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From: Ian Jackson <[EMAIL PROTECTED]>
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Date: Sat, 24 May 2003 18:23:11 +0100
To: [EMAIL PROTECTED]
Subject: new dd verbosity can be harmful
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Package: coreutils
Version: 5.0-1
-anarres:~> dd if=/dev/null of=/dev/null >/dev/null
0+0 records in
0+0 records out
0 bytes transferred in 0.000937 seconds (0 bytes/sec)
-anarres:~>
Previously, every program (eg script) which used dd as a subprocess
would have to parse dd's stderr. This was a terrible pain, but at
least it was standard and universal.
With dd's new behaviour, all of these programs are now broken. At
best they will emit the new message from dd without further processing
(which may be misleading or downright wrong, depending on the
program). At worst they'll fail because dd has produced an error
message.
It's also not standards-compliant. SuSv3 specifies the output from dd
at
http://www.opengroup.org/onlinepubs/007904975/utilities/dd.html
It does say that `diagnostic messages may also be written to standard
error' but this is not a diagnostic message (ie, an error message).
Instead of inventing extra verbosity by default, dd should
1. grow a new option (verbosity=full perhaps) to turn this on
2. grow a new option (verbosity=none) to turn off even the
current block counts so that programs which are trying to
call dd but not splurge wibble to their stderr can do so
easily.
Ian.
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Date: Wed, 21 Dec 2005 12:52:37 -0500
From: Michael Stone <[EMAIL PROTECTED]>
Subject: Re: new dd verbosity can be harmful
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