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How to add two variables in shell script
1. initialize two variables
2. Add two variables directly using $(...) or by using external program expr
3. Echo the final result.
Add two variables without using expr in shell script
#shell program to add two variables var1=10 var2=20 sum=$(($var1 + $var2)) echo $sum
Output
30
Add two variables using expr in shell script
#shell program to add two variables var1=10 var2=20 sum=`expr $var1 + $var2` echo $sum
Output
30
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