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awk - arithemetic functions with external variables

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# 1  
Old 11-30-2007
awk - arithemetic functions with external variables
I'm trying to get awk to do arithmetic functions with external variables and I'm getting an error that I cannot figure out how to fix.

Insight would be appreciated

Code:
        money=$1
        rate1=$(awk -F"\t " '/'$converting'/{print $3}' convert.table)
        rate2=$(awk -F"\t" '/'$converted'/{print $3}' convert.table)
        awk -F"\t" '{printf '$rate2'/'$rate1'*'$money'}'

OUTPUT

awk: cmd. line:1: {printf 3.3513
awk: cmd. line:1: ^ unexpected newline or end of string
# 2  
Old 12-01-2007
You cannot pass external variables into awk in the manner that you are attempting to use.

Try:

Code:
awk -F"\t" -v rate1=$rate1 -v rate2=$rate2 -v money=$money '{print rate2/rate1*money}'

# 3  
Old 12-01-2007
I'm not at a UNIX machine now, but this should work:

Code:
        money=$1
        rate1=$(awk -F"\t " '/'$converting'/{print $3}' convert.table)
        rate2=$(awk -F"\t" '/'$converted'/{print $3}' convert.table)
        awk -F"\t" '{printf r2/r1*m}' r2=$rate2 r1=$rate1 m=$money

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