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# 1  
Old 08-03-2009

How to calculate percentage of two values in unix.
# 2  
Old 08-03-2009
$ echo '21/42*100' | bc -l

Substitute the values for whatever you need.
# 3  
Old 08-04-2009
Thanks pludi
# 4  
Old 08-04-2009
With percentages try to do the multiply before the divide.

#Lots of decimal places
echo '(21*100)/42'|bc -l

#Two decimal places
echo 'scale=2;(21*100)/42'|bc 

# 5  
Old 08-04-2009
Originally Posted by methyl
With percentages try to do the multiply before the divide.
Less important in bc. But if you don't need decimal places, you can do it in shell by that principle:

$ PERCENT=$(( (4*100)/5 ))
$ echo $PERCENT

# 6  
Old 08-04-2009
Just as important in "bc".

The answer here should be 5% .

echo '10/200*100'|bc

echo '(10*100)/200'|bc


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