Date: Mon, 20 Jul 1998 15:35:39 +1000 (EST) From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/7325: /bin/sh redirection does not match man page Message-ID: <199807200537.PAA16828@gsms01.alcatel.com.au>
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>Number: 7325
>Category: bin
>Synopsis: /bin/sh redirection does not match man page
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Jul 19 22:40:01 PDT 1998
>Last-Modified:
>Originator: Peter Jeremy
>Organization:
>Release: FreeBSD 2.2.6-RELEASE i386
>Environment:
FreeBSD 2.2.6
>Description:
sh.1 states:
Redirection operators:
< > >| << >> <& >& <<- <>
...
[n]<> file open file for reading and writing on stdin (or n)
But any attempt to use the '<>' operator results in the error
"Syntax error: redirection unexpected".
Looking at the code in 2.2.6-RELEASE, there is no evidence that this
function was ever implemented. As well as the error message during
parsing, none of the open(2) calls mention O_RDWR.
This makes it impossible to do shell redirection for programs that
want to read/write from the same FD. One such program is ppp(8).
>How-To-Repeat:
/bin/sh -c 'echo <> foo'
>Fix:
Changing the documentation would be easy. Making the code match the
documentation would be more challenging.
>Audit-Trail:
>Unformatted:
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