Test if '/etc/resolv.conf' exists and then back it up to $tmpfile.

Now we even can work with no file at all and create it to add our
nameserver

1 files changed, 1 insertions, 1 deletions

diff --git a/root/usr/bin/changedns b/root/usr/bin/changedns
index 8270e86..5059d08 100755
--- a/root/usr/bin/changedns
+++ b/root/usr/bin/changedns
@@ -1,42 +1,42 @@
 #!/bin/sh
 
 arg0="`basename $0`"	# base portion of our filename
 arg1="$1"
 tmpfile="/tmp/resolv.conf.$$"
 
 usage ( ) {
 	echo "usage: $arg0 -a|-r {ip} [{ip}...]"
 	rm -f $tmpfile
 	exit 1
 }
 
 
 [ "$#" -le 1 ] && usage
 
 shift
 
-cp /etc/resolv.conf $tmpfile
+[ -f /etc/resolv.conf ] && cp /etc/resolv.conf $tmpfile
 
 case "$arg1" in
 	"-a")
 		for ip in "$@"; do
 		    echo $ip
 			grep -sq "^nameserver $ip\$" $tmpfile || echo "nameserver $ip" >>$tmpfile
 		done
 	;;
 	"-r")
 		for ip in "$@"; do
 			grep -v "^nameserver $ip\$" $tmpfile >$tmpfile.2
 			mv $tmpfile.2 $tmpfile
 		done
 	;;
 	*)
 		usage
 	;;
 esac
 
 [ -f $tmpfile ] && cp $tmpfile /etc/resolv.conf
 rm -f $tmpfile
 
 exit 0