diff --git a/select b/select
index 5129f1b..0c7816e 100755
--- a/select
+++ b/select
@@ -5,33 +5,39 @@ md5_source_rm="2rm.md5"
 
 md5_aim="aim.md5"
 
+
+md5_aim_tmp="$(mktemp)"
+cat "${md5_aim}" > $md5_aim_tmp
+md5_source_tmp="$(mktemp)"
+cat "${md5_source}" > $md5_source_tmp
+echo "2cp file: '$md5_source_tmp'"
+
 #wenn delete file exits -> handle deletons (importand for konflict handling
 [ -f "${md5_source_rm}" ] && {
   cat "${md5_source_rm}"  | cut -c -32 | while read line; do
-    sed -i "/$line/d" "${md5_aim}"
+    sed -i "/$line/d" "${md5_aim_tmp}"
   done
   cat "${md5_source_rm}"  | cut -c 35- | while read line; do
-    l=$(grep "  $line"$ "${md5_aim}")
+    l=$(grep "  $line"$ "${md5_aim_tmp}")
     [ -n "$l" ] && {
       echo $l
       md5=$(echo $l | cut -c -32)
-      sed -i "/$md5/d" "${md5_aim}"
+      sed -i "/$md5/d" "${md5_aim_tmp}"
     }
   done
-  rm ${md5_source_rm}
 }
 
 #gleiche dateien anhand md5 aussortieren
-cat "${md5_aim}" | cut -c -32 | while read line; do sed -i "/$line/d" "${md5_source}" ; done
+cat "${md5_aim_tmp}" | cut -c -32 | while read line; do sed -i "/$line/d" "${md5_source_tmp}" ; done
 
 #dateien die verschiedenen md5 haben aber bei beiden existieren als konflikte behandeln
 echo Konflicts:
 echo
-cat "${md5_aim}" | cut -c 35- | while read line; do
-  l=$(grep "  $line"$ "${md5_source}" | tee -a konflicts)
+cat "${md5_aim_tmp}" | cut -c 35- | while read line; do
+  l=$(grep "  $line"$ "${md5_source_tmp}" | tee -a konflicts)
   [ -n "$l" ] && {
     echo $l
     md5=$(echo $l | cut -c -32)
-    sed -i "/$md5/d" "${md5_source}"
+    sed -i "/$md5/d" "${md5_source_tmp}"
   }
 done