- usage of operators
[EQU arg1 arg2 ...]
- If all args are same, returns "1", or else returns "0".
+ If all args are the same as arg1, returns "1", or else returns "0".
[IOR arg1 arg2 ...]
[AND arg1 arg2 ...]
IOR evaluates and returns all args' logical OR. IAND is logical AND.