New rc shell feature
Based on an original idea and initial code by Erik Quanstrom, Russ Cox has implemented a new feature in the rc shell to allow subscripts that select a sequence (ie., range) of items.
The extended syntax for subscript notation is like this:
; foo = (a b c d) ; echo $foo(2-3) b c echo $foo(2-) b c d
Russ points out in the patch(1) he submitted to sources that this allows to replace the old idiom:
; *=($x); shift; x=($*)
with the much cleaner:
This change was committed a few weeks ago to both the main (native) Plan 9 tree and the Plan 9 from User Space tree.
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