Web lists-archives.com

Re: Some help with dd backing up into an iso




tomas@xxxxxxxxxx [2017-03-07 09:35:06+01] wrote:

> dd comes in handy whin you know how much to copy. So this idiom makes
> sense
>
>   dd if=/dev/zero of=lotsofnull bs=1024 count=1024 # copy 1M of zeros

That particular thing can be made faster without transferring any data:

    $ dd obs=1M count=0 seek=1 of=file
    0+0 records in
    0+0 records out
    0 bytes (0 B) copied, 1,1289e-05 s, 0,0 kB/s

    $ ls -lh file
    -rw-r--r-- 1 dtw dtw 1,0M 2017-03-07 10:52:14 file

-- 
/// Teemu Likonen   - .-..   <https://keybase.io/tlikonen> //
// PGP: 4E10 55DC 84E9 DFF6 13D7 8557 719D 69D3 2453 9450 ///

Attachment: signature.asc
Description: PGP signature