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-rwxr-xr-xroot/usr/bin/changedns5
1 files changed, 3 insertions, 2 deletions
diff --git a/root/usr/bin/changedns b/root/usr/bin/changedns
index 5059d08..edc48bc 100755
--- a/root/usr/bin/changedns
+++ b/root/usr/bin/changedns
@@ -6,37 +6,38 @@ tmpfile="/tmp/resolv.conf.$$"
usage ( ) {
echo "usage: $arg0 -a|-r {ip} [{ip}...]"
rm -f $tmpfile
exit 1
}
[ "$#" -le 1 ] && usage
shift
-[ -f /etc/resolv.conf ] && cp /etc/resolv.conf $tmpfile
+[ ! -e "/etc/resolv.conf" ] && touch /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
+[ -e $tmpfile ] && cp $tmpfile /etc/resolv.conf
rm -f $tmpfile
exit 0