GNU bug report logs - #23268
sort ant uniq bug report

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: 126 <cool_navy <at> 126.com>
To: bug-coreutils <at> gnu.org
Subject: sort ant uniq bug report 
Date: Mon, 11 Apr 2016 18:49:44 +0800

[Message part 1 (text/plain, inline)]

hello, Gentleman
when I use sort and uniq, and input like this below, I got wrong output:

$ echo "src/scenelayer/actSceneTipLayer.lua
> src/table/checkpoint/checkPointInfo5000.lua
> src/table/checkpoint/checkPointInfo5000.lua 
> src/table/fightscenecheckpoint.lua
> src/scenelayer/actSceneTipLayer.lua
> src/table/checkpoint/checkPointInfo5000.lua
> src/table/checkpoint/checkPointInfo5000.lua 
> src/table/fightscenecheckpoint.lua
> "|sort -u

src/scenelayer/actSceneTipLayer.lua
src/table/checkpoint/checkPointInfo5000.lua
src/table/checkpoint/checkPointInfo5000.lua 
src/table/fightscenecheckpoint.lua

no result when I use `uniq -u`
$ echo "src/scenelayer/actSceneTipLayer.lua
src/table/checkpoint/checkPointInfo5000.lua
src/table/checkpoint/checkPointInfo5000.lua 
src/table/fightscenecheckpoint.lua
src/scenelayer/actSceneTipLayer.lua
src/table/checkpoint/checkPointInfo5000.lua
src/table/checkpoint/checkPointInfo5000.lua 
src/table/fightscenecheckpoint.lua
"|sort| uniq -u


It appear the same on CentOS, Cygwin , and Mac OS X
I wonder whether it's my own mistake or the program goes wrong.

[Message part 2 (text/html, inline)]

Message #8 received at 23268 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: 126 <cool_navy <at> 126.com>, 23268 <at> debbugs.gnu.org
Subject: Re: bug#23268: sort ant uniq bug report
Date: Mon, 11 Apr 2016 11:52:18 -0400

tag 23268 notabug
close 23268
thanks

Hello,

On 04/11/2016 06:49 AM, 126 wrote:
> hello, Gentleman
> when I use sort and uniq, and input like this below, I got wrong output:
[...]
>> "|sort -u
[...]
> no result when I use `uniq -u`

This is due to wrong usage of 'uniq -u'.

The meaning of '-u' in 'uniq' is subtly different than '-u' in 'sort':

In 'sort', it means "print each line once" i.e. removing duplicates.
In 'uniq', it means "print only unique lines" i.e. lines which appear only once.

The equivalent of 'sort -u' is 'sort|uniq'.

Since all lines in your input had duplicates, 'uniq -u' printed none.

The following will demonstrate:

    $ printf "a\nb\na\nc\nb\n"
    a
    b
    a
    c
    b

    $ printf "a\nb\na\nc\nb\n" | sort -u
     a
    b
    c

    $ printf "a\nb\na\nc\nb\n" | sort | uniq
    a
    b
    c

    $ printf "a\nb\na\nc\nb\n" | sort | uniq -u
    c


As such I'm closing this bug, but discussion can continue by replying to this thread.
regards,
 - assaf

Message #11 received at 23268 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: 126 <cool_navy <at> 126.com>
Cc: 23268 <at> debbugs.gnu.org
Subject: Re: bug#23268: sort ant uniq bug report
Date: Mon, 11 Apr 2016 13:56:40 -0400

(adding debbugs mailing list)

Hello,

On 04/11/2016 12:43 PM, 126 wrote:
> Thank you for your reply.
> I'm sorry for not describe my problem clearly.
> Every other input is working well,but when my input contain several lines of "src/table/checkpoint/checkPointInfo5000.lua". The result of (sort -u) contain two lines of "src/table/checkpoint/checkPointInfo5000.lua"

Without seeing the exact input, it is hard to diagnose the issue.

Please attach a *small* input file, with the exact command that reproduces your situation to help us understand what's going on.
(I highly recommend attaching a file and not copy-pasting to avoid any issues caused by the mail program).

regards,
 - assaf

Message #14 received at 23268 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: 23268 <at> debbugs.gnu.org
Subject: Re: bug#23268: sort ant uniq bug report
Date: Sat, 27 Oct 2018 16:13:15 -0600

tags 23268 notabug
close 23268

(triaging old bugs)

On 2016-04-11 11:56 a.m., Assaf Gordon wrote:
> 
> On 04/11/2016 12:43 PM, 126 wrote:
>> Every other input is working well,but when my input contain several 
>> lines of "src/table/checkpoint/checkPointInfo5000.lua". The result of 
>> (sort -u) contain two lines of 
>> "src/table/checkpoint/checkPointInfo5000.lua"
> 
> Without seeing the exact input, it is hard to diagnose the issue.
> 
> Please attach a *small* input file, with the exact command that 
> reproduces your situation to help us understand what's going on.

With no further follow-ups in 2 years, I'm closing this bug.

-assaf

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