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Re: discrepancy with variable assignments and simple commands between sh


From: Chet Ramey
Subject: Re: discrepancy with variable assignments and simple commands between sh and bash
Date: Wed, 25 Aug 2010 09:36:30 -0400
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On 8/25/10 1:39 AM, Jan Schampera wrote:

> Okay, I think I found something
> 
> [POSIX excerpts]
> - When a function is executed, it shall have the syntax-error and
> variable-assignment properties described for special built-in utilities in
> the enumerated list at the beginning of Special Built-In Utilities .
> - Variable assignments specified with special built-in utilities remain in
> effect after the built-in completes; this shall not be the case with a
> regular built-in or other utility.
> 
> [Bash docs about POSIX mode]
>  24. Assignment statements preceding shell function calls persist in the
>      shell environment after the function returns, as if a POSIX
>      special builtin command had been executed.
> 
> Conclusion (still waiting for the Austin Group undercover guy):
> - POSIX specifies this behaviour
> - Bash in Bash-mode overrides this (which results in intuitive behaviour,
> IMHO)
> - Bash in POSIX-mode respects it

Your conclusions are correct.

-- 
``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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