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Try this,


var="25x24";
first=`echo $var | cut -d 'x' -f 1`
second=`echo $var | cut -d 'x' -f 2`
let result=$first*$second;
echo $result;

Try this ,


str3=$(echo "$str1 \n $str2")
echo -e $str3

use '\b' to match the end of the number ,


[0-9]+0\b