CVS commit: src/bin/sh

["Robert Elz" <kre%netbsd.org@localhost>]

Module Name:    src
Committed By:   kre
Date:           Thu May 12 13:15:43 UTC 2016

Modified Files:
        src/bin/sh: sh.1

Log Message:
Document that a N>&N (or N<&N) redirection turns off close-on-exec for N
(where N is a decimal fd number) either when used as
        some-command N>&N
(where fd N is passed, open, to some-command - which is obviously what is
wanted)

Or as
        exec N>&N
which effects fd N for all future commands.

Note that this means
        exec N>foo N>&N
returns to the old behaviour of leaving the file descriptor open
when commands are run (as do most shells, other than ksh) and works for
both new and old NetBSD shells (old ones never set close-on-exec, and treat
N>&N as a rather meaingless no-op request, and just ignore it), new ones
set close-on-exec on the first redirection, then disable it again on the
second.

Everything here about >& for output fds applies to <& for input ones.

OK christos@


To generate a diff of this commit:
cvs rdiff -u -r1.122 -r1.123 src/bin/sh/sh.1

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.