Question

37

How to round decimals using bc in bash?

rated 0 times [ 37] [ 0] / answers: 1 / hits: 164922 / 2 Years ago, sat, october 29, 2022, 2:52:40

A quick example of what I want using bash scripting:

#!/bin/bash

echo "Insert the price you want to calculate:"

read float

echo "This is the price without taxes:"

echo "scale=2; $float/1.18" |bc -l

read -p "Press any key to continue..."

bash scriptname.sh

Assuming that the price is: 48.86
The answer will be:41.406779661 (41.40 actually because I'm using scale=2;)

My Question is:
How I round the second decimal to show the answer in this way?: 41.41

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answered 2 Years ago memorrappin · Accepted Answer

A bash round function:

round()

{

echo $(printf %.$2f $(echo "scale=$2;(((10^$2)*$1)+0.5)/(10^$2)" | bc))

};

Used in your code example:

#!/bin/bash

# the function "round()" was taken from 

# http://stempell.com/2009/08/rechnen-in-bash/



# the round function:

round()

{

echo $(printf %.$2f $(echo "scale=$2;(((10^$2)*$1)+0.5)/(10^$2)" | bc))

};



echo "Insert the price you want to calculate:"

read float

echo "This is the price without taxes:"

#echo "scale=2; $float/1.18" |bc -l

echo $(round $float/1.18 2);

read -p "Press any key to continue..."

Good luck :o)