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walk: error on mutually exclusive flags

--- a/sys/src/cmd/walk.c

+++ b/sys/src/cmd/walk.c

@@ -266,6 +266,9 @@

 		usage();

 	}ARGEND;

+	if(!printfiles && !printdirs)

+		sysfatal("mutually exclusive flags: -f and -d");

+

 	fmtinstall('M', dirmodefmt);

 	if((bout = Bfdopen(1, OWRITE)) == nil)

-- 

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