From d6aff89bbb0ff229351ba76d85bd6728bc8f366b Mon Sep 17 00:00:00 2001
From: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Mon, 30 Mar 2015 21:24:46 +0200
Subject: [PATCH] tail: allow tail -n 0 or tail -0

fix a crash, but allow this option.
---
 tail.c | 3 +++
 tr.c   | 1 -
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/tail.c b/tail.c
index 6d02914..888dd47 100644
--- a/tail.c
+++ b/tail.c
@@ -106,6 +106,9 @@ main(int argc, char *argv[])
 		usage();
 	} ARGEND;
 
+	if (!num)
+		return 0;
+
 	if (!argc)
 		tail(stdin, "<stdin>");
 	else {
diff --git a/tr.c b/tr.c
index 3d067bc..5dcc307 100644
--- a/tr.c
+++ b/tr.c
@@ -39,7 +39,6 @@ static struct range *set2        = NULL;
 static size_t set2ranges         = 0;
 static int    (*set2check)(Rune) = NULL;
 
-
 static size_t
 rangelen(struct range r)
 {