Show (or keep) subsets of a file
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I have a file that contains many many blocks of text. Each block starts with a line containing <start string> and ends with a line containing <end string>. I’m only interested in those blocks that have <target string> somewhere in the block; there are far fewer occurrences of <target string> than <start string> but still too many to process manually. What I’d like to be able to do is find each occurrence of <target string>and keep only those lines from the preceding <start string> to the next <end string>. I don’t really care whether everything else is hidden or deleted. Is there a way to do something like this? Thanks for any suggestions.
