[PATCH]: uniq: add "--group" option (original) (raw)

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From: Assaf Gordon
Subject: [PATCH]: uniq: add "--group" option
Date: Wed, 20 Feb 2013 13:44:07 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.4) Gecko/20120510 Icedove/10.0.4

Hello,

Attached is a suggestion for "--group" option in uniq, as discussed here: http://lists.gnu.org/archive/html/coreutils/2011-03/msg00000.html http://lists.gnu.org/archive/html/coreutils/2012-03/msg00052.html

The patch adds two parameters: --group=[method] separate each unique line (whether duplicated or not) with a marker. method={none,separate(default),prepend,append,both) --group-separator=SEP with --group, separates group using SEP (default: empty line)

And it behaves "as expected":

$ printf "a\na\na\nb\nc\nc\n" | ./src/uniq --group-sep="--" --group=separate a

b

c

$ printf "a\na\na\nb\nc\nc\n" | ./src/uniq --group-sep="--" --group=both

a

b

c

$ printf "a\na\na\nb\nc\nc\n" | ./src/uniq --group-sep="--" --group=prepend

a

b

c

$ printf "a\na\na\nb\nc\nc\n" | ./src/uniq -D --group-sep="--" --group=both

a a a

c c

===

The added tests check all sorts of combinations.

If this is the right direction, I'll send an updated patch (with NEWS/docs/etc.).

-gordon

Attachment: 0001-uniq-add-group-option.patch
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