What are other expr operators?

In addition to the basic arithmetic operators, the expr command in Linux supports several other operators for string and logical operations. Here’s a concise overview of the operators you can use with expr:

Arithmetic Operators

Addition: +
```
expr 5 + 3  # Outputs: 8
```
Subtraction: -
```
expr 5 - 3  # Outputs: 2
```
Multiplication: * (must be escaped or quoted)
```
expr 5 \* 3  # Outputs: 15
```
Division: /
```
expr 6 / 3  # Outputs: 2
```
Modulus: % (remainder of division)
```
expr 5 % 3  # Outputs: 2
```

String Operators

String Length: To find the length of a string, use the length function:
```
expr length "Hello"  # Outputs: 5
```

String Comparison: You can compare strings using = or !=:

expr "Hello" = "Hello"  # Outputs: 1 (true)
expr "Hello" != "World"  # Outputs: 1 (true)

Logical Operators

Logical AND: &
```
expr 1 \& 1  # Outputs: 1 (true)
```
Logical OR: |
```
expr 0 \| 1  # Outputs: 1 (true)
```

Comparison Operators

Greater Than: >
```
expr 5 \> 3  # Outputs: 1 (true)
```
Less Than: <
```
expr 5 \< 3  # Outputs: 0 (false)
```
Greater Than or Equal To: >=
```
expr 5 \>= 5  # Outputs: 1 (true)
```
Less Than or Equal To: <=
```
expr 5 \<= 5  # Outputs: 1 (true)
```

Summary

The expr command is versatile, allowing for various arithmetic, string, and logical operations. Remember to use spaces around operators and escape special characters like *, &, and | to avoid syntax errors.

If you're interested in practicing these operators, consider trying them out in your terminal or exploring related LabEx labs on shell scripting and command-line utilities. Let me know if you have any more questions!