======Synopsis:======
__while__ (<condition>) <action> \\
__while__ (<condition>) [{ <action> }]

======Description:======
The __WHILE__ loop is a sort of hybrid between the [[FOR]] loop and the [[IF]]
control statement.  It allows for repetitive action, as with [[FOR]],
but the loop iterates (performs the action) only if a specific
condition is met, as with [[IF]].

The "condition" portion may contain any comparison or assignment
allowed in an [[IF]] statement.

======Examples:======
To display a warning message 3 times:
      @ xx = 3
      while ( xx > 0 ) {
         echo WARNING!  This ship will self destruct in $xx seconds!
         @ xx--
      }

A infinite loop that behaves like the Unix 'yes' command:
      while ( 1 ) echo yes

======Aliases:======
[[UNTIL]] is the exact opposite of __WHILE__.  It is essentially the same
applying the negation operator (!) to the entire __WHILE__ condition.

======Other Notes:======
__WHILE__ has all of the capabilities of [[FOR]], only in a different syntax.
The distinction between the two is not great enough to warrant a
recommendation of one over the other.  If anything, [[FOR]] tends to be
more concise than __WHILE__; however, this is not always the case.