Make command available accordnig to major mode

[Heime]

I have a file gali.el and want to be able to call the command 
gali-bash only when I am in sh-mode.  What can I do.

;; ----------------------------------------------------

File bovu/bovu-bash.el

(defconst bovu-bash-func
  "FCNAME ()
 {
  ACTN
 }")

(provide 'bovu-bash)

;; -------------------------------------------------------

File gali.el

(defun gali-bash (actm)
  (interactive)
  (insert bovu-bash-func))



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