Server Administration > Automate Tasks and Calculate Data Using Event Triggers > What Is an Event Trigger? > Operators
  
Operators
Most of the operators used in trigger scripts are similar to other programming languages; however, there are some slight differences. For example, there is a fundamental difference between the assignment operator “=“ and the comparison operator “==“. Be careful not to use “=“ to mean “equal to” in a comparison statement.
* 
The string operator “+” is very useful for constructing error and log messages in trigger scripts.
The following tables outlines operators used in script triggers:
Arithmetic Operators
Comparison Operators
Addition: +
Subtraction: -
Multiplication: *
Division: /
Modulus: %
Increment: ++
Decrement: --
Is equal to: ==
Is not equal to: !=
Greater than: >
Greater than or equal to: >=
Less than: <
Less than or equal to: <=
Logical Operators
String Operators
And: &&
Or: ||
Not: !
Assignment: =
Concatenate: +
Concatenate and assign: +=