Are there alternatives to expr?

Yes, there are several alternatives to expr for performing arithmetic operations in a shell. Here are a few common ones:

Arithmetic Expansion: You can use $((...)) for arithmetic operations.
```
result=$((5 + 3))
echo $result  # Outputs: 8
```
let Command: The let command allows you to perform arithmetic without needing to use expr.
```
let result=5+3
echo $result  # Outputs: 8
```
bc Command: bc is a calculator language that can handle more complex calculations.
```
echo "5 + 3" | bc  # Outputs: 8
```
Python: If you have Python installed, you can use it for calculations.
```
python -c "print(5 + 3)"  # Outputs: 8
```

These alternatives can be more flexible and easier to use for various calculations. If you need more details on any of these methods, let me know!