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I think that sed can be used to do this, but I'm not sure how. I'd like sed to run through a file looking for two patterns, 'a' and 'b'. When it encounters a line that matches 'b' I want to show the last line that matched 'a'. How can this be done?

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Looks like this works:

sed -n '/a/{h};/b/{g;p}' file.txt
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    Or, with standard sed: sed -n '/a/h;/b/{g;p;}'
    – Kusalananda
    Oct 5 '18 at 22:37

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