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10-05-2007, 11:39 AM
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#1
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Member
Registered: Feb 2007
Posts: 197
Rep:
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dd question
Hi,
I have read about DD command, what it means by "dd if=/dev/zero " , any explanation would be appriciated.
Thanks
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10-05-2007, 11:40 AM
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#2
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Member
Registered: Feb 2005
Distribution: Ubuntu, CentOS
Posts: 585
Rep:
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/dev/zero and /dev/null
if means input file
/dev/zero and /dev/null are the same, the bit bucket or null device. If the input file is /dev/zero, it sounds like this command is for zeroing a file or device.
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10-05-2007, 01:27 PM
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#3
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Member
Registered: Oct 2004
Distribution: Slackware
Posts: 376
Rep:
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/dev/null and /dev/zero are not the same.
While both can act as bit buckets, reading from
/dev/null is equivalent to reading an empty file, while reading from /dev/zero results in an infinite stream of null bytes (bytes with value 0).
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10-05-2007, 02:09 PM
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#4
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Member
Registered: Nov 2006
Location: USA, CA
Distribution: RedHat, Debian
Posts: 202
Rep:
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Example:
1. dd if=/dev/null of=x count=1 bs=1024
Doesn't work. Created file 'x' has zero size
2. dd if=/dev/zero of=x count=1 bs=1024
Creates file 'x' of size 1024 filled with binary zeros.
Check out this link:
http://www.linuxquestions.org/questi...ommand-362506/
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10-06-2007, 08:10 AM
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#5
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Member
Registered: Feb 2007
Posts: 197
Original Poster
Rep:
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Hello Guys,
Thank you so much. Does it mean, it crates the file from /dev/zoero and copy it into file x ?
Thanks in advance.
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10-06-2007, 11:11 AM
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#6
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Member
Registered: Feb 2007
Posts: 197
Original Poster
Rep:
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When it creates file called X, what parttion it is using?
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10-07-2007, 01:11 PM
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#7
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Member
Registered: Nov 2006
Location: USA, CA
Distribution: RedHat, Debian
Posts: 202
Rep:
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Quote:
Does it mean, it crates the file from /dev/zoero and copy it into file x
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Not in a sense of copying /dev/zero to you output file. It uses /dev/zero as a pattern to write the output file. If you need any other data then zero you might use "if=/dev/random" for input file.
Quote:
When it creates file called X, what parttion it is using?
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It is created in the partition where the output file directory located. For example if output file is "of=/home/user/mokku/new_file", then it is in the partition of /home/user/mokku.
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10-08-2007, 07:52 AM
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#8
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Member
Registered: Feb 2007
Posts: 197
Original Poster
Rep:
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Thank you so much, I got it now.
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