eshell-variable-aliases-list

eshell-variable-aliases-list is a variable defined in `esh-var.el'.
Its value is shown below.

• This variable may be risky if used as a file-local variable.

Documentation:
This list provides aliasing for variable references.
It is very similar in concept to what `eshell-user-aliases-list' does
for commands. Each member of this defines the name of a command,
and the Lisp value to return for that variable if it is accessed
via the syntax '$NAME'.

If the value is a function, that function will be called with two
arguments: the list of the indices that was used in the reference, and
whether the user is requesting the length of the ultimate element.
For example, a reference of '$NAME[10][20]' would result in the
function for alias `NAME' being called (assuming it were aliased to a
function), and the arguments passed to this function would be the list
'(10 20)', and nil.

You can customize this variable.

Value:

(("COLUMNS"
  (lambda
    (indices)
    (window-width))
  t)
 ("LINES"
  (lambda
    (indices)
    (window-height))
  t)
 ("_"
  (lambda
    (indices)
    (if
	(not indices)
	(car
	 (last eshell-last-arguments))
      (eshell-apply-indices eshell-last-arguments indices))))
 ("?" eshell-last-command-status)
 ("$" eshell-last-command-result)
 ("0" eshell-command-name)
 ("1"
  (lambda
    (indices)
    (nth 0 eshell-command-arguments)))
 ("2"
  (lambda
    (indices)
    (nth 1 eshell-command-arguments)))
 ("3"
  (lambda
    (indices)
    (nth 2 eshell-command-arguments)))
 ("4"
  (lambda
    (indices)
    (nth 3 eshell-command-arguments)))
 ("5"
  (lambda
    (indices)
    (nth 4 eshell-command-arguments)))
 ("6"
  (lambda
    (indices)
    (nth 5 eshell-command-arguments)))
 ("7"
  (lambda
    (indices)
    (nth 6 eshell-command-arguments)))
 ("8"
  (lambda
    (indices)
    (nth 7 eshell-command-arguments)))
 ("9"
  (lambda
    (indices)
    (nth 8 eshell-command-arguments)))
 ("*"
  (lambda
    (indices)
    (if
	(not indices)
	eshell-command-arguments
      (eshell-apply-indices eshell-command-arguments indices)))))