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Re: <> redirection and notations

To: es@hawkwind.utcs.toronto.edu
Subject: Re: <> redirection and notations
From: Chet Ramey <chet@odin.INS.CWRU.Edu>
Date: Thu, 1 Apr 1993 12:58:59 -0500
In-reply-to: Message from arnold@cc.gatech.edu of Thu, 1 Apr 1993 09:36:25 -0500 (id <9304011436.AA01784@penfold.cc.gatech.edu>)
Read-receipt-to: chet@po.CWRU.Edu
Reply-to: chet@po.CWRU.Edu

> I was mistaken when I said that <> truncated files in ksh. (Maybe it does
> in bash?

It doesn't.  The version of bash that Arnold has opens it O_RDWR; I
just changed that yesterday to O_RDWR|O_CREAT.

Some experimentation with `strace' and ksh shows that ksh also opens the
file O_RDWR|O_CREAT.

O_RDWR|O_CREAT is the right thing.  No shell that I know of has ever used
O_TRUNC with <>.

Chet

--
``The ballpark is quiet now, save for the sound of droplets landing.  That
  is as it should be.  For today there are two fewer boys of summer.''

Chet Ramey, Case Western Reserve University	Internet: chet@po.CWRU.Edu

References:
- <> redirection and notations
  - From: arnold@cc.gatech.edu (Arnold Robbins)

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