[hackers] [ubase] chvt: usage using argv0 || Hiltjo Posthuma

[git]

commit f0cfd58e932e01a7aad5d923aa4e558a02ff404e
Author: Hiltjo Posthuma <hil...@codemadness.org>
Date:   Mon Feb 2 19:56:17 2015 +0100

    chvt: usage using argv0

diff --git a/chvt.c b/chvt.c
index 5394588..95e4ff8 100644
--- a/chvt.c
+++ b/chvt.c
@@ -25,7 +25,7 @@ static char *vts[] = {
 static void
 usage(void)
 {
-       eprintf("usage: chvt N\n");
+       eprintf("usage: %s N\n", argv0);
 }
 
 int
@@ -35,6 +35,9 @@ main(int argc, char *argv[])
        int fd;
        char c;
 
+       ARGBEGIN {
+       } ARGEND;
+
        if (argc != 2 || strspn(argv[1], "1234567890") != strlen(argv[1]))
                usage();