Diagnostic messages belong on stderr, not stdout. SUSv3 specifies that

renice may not use stdout at all.

1 files changed, 2 insertions, 1 deletions

diff --git a/usr.bin/renice/renice.c b/usr.bin/renice/renice.c
index d1d6440..effa8cf 100644
--- a/usr.bin/renice/renice.c
+++ b/usr.bin/renice/renice.c
@@ -142,7 +142,8 @@ donice(int which, int who, int prio, int incr)
 		warn("%d: setpriority", who);
 		return (1);
 	}
-	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
+	fprintf(stderr, "%d: old priority %d, new priority %d\n", who,
+	    oldprio, prio);
 	return (0);
 }