Alter Aeon Online Help

Keywords are:  'variables vars'

Format:
variable
variable <varname>
variable <varname> <string>
variable <varname> NULL

Without arguments, the variable command will list what variables you
currently have set.

With a single variable specified, this command will show you what that
variable is set to.

When given a variable name and a string, the variable is created if needed
and the string is stored inside it.  NULL can be used to delete a variable.
The only valid characters for a variable name are a-z, A-Z, 0-9, and
underscore.

Variables can be used in commands by using $varname or $(varname) to
extract the value.  For example:

    say I am hunting $target
    backstab $target
    gossip I am coming to get you, $target!!!!!!

Note that using the $(varname) syntax, with parenthesis, does a recursive
expansion if necessary.  For example:

    var Dentin ppk
    var target Dentin
    say target is $target, target status is $($target)

Using the parenthesis is also the only way to check for empty variables:

    say normal expansion of ->$undefined<-
    say parenthesis expansion of ->$(undefined)<-

We recommended that you use parenthesis expansion when using the 'if'
command.