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Full Discussion: sum(col) finding from a file
Top Forums Shell Programming and Scripting sum(col) finding from a file Post 302188333 by era on Wednesday 23rd of April 2008 07:08:42 AM
Old 04-23-2008
You forgot the "set --" which needs to go before the backticks. It causes the positional parameters to be filled with the output from the command in the backticks. (So $1 is whatever awk echos in the first field, and $2 is the second field in the output, etc.)

Code:
 vnix$ awk -F '|' '{ area += $2; population += $3; }
> END { print "area: " area; print "population: " population }' <<HERE
> USSR|10|20|Asia
> Canada|20|30|North America
> China|30|40|Asia
> HERE
area: 60
population: 90
vnix$ 
vnix$ 
vnix$ set -- `awk -F '|' '{ area+=$2; total+=$3; }
END { print "area: " area; print "total: " total }' <<HERE
> USSR|10|20|Asia
> Canada|20|30|North America
> China|30|40|Asia
> HERE
> ` # <- note closing backtick here
vnix$ echo $1
area:
vnix$ echo $2
60
vnix$ echo $4
90

You need to use either one or the other, not mix the two variants I posted.
Last edited by era; 04-23-2008 at 08:15 AM.. Reason: Example output
 

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LEARN ABOUT OPENSOLARIS

sum

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 5.11							    8 Nov 1995								   sum(1B)
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