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Top Forums UNIX for Dummies Questions & Answers Sum every 3 consecutive numbers in a column Post 302871501 by RudiC on Wednesday 6th of November 2013 10:07:56 AM
Old 11-06-2013
You'll have to adapt it thoroughly, as the boundary conditions have changed!
Code:
awk     'NR==1          {N=4}
         NR>=N          {printf "%s\n",sum; N+=3; sum=0}
                        {sum+=$1}
         END            {printf "%s\n", sum}
        ' file
41.1
165
22

But, although this works, it can be improved/simplified . Your turn again...
This User Gave Thanks to RudiC For This Post:
 

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sum(1B) 					     SunOS/BSD Compatibility Package Commands						   sum(1B)

NAME
sum - calculate a checksum for a file SYNOPSIS
/usr/ucb/sum file... DESCRIPTION
sum calculates and displays a 16-bit checksum for the named file and displays the size of the file in kilobytes. It is typically used to look for bad spots, or to validate a file communicated over some transmission line. The checksum is calculated by an algorithm which may yield different results on machines with 16-bit ints and machines with 32-bit ints, so it cannot always be used to validate that a file has been transferred between machines with different-sized ints. 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). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
sum(1), wc(1), attributes(5), largefile(5) DIAGNOSTICS
Read error is indistinguishable from EOF on most devices; check the block count. NOTES
sum and /usr/bin/sum (see sum(1)) return different checksums. This utility is obsolete. SunOS 5.10 8 Nov 1995 sum(1B)
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