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Top Forums Shell Programming and Scripting Breaking the sum of a column when specific pattern is found Post 302809561 by Priya Amaresh on Monday 20th of May 2013 07:02:11 AM
Old 05-20-2013
Breaking the sum of a column when specific pattern is found

Hi

Am trying to sum up a file
Code:
# cat /Out
maths                   2            0.0          
english                2091            0.2          
history               -1            0.0           
physics                18            0.0
--------------------------------------
maths                   2            0.0          
english                2091            0.2          
history               -1            0.0           
physics                18            0.0
-------------------------------------
maths                   2            0.0          
english                2091            0.2          
history               -1            0.0           
physics                18            0.0

Am trying to sum up only the second column of the file
I need to sum up like, When "-------------" is met the values that had sum up so far should be stored in another variable and then a new sum from zero has to be proceeded until again "-------------------" is met and store the value in another new variable

I reached till
Code:
we=`awk '{print $2}'  /Out |grep '[0-9]'|awk '{sum+=$1} END {print sum}'`

But this gives the sum of entire column..
Please help..
 

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sum(1)								   User Commands							    sum(1)

NAME
sum - print checksum and block count for a file SYNOPSIS
sum [-r] [file]... DESCRIPTION
The sum utility calculates and prints a 16-bit checksum for the named file and the number of 512-byte blocks in the file. It is typically used to look for bad spots, or to validate a file communicated over some transmission line. OPTIONS
The following options are supported: -r Use an alternate (machine-dependent) algorithm in computing the checksum. OPERANDS
The following operands are supported: file A path name of a file. If no files are named, the standard input is used. USAGE
See largefile(5) for the description of the behavior of sum when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes). ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of sum: LC_CTYPE, LC_MESSAGES, and NLSPATH. EXIT STATUS
The following exit values are returned. 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------------------------------------+ | ATTRIBUTE TYPE ATTRIBUTE VALUE | |Availability SUNWesu | |CSI Enabled | +-----------------------------------------------------------+ SEE ALSO
cksum(1), sum(1B), wc(1), attributes(5), environ(5), largefile(5) DIAGNOSTICS
Read error is indistinguishable from end of file on most devices. Check the block count. NOTES
Portable applications should use cksum(1). sum and usr/ucb/sum (see sum(1B)) return different checksums. SunOS 5.11 7 Nov 1995 sum(1)
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