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termrc, cpurc: silence /net/ether* error message when there are no ethernet devices

--- a/rc/bin/cpurc

+++ b/rc/bin/cpurc

@@ -59,7 +59,7 @@

 		addrs=`{ndb/query -a sys $sysname ether}

 		if(! ~ $#addrs 0){

 			for(ether in /net/ether*){

-				addr=`{cat $ether/addr}

+				addr=`{cat $ether/addr >[2]/dev/null}

 				switch($addr){

 				case $addrs

 					# try /lib/ndb first, then do dhcp/slaac

--- a/rc/bin/termrc

+++ b/rc/bin/termrc

@@ -60,7 +60,7 @@

 		addrs=`{ndb/query -a sys $sysname ether}

 		if(! ~ $#addrs 0){

 			for(ether in /net/ether*){

-				addr=`{cat $ether/addr}

+				addr=`{cat $ether/addr >[2]/dev/null}

 				switch($addr){

 				case $addrs

 					# try /lib/ndb first, then do dhcp/slaac

-- 

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