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ip/ppp: rc-quote ipnet value, to prevent accidents.

--- a/sys/src/cmd/ip/ppp/ppp.c

+++ b/sys/src/cmd/ip/ppp/ppp.c

@@ -1597,7 +1597,7 @@

 		if(gate != nil)

 			fprint(shell, "-g %I ", gate);

 		if(ipnet != nil)

-			fprint(shell, "-i %s ", ipnet);

+			fprint(shell, "-i %q ", ipnet);

 	}

 	/* allow dhcpv6 */

 	if(duid != nil)

-- 

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