From c8aa23a9cc2a8de24fcd37c5513eb70a6dfd61a3 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Fri, 18 Jan 2002 23:40:06 +0000
Subject: [PATCH] (main): Issue a warning for obsolete usage, unless
 POSIXLY_CORRECT.

---
 src/uniq.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/uniq.c b/src/uniq.c
index c61468c..b3b16ff 100644
--- a/src/uniq.c
+++ b/src/uniq.c
@@ -443,7 +443,13 @@ main (int argc, char **argv)
 		&& optarg[0] == '+'
 		&& xstrtoul (optarg, NULL, 10, &size, "") == LONGINT_OK
 		&& size <= SIZE_MAX)
-	      skip_chars = size;
+	      {
+		if (! posixly_correct)
+		  error (0, 0,
+			 _("warning: `uniq %s' is obsolete; use `uniq -s %s' instead"),
+			 optarg, optarg + 1);
+		skip_chars = size;
+	      }
 	    else if (nfiles == 2)
 	      {
 		error (0, 0, _("extra operand `%s'"), optarg);
-- 
2.7.4