diff --git a/performance_tests.sh b/performance_tests.sh
index 49215c4..a58a256 100755
--- a/performance_tests.sh
+++ b/performance_tests.sh
@@ -41,7 +41,6 @@ get_bandwidth(){
         bw=${bw#*,}
     elif [ "$1" = "fetching_text" ]; then
         bw=$(grep -e  "\->" fetching_text| grep -o "[[:digit:].]* -> [[:digit:].]* [[:alpha:]]*")
-        echo "bw vaut $bw"
     fi
 }
 
@@ -108,7 +107,7 @@ test4(){
     run git pull origin main &> /dev/null
     get_storage_used .
     echo "memory usage: $mem"
-    echo "bandwidth usage unknown"
+    echo "bandwidth usage : unknown"
     cd ..
     run rm -rf $REPO_NAME
 }
@@ -140,7 +139,7 @@ test5(){
     echo "memory usage: +$mem"
     echo "bandwidth usage: $bw"
     cd ../$REMOTE
-    git reset --hard -q a99be63309fc4f4600210000583546d966d12d4f
+    git reset --hard -q HEAD~1
     cd ../..
     rm -rf performance_testing
 }
@@ -149,10 +148,9 @@ test6(){
     section TEST6
     run echo 'TEST 6 : case of classic fetching and merging, after removal of a 1M file'
     #initialization
-    run git clone $1 &> /dev/null
+    pwd
+    run git clone $1 #&> /dev/null
     cd $REPO_NAME
-    run git fetch --progress origin &> /dev/null
-    run git merge --progress origin &> /dev/null
     get_storage_used .
     mem_before=$mem
     #modification of the remote repo  
@@ -171,7 +169,7 @@ test6(){
     echo "memory usage: $mem"
     echo "bandwidth usage: $bw"
     cd ../$REMOTE
-    git reset --hard -q a99be63309fc4f4600210000583546d966d12d4f
+    git reset --hard -q HEAD~1
     cd ../..
     rm -rf performance_testing
 }
@@ -182,8 +180,6 @@ test7(){
     #initialization
     run git clone $1 &> /dev/null
     cd $REPO_NAME
-    run git fetch --progress origin &> /dev/null
-    run git merge --progress origin &> /dev/null
     get_storage_used .
     mem_before=$mem 
     #modification of the remote repo  
@@ -197,14 +193,14 @@ test7(){
     cd ../../$REPO_NAME
     #fetching
     run git fetch --progress origin &> /dev/null
-    run git merge --progress &> /dev/null
+    run git merge --progress &> fetching_text
     get_storage_used .
     mem_after=$mem
     mem=$(($mem_after-$mem_before))
     echo "memory usage: $mem"
-    echo "bandwidth usage unknown"
+    echo "bandwidth usage : unknown"
     cd ../$REMOTE
-    git reset --hard -q a99be63309fc4f4600210000583546d966d12d4f
+    git reset --hard -q HEAD~2
     cd ../..
     rm -rf performance_testing
 }
@@ -213,10 +209,9 @@ test8(){
     section TEST8
     run echo 'TEST 8 : case of fetching --depth=1 and merging, after addition of a 1M file'
     #initialization
-    run git clone $1 #&> /dev/null
+    echo $(pwd)
+    run git clone $1 &> /dev/null
     cd $REPO_NAME
-    run git fetch --progress origin &> fetching1 #&> /dev/null  is this useless?
-    run git merge --progress origin &> merging1 #&> /dev/null
     get_storage_used .
     mem_before=$mem
     #modification of the remote repo  
@@ -225,8 +220,8 @@ test8(){
     run git add sample5 
     run git commit --quiet -m"fourth 1M sample created"
     cd ../../$REPO_NAME
-    run git fetch --progress --depth=1 origin &> fetching2 # /dev/null
-    run git merge --progress --allow-unrelated-histories &> merging2
+    run git fetch --progress --depth=1 origin &> /dev/null
+    run git merge --progress --allow-unrelated-histories &> fetching_text
     get_storage_used .
     mem_after=$mem
     mem=$(($mem_after-$mem_before))
@@ -234,19 +229,17 @@ test8(){
     echo "memory usage: +$mem"
     echo "bandwidth usage: $bw"
     cd ../$REMOTE
-    git reset --hard -q a99be63309fc4f4600210000583546d966d12d4f #does not work cause commits change numbers 
+    git reset --hard -q HEAD~1 #does not work cause commits change numbers 
     cd ../..
-    #rm -rf performance_testing
+    rm -rf performance_testing
 }
 
 test9(){
-        section TEST9
+    section TEST9
     run echo 'TEST 9 : case of --depth=1 fetching and merging, after removal of a 1M file'
     #initialization 
     run git clone $1 &> /dev/null
     cd $REPO_NAME
-    run git fetch --progress origin &> /dev/null
-    run git merge --progress origin &> /dev/null
     get_storage_used .
     mem_before=$mem
     #modification of the remote repo  
@@ -257,15 +250,14 @@ test9(){
     cd ../../$REPO_NAME
     #fetching
     run git fetch --progress --depth=1 origin &> /dev/null
-    run git merge --progress &> fetching_text
+    run git merge --progress --allow-unrelated-histories  &> /dev/null
     get_storage_used .
     mem_after=$mem
     mem=$(($mem_after-$mem_before))
-    get_bandwidth fetching_text
     echo "memory usage: $mem"
-    echo "bandwidth usage: $bw"
+    echo "bandwidth usage: unknown"
     cd ../$REMOTE
-    git reset --hard -q a99be63309fc4f4600210000583546d966d12d4f
+    git reset --hard -q HEAD~1
     cd ../..
     rm -rf performance_testing
 }
@@ -278,8 +270,7 @@ test10(){
     run git fetch --progress origin &> /dev/null
     run git merge --progress origin &> /dev/null
     get_storage_used .
-    mem_before=$mem 
-    echo "mem before is $mem_before"
+    mem_before=$mem
     #modification of the remote repo  
     cd ../$REMOTE
     create_random_file 'sample5' '1M' #adding a 1M file
@@ -290,16 +281,15 @@ test10(){
     run git commit --quiet -m"1M "sample5" deleted"
     cd ../../$REPO_NAME
     #fetching
-    run git fetch --progress --depth=1 origin &> /fetching_text #dev/null
-    run git merge --progress &> merging_text #/dev/null
+    run git fetch --progress --depth=1 origin &> /dev/null
+    run git merge --progress --allow-unrelated-histories &> /dev/null
     get_storage_used .
     mem_after=$mem
-    echo "mem after is $mem_before"
     mem=$(($mem_after-$mem_before))
     echo "memory usage: $mem"
-    echo "bandwidth usage unknown"
+    echo "bandwidth usage : unknown"
     cd ../$REMOTE
-    git reset --hard -q a99be63309fc4f4600210000583546d966d12d4f
+    git reset --hard -q HEAD~2
     cd ../..
     rm -rf performance_testing
 }