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Pattern B: B=AK2in your input content. Update your questionAK2in theexample_text.file. I don't want to print all the lines from pattern B to A. As you can see I separated them in my desired output. I want a command that finds first pattern A and then move to previous lines until the first match of pattern be is found. In theexample_file.txtthe first match of pattern A is in line number 12. So from that point it moves up until first occurrence of pattern B is matched which is in line number 7. The same goes to the 2nd pattern A matched where pattern B is in line number 15.AK2*777*6666666, line number 7:AK2*777*7777777, line number 13:AK2*777*6666666, and line number 15:AK2*777*7777777. Sorry, I think you have literally seeB=AK2as the whole pattern. It's onlyAK2is the pattern. I just put it in a variable B for representation of consistent pattern I want to find. Anyways, I'm just gonna correct this section to prevent confusion. Thankstac ../infile | sed -ne '/^AK5\*R/,/AK2\*/p' | tac. What it could not do is redirect each range to a separate file.