🚀 go-pugleaf

>Its SOP for shells that when a control statement has I/O redirected
>the control statement is run in a sub-shell, and so can't affect anything
>in the environment of the real shell (including $# etc).

This is not true, in general (last week I wrote a program to test it).

Redirecting stdin or stdout to files doesn't result in use of a sub-shell; the
subshell is only used when stdin or stdout is connected to another process
(i.e. the control statement is in a pipeline).  And note that ksh88 doesn't
use a sub-shell when only stdin is connected to a process, but *does* use a
sub-shell when stdout is connected to a process; ksh86 and bash use a
sub-shell in either case.

Scott Weikart			Community Data Processing (CdP): 415-322-9069
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