diff options
Diffstat (limited to 'coreutils/tail.c')
| -rw-r--r-- | coreutils/tail.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/coreutils/tail.c b/coreutils/tail.c index 315eee188..321c5c4b2 100644 --- a/coreutils/tail.c +++ b/coreutils/tail.c @@ -368,8 +368,10 @@ extern int tail_main(int argc, char **argv) case 'h': usage(tail_usage); default: - fprintf(stderr, "tail: invalid option -- %c\n", opt); - usage(tail_usage); + if ((n_units = atoi(&argv[i][1])) < 1) { + fprintf(stderr, "tail: invalid option -- %c\n", opt); + usage(tail_usage); + } } } else { break; |