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Re: don't say uniq -D -c is meaningless

From: Pádraig Brady
Subject: Re: don't say uniq -D -c is meaningless
Date: Mon, 26 Jun 2006 10:29:44 +0100
User-agent: Mozilla Thunderbird 1.0.8 (X11/20060502)

Dan Jacobson wrote:
> $ dmesg|sort|uniq -D -c
> uniq: printing all duplicated lines and repeat counts is meaningless
> Try `uniq --help' for more information.
> Meaningless for you, but just what I want:
> $ dmesg|sort|uniq -D|uniq -c
>       5 EXT3-fs: mounted filesystem with ordered data mode.
>       2 PCI: Hardcoded IRQ 14 for device 0000:00:11.1
> So better say
> uniq: please use uniq -D|uniq -c for now until we figure this one out

The restriction is valid.
You want `uniq -dc`

IMHO more restrictions should be added.

Adding -u to -d or -D just suppresses the last item of each group.
These options are meaningless anyway:
uniq -ud ≡ uniq's default mode of operation
uniq -uD ≡ cat


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