On Tue, 23 Feb 2010, t...@icada.com wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc -I/usr/src/packages/BUILD/bash-3.1
> -L/usr/src/packages/BUILD/bash-3.1/../readline-5.1
> Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu'
> -DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
> -DHAVE_CONFIG_H -I. -I. -I./include -I./lib -O2 -fmessage-length=0 -Wall
> -D_FORTIFY_SOURCE=2 -g -D_GNU_SOURCE -DRECYCLES_PIDS -Wall -pipe -g -fPIE
> -fbranch-probabilities
> uname output: Linux t60 2.6.18.8-0.13-default #1 SMP Thu Nov 6 13:35:13 UTC
> 2008 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: x86_64-suse-linux-gnu
>
> Bash Version: 3.1
> Patch Level: 17
> Release Status: release
>
> Description:
> I would have expected the output to be 2 in both cases. My mistake or
> yours? :-)
>
> Repeat-By:
> a=1; echo foo;{ a=2; }; echo $a # output: 2
> a=1; echo foo|{ a=2; }; echo $a # output: 1
>
> Bug or feature?
Standard behaviour; all components of a pipeline are executed in a
subshell.
--
Chris F.A. Johnson <http://cfajohnson.com>
===================================================================
Author:
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
