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Full Discussion: Question about awk command
Homework and Emergencies Homework & Coursework Questions Question about awk command Post 302939612 by RudiC on Friday 27th of March 2015 03:44:28 AM
Old 03-27-2015
This is progammed utmost meticulously, which is good practice and not a bad thing in the first place. but, using some awk- features, it could be boiled down to

Code:
awk '{sum+=$5} END {print sum}' input_file

Any awk variable is allocated on first reference and defaults to zero/empty, so the BEGIN section is superfluous. The += is the addition assignment known from e.g. C .
 

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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 This utility is obsolete.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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