Re: bug: @^ pattern substitution

[Aharon Robbins]

Hi. Change your program to:

        $awk '{print $0; sub(/@\^/,"^",$0); print $0}' <<END

and it ought to work as you expect.

Arnold

> From: "Wittstruck, Clinton" <address@hidden>
> To: "'address@hidden'" <address@hidden>
> Cc: "'address@hidden'" <address@hidden>
> Subject: bug: @^ pattern substitution
> Date: Mon, 11 Jun 2001 15:08:31 -0700
>
> I have encounter a bug (or at least inconsistencies) with pattern
> substitution in awk,
> on different platforms. While some function as desired, others either crash
> or do not
> function as desired. The following script demonstrates the problem:
>
> if [ "`uname`" = "SunOS" ] ; then
> awk=nawk
> else
> awk=awk
> fi
>
> # in awk, substitute the first occurrence in $0 of @^ with just ^
>
> $awk '{print $0; sub("@\^","^",$0); print $0}' <<END
> remove the first "@" sign when followed by ^ address@hidden
> END
> exit
>
> Trying the above on various platforms...
>
> HP-UX 10.20 and NutCRACKER 4.2a on Windows NT,
> function as desired. The output is:
>
> remove the first "@" sign when followed by ^ address@hidden
> remove the first "@" sign when followed by ^ ##^##
>
> Solaris 2.7 gets a syntax error:
>
> nawk: syntax error in regular expression @^ at 
>  source line number 1
>  context is
>         {print $0; >>>  sub("@\^","^",$0) <<< 
>
>
> Linux 7.0 and Cygwin 5.0 on Windows NT, do not function as expected.
> The output is:
>
> remove the first "@" sign when followed by ^ address@hidden
> remove the first "@" sign when followed by ^ address@hidden