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Re: Setting $0 to fields after changing FS

From: Ed Morton
Subject: Re: Setting $0 to fields after changing FS
Date: Sat, 20 Nov 2010 17:03:09 -0600
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100915 Thunderbird/3.1.4

 I don't need it, I'd never really do this in my code.



On 11/20/2010 2:35 PM, Aharon Robbins wrote:

Unfortunately, I see this with the current stable gawk too.

Fortunately, the development, byte-code gawk, now available from Git
on Savannah, does not have this problem.  (Yay!)

If you really need a fix for gawk-stable, let me know. Otherwise, since
it's working in the development gawk, I'm happy. I will try to add
your program to the test suite.



Date: Sat, 20 Nov 2010 07:23:44 -0600
From: Ed Morton<address@hidden>
To: address@hidden
Subject: Setting $0 to fields after changing FS

I found this on cygwin on Windows XP. Notice the control characters on the
final line of output.

Reading http://www.gnu.org/manual/gawk/html_node/Bugs.html didn't point me to
the list of known bugs, so I don't know if this is a known problem or not.


      Ed Morton.


$ gawk --version | head -2
GNU Awk 3.1.6
Copyright (C) 1989, 1991-2007 Free Software Foundation.

$ cat -v tst.awk
          FS = "-"
          printf "FS=<%s>  NF=<%d>  $0=<%s>  $1=<%s>  $2=<%s>\n",FS,NF,$0,$1,$2

          FS = ","
          $0 = $1
          printf "FS=<%s>  NF=<%d>  $0=<%s>  $1=<%s>  $2=<%s>\n",FS,NF,$0,$1,$2

          $0 = $2
          printf "FS=<%s>  NF=<%d>  $0=<%s>  $1=<%s>  $2=<%s>\n",FS,NF,$0,$1,$2


$ gawk -f tst.awk | cat -v
FS=<->  NF=<1>  $0=<foo,bar>  $1=<foo,bar>  $2=<>
FS=<,>  NF=<2>  $0=<foo,bar>  $1=<foo>  $2=<bar>
FS=<,>  NF=<1>  $0=<M-TM-^]^T>  $1=<M-TM-^]^T>  $2=<>

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