Joerg Schilling <joerg.schill...@fokus.fraunhofer.de> wrote, on 25 Jul 2017:
>
> unset X
> cat <<-EOF
> ${X=2}
> EOF
> echo "${X-1}"
>
> it turned out that ksh88 and a classical Bourne Shell both print
>
> 2
> 1
>
> but ksh93 and my "bosh" print
>
> 2
> 2
>
> but when I recompile bosh with -DNO_VFORK, it prints
>
> 2
> 1
>
> Could you comment whether this is undefined as well?
Yes it is, as far as I can see. The relevant text in 2.7.4 is:
If no part of word is quoted, all lines of the here-document shall
be expanded for parameter expansion, command substitution, and
arithmetic expansion.
It says nothing about which environment the expansion must be done in.
--
Geoff Clare <g.cl...@opengroup.org>
The Open Group, Apex Plaza, Forbury Road, Reading, RG1 1AX, England
