UNIX Command Line

As "expr" does not help in float computations, here are some of the alternatives

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float computations using bc
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$ Number=`echo 80 \* 10.69 | bc`; echo $Number

855.20

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float computations using awk
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$ Number=`(echo - | awk '{ print 80*10.69}')`; echo $Number

855.2

And if you are supplying something from outside

$ Number=`(echo - | awk '{ print 80*10.69}')`; echo $Number

855.2

One more way of passing variables to AWK

$ S=80; Number=`echo - | awk -v K=$S '{ print K*10.69}'` ; echo $Number

855.2