On Mon, 16 Apr 2012 14:29:41 +0200 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?= wrote:
> Glenn, using export _AST_FEATURES=value to change getconf UNIVERSE
> only works per process, but does not affect built ins. I made 2
> examples to demonstrate this:
> The example should print "bsd" and "att" but it does not work because
> _AST_FEATURES is only probed at process start up:
> ksh -c 'builtin getconf ; _AST_FEATURES="UNIVERSE = bsd" getconf
> UNIVERSE ; _AST_FEATURES="UNIVERSE = att" getconf UNIVERSE'
> att
> att
> > it is preferable to change the writeable values via getconf(1)
that statement probably wasn't strong enough
I've added this to getconf --man ENVIRONMENT:
_AST_FEATURES is an implementation detail of process inheritance;
it may change or vanish in the future; don't rely on it.
this works:
$ ksh -c '
for u in att bsd
do getconf UNIVERSE = $u
print -n $(getconf UNIVERSE)" "
sum <<<"hello sum"
done'
att 915 1
bsd 47476 1
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