extern char **guestfs_tail_n (guestfs_h *handle, int nrlines, const char *path);
extern char *guestfs_df (guestfs_h *handle);
extern char *guestfs_df_h (guestfs_h *handle);
extern char **guestfs_tail_n (guestfs_h *handle, int nrlines, const char *path);
extern char *guestfs_df (guestfs_h *handle);
extern char *guestfs_df_h (guestfs_h *handle);