Update dns_nic.sh

dnsapi/dns_nic.sh

@@ -139,7 +139,9 @@ _nic_get_authtoken() {
     _res_arr=$(printf "%s" "$res" | tr -d "\"{}" | tr "," " ");
     
     for r in $_res_arr; do 
-      [[ $(echo $r | grep "access_token") ]] && _auth_token=$(printf "%s" "$r" | sed "s/access_token://")
+      if [ $(echo $r | grep "access_token") ]; then 
+        _auth_token=$(echo $r | sed "s/access_token://")
+      fi
     done
 
     _info "Token received"