Paul Eggert <[EMAIL PROTECTED]> wrote:
> Jim Meyering <[EMAIL PROTECTED]> writes:
>> If you don't mind truncating first, how about this?
>>
>> true > /var/spool/whatever/foo
>> dd bs=1 seek=2G of=/var/spool/whatever/foo < /dev/null
>
> Also, the latter command works even if the former command is omitted.
> That is, by itself, that invocation of dd resizes
> /var/spool/whatever/foo to 2 GiB, discarding or extending the file as
> needed, which is what the original request asked for.
Hi Paul,
That depends on your definition of "works".
If you don't mind retaining the first 2GiB of content in
a preexisting output file, then it works fine. But the initial
truncation is required if you want to be sure it's a big sparse
file with nothing but NUL bytes.
Try this:
echo foo > k
dd bs=1 seek=2G of=k < /dev/null
head -c4 k
and note that it prints "foo\n".
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