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Sets a variable (by name and value), or set of variables (from file or URL) in Ivy.

Variables are case sensitive.

Contrary to Ant properties, Ivy variables are mutable. But a problem with this is that you do not control when
variables are substituted, and usually it is done as soon as possible. So changing the value of a variable will
have no effect if it has already been substituted. Consequently, *using this task is NOT recommended*.

See link:../reference{outfilesuffix}[reference] page for details about Ivy variables.

== Attributes

[options="header",cols="15%,50%,35%"]
|=======
|Attribute|Description|Required
|name|the name of the variable to set|No
|value|the value of the variable to set|Yes when using the name attribute
|file|the filename of the property file to load as Ivy variables
.2+.^|One of these, when *not* using the name attribute
|url|the URL from which to read Ivy variables
|prefix|Prefix to apply to variables. A dot (`.`) is appended to the prefix if not specified.|No
|settingsRef|A reference to Ivy settings that must be used by this task (*__since 2.0__*)|No, defaults to `ivy.instance`.
|=======