I see that:
exec {n}<>&-
is syntactically invalid in ksh and zsh. However "n" is a file
descriptor for open terminal, in ksh you can do this:
exec {n}<&-
exec {n}>&-
and not get an error while in zsh, you do get an error because zsh
says n is already closed. (Probably more relevant is the fact that n
is open read/write than it is a terminal.)
The zsh folks seem to think that giving an error on the second close
is the right thing to do.
So
1. Does the first close close *both* input and output
2. If 1 is true, should one get an error message on the second close?
The zsh thinking and discussion starts here:
http://www.zsh.org/mla/workers/2008/msg01791.html
Thanks.
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