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Re: SH bahaviour to not fork a subshell after " | while read "


From: Chet Ramey
Subject: Re: SH bahaviour to not fork a subshell after " | while read "
Date: Fri, 01 Jun 2012 08:18:40 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

On 6/1/12 4:53 AM, freD wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: powerpc
> OS: aix5.1
> Compiler: xlc
> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='powerpc'
> -DCONF_OSTYPE='aix5.1' -DCONF_MACHTYPE='powerpc-ibm-aix
> 5.1' -DCONF_VENDOR='ibm' -DLOCALEDIR='/opt/freeware/share/locale'
> -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H  -I.  -I. -I
> ./include -I./lib  -I/opt/freeware/include -O2
> uname output: AIX tsm 1 6 00C530EB4C00
> Machine Type: powerpc-ibm-aix5.1
> 
> Bash Version: 3.0
> Patch Level: 16
> Release Status: release
> 
> Description:
> 
> In bash mode, variable are lost after a while loop:
> 
> bash-3.00# T=toto ; du | while read a ; do   T=$a ; done ; echo $T
> toto

Upgrade.  Current versions of bash have a shell option that will allow
you to do this.  And bash-3.0 is seven years old.


> Fix:
> May be starting in "sh" mode and/or posix mode should behave like a
> real bourne shell

That's funny.  `Real' Bourne shells don't do this.  The only reason sh on
your particular system does it is because AIX uses ksh as sh.


-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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