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how to suppress dd output?

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Top Forums Shell Programming and Scripting how to suppress dd output?
# 1  
Old 03-07-2010
how to suppress dd output?
I have to stop the output of dd from writing to terminal. Here is the command:
Code:
sudo dd if=boot1h of="/dev/r$temp1"

Here is the output:
Code:
2+0 records in
2+0 records out
1024 bytes transferred in 0.000804 secs (1273715 bytes/sec)

I have tried >> log.txt but it doesn't work. Is there another way to stop this output?
# 2  
Old 03-07-2010
Hi.

The output you see goes to standard error, so:

Code:
sudo dd if=boot1h of="/dev/r$temp1" 2> /dev/null

should get rid of it.
# 3  
Old 03-07-2010
Thanks for the replay. I was just reading about suppressing to the null device. This works for me:
Code:
sudo dd if=boot1h of="/dev/r$temp1" >& /dev/null

For future reference, can you explain the difference between the two methods (<& and 2>)?
# 4  
Old 03-07-2010
I believe that
Code:
blah >& outfile

is shorthand for
Code:
blah > outfile 2>&1

(but I think it's a bash thing, and I never use it, or bash, so...)
# 5  
Old 03-08-2010
I/O Redirection
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