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Working out percentage in shell script

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# 8  
Old 01-29-2017
Note that if you're willing to use a 1993 or later Korn shell instead of bash, it is happy to perform arithmetic substitutions in floating point:
Code:
$ sum1=7513
$ sum2=9150
$ echo $((sum1 * 100./sum2))
82.1092896174863388
$ printf '%.2f\n' $((sum1 * 100./sum2))
82.11
$

Note that if the decimal point had been omitted in the calculation marked above in red, ksh would have used integer arithmetic instead of floating point.
# 9  
Old 01-30-2017
IMPORTANT!

If you are using a DEFAULT CygWin(64) install then you only have one choice for floating point maths, awk , all other commands and languages do not exist...

The current CygWin(64) shell is bash Version 4.3.4.
Example:-

awk 'BEGIN { printf "%.2f\n", ( 1.517 / 0.713 ) }'

Rounds up to the second decimal place.
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