Lists are ordered collections of objects of any type. Lists are entered as a sequence of objects enclosed in curly braces { and }. The syntax rules of each individual object still apply when they are within a list. Lists can contain any number of items, including none, therefore the empty list { } is valid and can be used. Items can be repeated within a list, and the order in which items are inserted is preserved unless the order is intentionally changed, for example using the SORT command.

In most cases, commands will accept a list instead of a single argument and will proceed according to the Parallel Processing with Lists section. For example, lists can be used to quickly apply the same operation to more than one value: