Re: Useful use of dd [was: Useless use of "dd"]
On Fri, Jul 02, 2021 at 09:49:23AM +0200, tomas@tuxteam.de wrote:
> sudo dd of=/etc/hosts oflags=append
This appears to be a typo for "oflag=append", which is a GNU extension,
not part of the standard POSIX dd. No wonder I didn't know about it. ;-)
The bullseye version of GNU coreutils dd also gives a warning message
with this particular flag:
unicorn:~$ echo g | dd of=foo oflag=append
dd: you probably want conv=notrunc with oflag=append
0+1 records in
0+1 records out
2 bytes copied, 9.141e-05 s, 21.9 kB/s
Not sure if that's unique to bullseye. But anyway, yes, the warning
is accurate; without conv=notrunc, my test file "foo" got overwritten
with just the "g".
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