CODEWITHSUNDEEP
linuxstringunixgrep
Ragav
Ragav

Reputation: 962

Grep consecutive lines with duplicates field values.

I can't figure out how to grep the lines I want in this file:

8.txt  07:34:12 -> CONTENT START
8.txt  07:34:42 <-CONTENT END
8.txt  07:35:08 -> CONTENT START
8.txt  07:36:33 <-CONTENT END
8.txt  07:57:51 -> CONTENT START
8.txt  07:57:52 -> CONTENT START
8.txt  07:58:25 <-CONTENT END
8.txt  07:58:36 -> CONTENT START
8.txt  07:59:24 <-CONTENT END
8.txt  08:20:23 -> CONTENT START
8.txt  08:21:22 <-CONTENT END
8.txt  08:22:44 -> CONTENT START
8.txt  07:34:12 -> CONTENT START
8.txt  08:23:07 <-CONTENT END
8.txt  08:26:35 -> CONTENT START
8.txt  08:27:24 <-CONTENT END
8.txt  08:29:53 -> CONTENT START
8.txt  08:30:28 <-CONTENT END
8.txt  08:30:59 -> CONTENT START
8.txt  08:31:21 <-CONTENT END
8.txt  08:48:28 -> CONTENT START
8.txt  08:48:56 <-CONTENT END
8.txt  09:13:10 -> CONTENT START
8.txt  09:13:40 <-CONTENT END
8.txt  09:13:52 -> CONTENT START
8.txt  09:14:44 <-CONTENT END
8.txt  09:19:50 -> CONTENT START
8.txt  09:20:28 <-CONTENT END
8.txt  09:27:04 -> CONTENT START
8.txt  09:27:40 <-CONTENT END

If CONTENT START occurrence on consecutive lines then display them.

Output expected:

8.txt  07:57:51 -> CONTENT START
8.txt  07:57:52 -> CONTENT START
8.txt  08:22:44 -> CONTENT START
8.txt  07:34:12 -> CONTENT START

How can this be done?

Upvotes: 0

Views: 587

Answers (2)

Ed Morton
Ed Morton

Reputation: 203684

You don't say what to do if CONTENT START appears on 3 consecutive lines so this may or may not be what you want:

awk -v s="CONTENT START" '$0~s && p~s{print p ORS $0} {p=$0}' file

Upvotes: 0

Chris Seymour
Chris Seymour

Reputation: 85805

This isn't a task for grep use uniq for this:

$ uniq -D -f4 file
8.txt  07:57:51 -> CONTENT START
8.txt  07:57:52 -> CONTENT START
8.txt  08:22:44 -> CONTENT START
8.txt  07:34:12 -> CONTENT START

The option -D is for displaying the duplicated lines and -f4 skips the first four fields.

Upvotes: 4

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