Rechnen in bash ( German )

file: libmath.sh

#! /bin/bash
 
# Round value to n places
# -----------------------
# Options:	value, places to round to
# Return value:	rounded value
# Use:		round floatnumber decimalplaces returnvalue
 
function round()
{
  # Change a colon to a dot since bc only works with dot as a decimal separator\\
  #  whatever the locale is set to
  value1=$(echo $1 | tr , . )
  value2=$(echo "scale=$2;(((10^$2)*$value1)+0.5)/(10^$2)" | bc)
  # Change the dot back to a colon. Comment the next line out if you do not need this
  value3=$(echo $value2 | tr . , )
  eval "$3='$value3'"			# The return string
};

#! /bin/bash
 
. /pathtolib/libmath.sh
 
amount=4567,4593
round $amount 2 amountR
echo -e "Amount: $AmountR"

Result:
Amount: 4567,46

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