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Shell Programming and Scripting

how can we perform calculation on the ouput of the commnad

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Top Forums Shell Programming and Scripting how can we perform calculation on the ouput of the commnad
# 1  
Old 08-04-2008
how can we perform calculation on the ouput of the commnad
Hello

I am very new to unix scripting.

The below is the ouput of my one command, now i want to use the two below values 611 and 572 from the output of the command . in the ouput i want 39 which would be come by subtracting 572 to 611.

please suggest how can we perform subtraction of these values.

572 STARTED Thu Jul 31 07:35:09 2008
Starting Job ABC. (...)
611 STARTED Thu Jul 31 07:36:27 2008
Finished Job ABC.

Status code = 0


Thanks & Regards

Deepak
# 2  
Old 08-04-2008
Code:
awk '/STARTED/ && prev="" { prev=$1; next } /STARTED/ { print $1-prev }' inputfile

# 3  
Old 08-04-2008
i am not providing any file, i wanted to provide the comman output only in the single command
# 4  
Old 08-04-2008
Well, just remove the "inputfile" parameter and pipe the output of your command into the awk script.
# 5  
Old 08-04-2008
Small fix
awk ' /STARTED/ && prev=="" { prev=$1; next } /STARTED/ { print $1-prev} '
# 6  
Old 08-04-2008
You can always use pipe ( | ) to work on output of command and there can be numerous commands. Smilie

Code:
command1 | command2 | command3

- nilesh
# 7  
Old 08-04-2008
Thanks for the correction gbielanski.
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