Mastering Windows PowerShell Scripting - Third Edition

if, else, and elseif

An if statement is written as follows; the statements enclosed by the if statement will execute if the condition evaluates to true:

if (<condition>) { 
    <statements> 
} 

The else statement is optional and will trigger if all previous conditions evaluate to false:

if (<first-condition>) { 
    <first-statements> 
} else { 
    <second-statements> 
} 

The elseif statement allows conditions to be stacked:

if (<first-condition>) { 
    <first-statements> 
} elseif (<second-condition>) { 
    <second-statements> 
} elseif (<last-condition>) { 
    <last-statements> 
}

The else statement may be added after any number of elseif statements.

Execution of a block of conditions stops as soon as a single condition evaluates to true. For example, both the first and ...