curly brackets a bashism?

[Simon Richter <sjr@debian.org>]

Hi,

one of my sponsees' packages (gv) doesn't build, as it uses a command of
the form

cp debian/{preinst,postinst,prerm,postrm} ...

This works fine with sh -> bash, but doesn't for sh -> ash.

Which one is correct?

 - {} is a bashism. lintian should detect this, and my sponsee should fix
   his package.

or

 - {} is POSIX. ash should be fixed.

   Simon

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