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file contents

 abc
 def
 ghi

match across 2 lines
 # cat .abc.txt | sed -n '/abc/N;/def/p'
 abc
 def


match across 3 lines
 # cat .abc.txt | sed -n '/abc/N;/def/N;/ghi/p'
 abc
 def
 ghi

the N; tells sed to read the next line past \n and continue the match

[[category:sed]]

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