In Bash, you can perform arithmetic operations using various arithmetic operators. Here are the commonly used arithmetic operators in Bash:

- Addition (+): Adds two values together. Example:
`result=$((2 + 3))`

- Subtraction (-): Subtracts one value from another. Example:
`result=$((10 - 5))`

- Multiplication (*): Multiplies two values. Example:
`result=$((4 * 6))`

- Division (/): Divides one value by another. Example:
`result=$((20 / 4))`

- Modulo (%): Computes the remainder of division. Example:
`result=$((15 % 6))`

- Increment (++) and Decrement (–): Increases or decreases the value of a variable by 1. Example:

```
a=5
a=$((a + 1)) # Increment by 1
a=$((a - 1)) # Decrement by 1
```

- Exponentiation (**): Raises one value to the power of another. Example:
`result=$((2 ** 3))`

- Arithmetic expressions within double parentheses (( )): Allows complex arithmetic expressions and evaluation. Example:
`result=$(( (5 + 3) * 2 - 1 ))`

- Arithmetic expansion using $(( )): Evaluates arithmetic expressions within a $(( )) construct. Example:
`result=$(($a + $b))`

Here’s an example that combines different arithmetic operations:

```
#!/bin/bash
a=5
b=3
result1=$((a + b))
result2=$((a * b))
result3=$((a / b))
echo "Result 1: $result1"
echo "Result 2: $result2"
echo "Result 3: $result3"
```

When you run this script, it will output:

```
Result 1: 8
Result 2: 15
Result 3: 1
```

These arithmetic operators allow you to perform mathematical calculations within Bash scripts. You can use them to manipulate numeric values, perform calculations, and make decisions based on arithmetic comparisons.