Date: Sat, 22 Sep 2001 01:10:22 -0500 From: Matt Finlay <matt@ipperformance.com> To: Mario Sergio Fujikawa Ferreira <lioux@uol.com.br> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: bug in shell `` expansion code? Message-ID: <3BAC2B4E.47E32A07@ipperformance.com> References: <20010922011302.A44620@exxodus.fedaykin.here>
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Mario Sergio Fujikawa Ferreira wrote:
> Hi,
>
> While working on a make .mk code, I and Chris Wasser (TDF
> on IRC) came across an interesting behavior:
>
> sh -c 'TDF="echo a && echo b";for i in `${TDF}`; do echo "i:$i"; done'
>
i do not believe this is a bug... it is the way the bash shell executes
commands. this is what is happening:
first TDF gets set to "echo a && echo b",
when you get to the for statement... `${TDF}` causes "echo a && echo
b"(TDF) to be executed.
however instead of executing the way you are intending it actually
executes echo "a && echo b"... this value get stored
back into TDF. so that is why you are getting the output
i:a
i:&&
i:echo
i:b
>
> This should return:
>
> i:a
> i:b
>
> instead, it returns:
>
> i:a
> i:&&
> i:echo
> i:b
>
> If this is not a bug, how do we get it working?
>
> Regards,
>
> --
> Mario S F Ferreira - UnB - Brazil - "I guess this is a signature."
> lioux at ( freebsd dot org | linf dot unb dot br )
> flames to beloved devnull@someotherworldbeloworabove.org
> feature, n: a documented bug | bug, n: an undocumented feature
>
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