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Hi,
In rev 1.23, warn.c was changed to call check_sender(), to fix PR/7713.
Unfortunably this breaks warn when called from a script, which doesn't have a
tty (it will exit with "can't find your tty" error message). The attached
patch fix this, by not calling check_sender() if we're not on a tty.

Is it OK to commit ?

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
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Index: wall.c
===================================================================
RCS file: /cvsroot/src/usr.bin/wall/wall.c,v
retrieving revision 1.24
diff -u -r1.24 wall.c
--- wall.c	7 Aug 2003 11:17:14 -0000	1.24
+++ wall.c	26 Oct 2004 17:59:21 -0000
@@ -101,7 +101,8 @@
 		err(1, "setegid");
 	pw = getpwnam("nobody");
 
-	(void)check_sender(&atime, getuid(), egid);
+	if (isatty(fileno(stdin)))
+		(void)check_sender(&atime, getuid(), egid);
 
 	while ((ch = getopt(argc, argv, "g:n")) != -1)
 		switch (ch) {

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