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Full Discussion: if condition doesn't work
Top Forums Shell Programming and Scripting if condition doesn't work Post 302325056 by vgersh99 on Friday 12th of June 2009 02:41:14 PM
Old 06-12-2009
Quote:
Originally Posted by BubbaJoe
One way would be to use the awk command.
Code:
var=`awk -F" " 'BEGIN{total=0;}{total+=$4;}END{print total}' testfile`

Then
Code:
echo $var
5

You don't need to initialize 'total'. All variable are strings by default and initialized to an empty string (""). Once you start performing arithmetic, an empty string is casted to 0.
 

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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 This utility is obsolete.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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