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FindList

FindList["file","text"] gives a list of lines in the file that contain the specified string. 

FindList["file",{"text1","text2",…}] gives a list of all lines that contain any of the specified strings. 

FindList[{"file1",…},…] gives a list of lines containing the specified strings in any of the filei. 

FindList[files,text,n] includes only the first n lines found.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.