operator
switch expression | switch expression
The operator | is a logical operator that evaluates to true if either or both of the operands
evaluates to true. If both evaluate to false, then the result of | is also false. If the left-hand operand evaluates to true, the second is not evaluated.
For example:
do when a < b | c < d output "Hello, World!%n" done
The keyword or is a deprecated form of |.