extern char *do_hexdump (char *path);
extern int do_zerofree (char *device);
extern int do_pvresize (char *device);
-extern int do_sfdisk_N (char *device, int n, int cyls, int heads, int sectors, char *line);
+extern int do_sfdisk_N (char *device, int partnum, int cyls, int heads, int sectors, char *line);
extern char *do_sfdisk_l (char *device);
extern char *do_sfdisk_kernel_geometry (char *device);
extern char *do_sfdisk_disk_geometry (char *device);
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);