+extern int do_scrub_device (char *device);
+extern int do_scrub_file (char *file);
+extern int do_scrub_freespace (char *dir);
+extern char *do_mkdtemp (char *template);
+extern int do_wc_l (char *path);
+extern int do_wc_w (char *path);
+extern int do_wc_c (char *path);
+extern char **do_head (char *path);
+extern char **do_head_n (int nrlines, char *path);
+extern char **do_tail (char *path);
+extern char **do_tail_n (int nrlines, char *path);
+extern char *do_df (void);
+extern char *do_df_h (void);
+extern int64_t do_du (char *path);