On 3/11/24 12:08 AM, Kerin Millar wrote:
Speaking of which, to do both of these things has some interesting effects ...$ z() { local -g a; unset -v a; a=123; echo "innermost: $a"; }; unset -v a; x; declare -p a innermost: 123 inner: 123 outer: 123 declare -- a $ z() { local -g a; unset -v a; unset -v a; a=123; echo "innermost: $a"; }; unset -v a; x; declare -p a innermost: 123 inner: 123 outer: 123 declare -- a="123"
These show the normal effects of unset combined with dynamic scoping. This ability to unset local variables in previous function scopes has been the subject of, um, spirited discussion.
$ x() { local a; y; local +g a; a=456; echo "outer: $a"; }; unset -v a; x;
declare -p a
innermost: 123
inner: 123
outer: 456
declare -- a="123"
Let's assume the previous function definitions remain in effect here. In
that case, z continues to unset the local variable definitions in previous
scopes, but the `local +g a' is basically a no-op -- it implies not using
the global scope for a, which is the same as not using the option at all.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
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