(add-hook 'eshell-mode-hook
          '(lambda ()
             (progn
               (setq eshell-path-env (concat "/usr/local/bin:" eshell-path-env))

               (define-key eshell-mode-map "\M-s" 'other-window-or-split)

               (add-to-list 'eshell-command-aliases-list (list "ls" "ls -la"))
               (add-to-list 'eshell-command-aliases-list (list "ll" "ls -la"))
               )))