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| author | joerg <joerg@FreeBSD.org> | 1997-10-11 20:09:05 +0000 |
|---|---|---|
| committer | joerg <joerg@FreeBSD.org> | 1997-10-11 20:09:05 +0000 |
| commit | 4841b45bbe197e54bb7732317930e8591d51362c (patch) | |
| tree | 2bbaeb532cca6a0c260f5fc674f9d1d0ce9b10cb /bin/dd/dd.1 | |
| parent | 11466e2a6f0898af142d8fbff4ead6b7078c6e04 (diff) | |
| download | FreeBSD-src-4841b45bbe197e54bb7732317930e8591d51362c.zip FreeBSD-src-4841b45bbe197e54bb7732317930e8591d51362c.tar.gz | |
Teach dd(1) about an option to write sparse files. Can be useful for
things like diskless clients' swap files etc.
Submitted by: pascal@zuo.dec.com (Pascal Pederiva) (ages ago, with many
stylistic changes by me)
Diffstat (limited to 'bin/dd/dd.1')
| -rw-r--r-- | bin/dd/dd.1 | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/bin/dd/dd.1 b/bin/dd/dd.1 index 157e52e..85aca7b 100644 --- a/bin/dd/dd.1 +++ b/bin/dd/dd.1 @@ -33,7 +33,7 @@ .\" SUCH DAMAGE. .\" .\" @(#)dd.1 8.2 (Berkeley) 1/13/94 -.\" $Id: dd.1,v 1.4 1997/02/22 14:02:43 peter Exp $ +.\" $Id: dd.1,v 1.5 1997/04/28 04:07:29 steve Exp $ .\" .Dd January 13, 1994 .Dt DD 1 @@ -250,6 +250,13 @@ regularly sized blocks to be written. This option is incompatible with use of the .Cm bs= Ns Ar n block size specification. +.It Cm sparse +If one or more output blocks would consist solely of +.Tn NUL +bytes, try to seek the output file by the required space instead of +filling them with +.Tn NULs , +resulting in a sparse file. .It Cm swab Swap every pair of input bytes. If an input buffer has an odd number of bytes, the last byte will be |
