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How to store the output of "time dd if= of=" in a variable

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# 8  
Old 03-04-2009
What does the command give manually?

Code:
time dd if=/dev/zero of=/dev/sda1 bs=512 count=2048;sync

# 9  
Old 03-04-2009
It shows the time taken, throuput and the real,user seconds for the time command in the prompt..
# 10  
Old 03-04-2009
Quote:
Originally Posted by amio
I need to store the real seconds of the following command in a variable. How could it be done?
Code:
time=$( { time dd if=/dev/zero of=/dev/sda1 bs=512 count=2048;sync } 2>&1 > /dev/null  )

# 11  
Old 03-05-2009
Hi Johnson,

Output of
Code:
seconds=$( { time dd if=/dev/zero of=/dev/sda1 bs=512 count=2048;sync } 2>&1 > /dev/null  )

results in
seconds: 2048+0 records in 2048+0 records out 1048576 bytes (1.0 MB) copied, 0.0156077 s, 67.2 MB/s real 0m0.018s user 0m0.001s sys 0m0.014s

seconds variable has the output of both the dd and time commands.
I need just the real seconds (0m0.018s) of time command alone to be stored in the variable seconds..
Thanks,
Amio
# 12  
Old 03-05-2009
Code:
temp=$(
 { time dd if=/dev/zero of=/dev/null bs=512 count=2048 2>/dev/null;sync
 } 2>&1 > /dev/null  )
temp=${temp#*real?}
seconds=${temp%?user*}

# 13  
Old 03-05-2009
Hi Johnson,

Code:
temp=$(
 { TIMEFORMAT=%S;time dd if=/dev/zero of=/dev/null bs=512 count=2048 2>/dev/null;sync
 } 2>&1 > /dev/null  )

gave me the right output.
Thanks a lot. :-)
Amio
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