GNU bug report logs - #24881
make blindingly clear cut -f 2,1 = cut -f 1,2

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: bug#24881: closed (Re: bug#24881: make blindingly clear cut -f
 2,1 = cut -f 1,2)
Date: Sat, 05 Nov 2016 12:20:03 +0000

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Your bug report

#24881: make blindingly clear cut -f 2,1 = cut -f 1,2

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 24881 <at> debbugs.gnu.org.

-- 
24881: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24881
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Pádraig Brady <P <at> draigBrady.com>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>,
 24881-done <at> debbugs.gnu.org
Subject: Re: bug#24881: make blindingly clear cut -f 2,1 = cut -f 1,2
Date: Sat, 5 Nov 2016 12:19:11 +0000

On 05/11/16 11:31, 積丹尼 Dan Jacobson wrote:
> $ info cut
> 
> ‘-f FIELD-LIST’
> ‘--fields=FIELD-LIST’
>      Select for printing only the fields listed in FIELD-LIST.  Fields
>      are separated by a TAB character by default.  Also print any line
>      that contains no delimiter character, unless the ‘--only-delimited’
>      (‘-s’) option is specified.
> 
>      Note ‘awk’ supports more sophisticated field processing, and by
>      default will use (and discard) runs of blank characters to separate
>      fields, and ignore leading and trailing blanks.
>           awk '{print $2}'    # print the second field
>           awk '{print $NF-1}' # print the penultimate field
>           awk '{print $2,$1}' # reorder the first two fields
> 
> 
> Mention here:
>         whereas cut -f 2,1 will just give you the same output as cut -f 1,2
> Thanks.

Pushed at
http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=v8.25-86-g5161eff

thanks,
Pádraig

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From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-coreutils <at> gnu.org
Subject: make blindingly clear cut -f 2,1 = cut -f 1,2
Date: Sat, 05 Nov 2016 19:31:32 +0800

$ info cut

‘-f FIELD-LIST’
‘--fields=FIELD-LIST’
     Select for printing only the fields listed in FIELD-LIST.  Fields
     are separated by a TAB character by default.  Also print any line
     that contains no delimiter character, unless the ‘--only-delimited’
     (‘-s’) option is specified.

     Note ‘awk’ supports more sophisticated field processing, and by
     default will use (and discard) runs of blank characters to separate
     fields, and ignore leading and trailing blanks.
          awk '{print $2}'    # print the second field
          awk '{print $NF-1}' # print the penultimate field
          awk '{print $2,$1}' # reorder the first two fields


Mention here:
        whereas cut -f 2,1 will just give you the same output as cut -f 1,2
Thanks.


     In the unlikely event that ‘awk’ is unavailable, one can use the
     ‘join’ command, to process blank characters as ‘awk’ does above.
          join -a1 -o 1.2     - /dev/null # print the second field
          join -a1 -o 1.2,1.1 - /dev/null # reorder the first two fields

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