anyone can help me with dd script please?


 
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# 1  
Old 06-24-2008
anyone can help me with dd script please?

Hi

Can anyone please help with the following script I need - .ksh preferably?

I have external disks attached to a system that I have to label and then run the dd command on all external disk found.

I have kicked off the dd command as follows manually to see what its output is like first and what it throws back:

dd if=/dev/zero of=/dev/dsk/c0t0d0s2 bs=8192

and this doesn't seem to give an exit status or come back to the unix prompt? Should I kick these off as an external task (the ampersand - &)

But anyway...I need to kick off this dd command on all external hard disks found and then go into some kind of checking loop so I can check when these dd commands have finished and then carry on with the rest of my test.

As the dd command doesnt seem to give an exit status, I was thinking that I could run a ps -ef command:

ps -ef | awk '/dd/ && !/awk/ {print $2}'

and log the process id(s) for the dd commands and then when the dd commands have completed there will be NO process id.

How can I do this please within a loop?

thanks

angus
# 2  
Old 06-24-2008
Not sure if this is called "to label" but you write zeroes on these disks with 8k block size.
No idea what Unix/Linux you are using but use the command to get a list of the wanted disks with some command, parse it so it is a list and work it with "for - do - done" and have it doing it's dd.
You can always check exit codes with "$?". So test it if it's not zero which usually means it didn't go smooth.
# 3  
Old 06-24-2008
thanks.....there is no exit status from this command unfortunately with this storage version at least.
I have to kick off the 'dd' command and run it in the background Ive found to a temp file.
# 4  
Old 06-24-2008
The exit command of "dd" can be printed with for example
Code:
echo $?

after you ran it. Has nothing to do with storage versions. Programs usually give exit codes.
 
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