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From:	Csaba Raduly <rcsaba AT gmail DOT com>
Date:	Tue, 11 Oct 2016 12:56:54 +0200
Message-ID:	<CAEhDDbCrMOUsOfD0FVxfBXUE1TQAqsnmCM4=03dscgSFud35fg@mail.gmail.com>
Subject:	Re: uniq not working
To:	cygwin list <cygwin AT cygwin DOT com>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id u9BAvSSt030214

Hi Felipe,

On Tue, Oct 11, 2016 at 12:43 PM, Felipe Vieira  wrote:
> Dear mailing list,
>
> the uniq program seems to be faulty on my cygwin:
>
> /tmp » cat u.txt
> 1
> 2
> 3
> 4
> 5
> 1
> 2
> 3
> 6
> 7
> 8
>
>
> /tmp » uniq -c u.txt
>       1 1
>       1 2
>       1 3
>       1 4
>       1 5
>       1 1
>       1 2
>       1 3
>       1 6
>       1 7
>       1 8
>       1
> /tmp »
>
> As you can see it does not eliminate duplicate lines.
> This file was created with vim. Same results if created with windows notepad.
> What am I missing?

You are missing an important step: reading the manual.

$ man uniq
UNIQ(1)
                         User Commands
                                                        UNIQ(1)

NAME
       uniq - report or omit repeated lines

SYNOPSIS
       uniq [OPTION]... [INPUT [OUTPUT]]

DESCRIPTION
       Filter adjacent matching lines from INPUT (or standard input),
writing to OUTPUT (or standard output).
               ^^^^^^^^^

uniq collapses identical lines only if they are consecutive.
The typical way to ensure this is to sort the file first.

$ sort c.txt | uniq

Csaba
-- 
GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++
The Tao of math: The numbers you can count are not the real numbers.
Life is complex, with real and imaginary parts.
"Ok, it boots. Which means it must be bug-free and perfect. " -- Linus Torvalds
"People disagree with me. I just ignore them." -- Linus Torvalds

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