GNU bug report logs - #12366
[gnu-prog-discuss] Writing unwritable files

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Package: coreutils;

Reported by: Paolo Bonzini <bonzini <at> gnu.org>

Date: Thu, 6 Sep 2012 12:14:01 UTC

Severity: normal

Done: Jim Meyering <meyering <at> hx.meyering.net>

Bug is archived. No further changes may be made.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Paolo Bonzini <bonzini <at> gnu.org>
Cc: 12366 <at> debbugs.gnu.org, gnu-prog-discuss <at> gnu.org, John Darrington <john <at> darrington.wattle.id.au>
Subject: bug#12366: [gnu-prog-discuss] Writing unwritable files
Date: Thu, 06 Sep 2012 10:00:34 -0700

>> If some other process is writing F
>> while I run 'sed -i F', F is not replaced atomically.

> How not so?

For example:

echo ac >f
sed -i 's/a/b/' f &
sed -i 's/c/d/' f
wait
cat f

If 'sed' were truly atomic, then the output of this would
always be 'bd'.  But it's not.
This bug report was last modified 12 years and 232 days ago.

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