Sum function

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# 1  
Old 01-16-2014
Sum function

I have file input


I need to sum column 5 till column 19, expected output below


# 2  
Old 01-16-2014
Hi, that seems pretty straight forward.. What have you tried?
# 3  
Old 01-16-2014
i've tried this
cat fileinput | nawk '{FS=","; OFS=","; print $1,$2,$3,$4,sum[$5+$6+$7+$8+$9+$10+$11+$12+$13+$14+$15+$16+$17+$18+$19]}'

but it always zero on the fifth column
# 4  
Old 01-16-2014
Hi, FS needs to be set before the main part, also you need a loop to sum the fields. e.g.:
awk '{s=0; for(i=5; i<=NF; i++) s+=$i; print $1,$2,$3,$4,s}' FS=, OFS=, file

This User Gave Thanks to Scrutinizer For This Post:
# 5  
Old 01-16-2014
big thanks

I still confuse about the statement s=0
Could you please explain more about your code
# 6  
Old 01-16-2014
Hi, s means "sum". The sum is set to zero before the field $5..$NF (last field) values are added by the for loop, for every line of the input file.
This User Gave Thanks to Scrutinizer For This Post:
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