT contain -pattern c-)? So : line 1 -pattern a- line 2 line 3 -pattern b- line 4 -pattern a- line 5 -pattern c- line 6 -pattern b- In this example I want to remove lines 4,5 and 6 (or remove 1,2 and 3 for not containing -pattern c-). (HowTos)