5.7.15 if else and endif keywords

The if, else and endif keywords can be used for conditional execution in the script. The condition for if must be variable or value. Value 0 and string "false" (case insensitive) is interpreted as false, other values as true. If block must always be closed with endif keyword. Nesting of if-blocks is supported.

     var v
     if v
       print is true
     else
       print is false
     endif