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The Arithmetic expression is very important feature for performing number arithmetic operations in scripts.
By default variables are treated as strings in bash scripts.
But parsing a string to numbers is very easy using double parentheses and external command such as expr.

Arithmetic operations in Bash Shell
Arithmetic operations can be done on integers using the following methods

$(( expression ))
echo "Addition = $(( number_1 + number_2 ))"

expr — evaluate expression
we can also use expr command to perform Arithmetic operations on numbers.

echo "Addition = $(expr $number_1 + $number_2 )"

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