How do I enumerate all the defined variables in a groovy script

Actually, Ted's answer will also work for 'def'ed variables.

def foo = "abc"
def bar = "def"

if (true) {
    baz = "ghi"
    this.binding.variables.each {k,v -> println "$k = $v"}
}

yields

baz = ghi
__ = [null, null, null]
foo = abc
_ = null
bar = def

I'm not sure what the _-variables signify, but I'm sure you can work around them.

Well, if you're using a simple script (where you don't use the "def" keyword), the variables you define will be stored in the binding and you can get at them like this:

foo = "abc"
bar = "def"

if (true) {
    baz = "ghi"
    this.binding.variables.each {k,v -> println "$k = $v"}
}

Prints:

    foo = abc 
    baz = ghi 
    args = {} 
    bar = def

I'm not aware of an easy way to enumerate through the variables defined with the "def" keyword, but I'll be watching this question with interest to see if someone else knows how.