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+======Synopsis:======
+__unshift__ <variable name> <word> \\
+__shift__   <variable name>
+======Description:======
+__UNSHIFT__ prepends the given word (or words) to the given variable,
+padded with a single space.  The variable name itself may not contain
+a leading '$'; the command uses the variable itself, not the expanded
+contents.  If the variable does not exist, it is created containing
+the given word(s) (just as if [[ASSIGN]] were used).
+======Aliases:======
+__SHIFT__ is the exact opposite of __UNSHIFT__, in that it chops off the first
+word in the variable.  If there is only one word in the variable, the variable
+is deleted.  Both __UNSHIFT__ and __SHIFT__ are functionally equivalent to the
+$[[unshift function|unshift]]() and $[[shift function|shift]]() functions,
+respectively.