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chvt: usage using argv0

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Hiltjo Posthuma 2015-02-02 19:56:17 +01:00 committed by sin
parent a46944add9
commit f0cfd58e93
1 changed files with 4 additions and 1 deletions
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5
chvt.c
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@ -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();