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
@@ -6,25 +6,25 @@ 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