diff --git a/test/reproducers/567404/UpstreamRhinoClassPathTest.java b/test/reproducers/567404/UpstreamRhinoClassPathTest.java
index 4f8989d..ef68e4f 100644
--- a/test/reproducers/567404/UpstreamRhinoClassPathTest.java
+++ b/test/reproducers/567404/UpstreamRhinoClassPathTest.java
@@ -1,5 +1,3 @@
-
-
 import org.mozilla.javascript.NativeCall;
 
 /**
diff --git a/test/reproducers/567404/runtest.sh b/test/reproducers/567404/runtest.sh
index e874ce8..6c1a49c 100755
--- a/test/reproducers/567404/runtest.sh
+++ b/test/reproducers/567404/runtest.sh
@@ -9,7 +9,7 @@ fi
 
 $JAVAC -d . $TESTSRC/TestScript.java
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Compilation1 failed"
   exit $R
 fi
@@ -18,14 +18,14 @@ $JAVA -cp . TestScript &> log1
 #$TESTSRC/rhino-1.5r5.jar ?
 R=$?
 cat log1
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Run1 failed"
   exit $R
 fi
 
 grep "Scripting components FOUND successfully." log1
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "grep1 failed"
   exit $R
 fi
@@ -33,7 +33,7 @@ fi
 $JAVAC -d . -cp $TESTSRC/rhino-1.5r5.jar $TESTSRC/UpstreamRhinoClassPathTest.java &> log2
 R=$?
 cat log2
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Compilation2 failed"
   exit $R
 fi
@@ -41,11 +41,11 @@ fi
 cat log2
 ls -l
 
-if [[ !  -z `cat log2 | grep -v \
+if [ !  -z `cat log2 | grep -v \
                              -e "^Picked up JAVA_TOOL_OPTIONS:" \
                              -e "^Started recording"  \
                              -e "myrecording.jfr$" `
-   ]] ; then
+   ] ; then
   echo "Empty output"
   exit 100
 fi
diff --git a/test/reproducers/6656625/Test.sh b/test/reproducers/6656625/Test.sh
index 624a44c..22ab26d 100644
--- a/test/reproducers/6656625/Test.sh
+++ b/test/reproducers/6656625/Test.sh
@@ -6,20 +6,20 @@ JAVA=${TESTJAVA}${FS}bin${FS}java
 
 $JAVAC -d . $TESTSRC/Test.java 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Compilation failed"
   exit $R
 fi
 cp -v $TESTSRC/test.png . 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Copy of resource failed"
   exit $R
 fi
 
 $JAVA  Test 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "run  failed"
   exit $R
 fi
@@ -27,7 +27,7 @@ fi
 
 ls test.png
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "no image here"
   exit $R
 fi
diff --git a/test/reproducers/6804996/Test.sh b/test/reproducers/6804996/Test.sh
index ab54bef..f0b7065 100644
--- a/test/reproducers/6804996/Test.sh
+++ b/test/reproducers/6804996/Test.sh
@@ -6,40 +6,40 @@ JAVA=${TESTJAVA}${FS}bin${FS}java
 
 $JAVAC -d . $TESTSRC/Test.java 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Compilation failed"
   exit $R
 fi
 cp -v $TESTSRC/splash.png . 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Copy of resource failed"
   exit $R
 fi
 
 $JAVA -splash:splash.png -showversion Test > LOG
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "run  failed"
   exit $R
 fi
 
 cat LOG
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "no log"
   exit $R
 fi
 
 grep splash.png LOG
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "no spalsh in log"
   exit $R
 fi
 
 grep "done" LOG
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "testnot done"
   exit $R
 fi
diff --git a/test/reproducers/6804998/Test.sh b/test/reproducers/6804998/Test.sh
index 0cdddbc..ab9620d 100644
--- a/test/reproducers/6804998/Test.sh
+++ b/test/reproducers/6804998/Test.sh
@@ -6,20 +6,20 @@ JAVA=${TESTJAVA}${FS}bin${FS}java
 
 $JAVAC -d . $TESTSRC/Test.java 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Compilation failed"
   exit $R
 fi
 cp -v $TESTSRC/test.gif . 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Copy of resource failed"
   exit $R
 fi
 
 $JAVA  Test 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "run  failed"
   exit $R
 fi
@@ -27,7 +27,7 @@ fi
 
 ls test.gif
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "no image here"
   exit $R
 fi
diff --git a/test/reproducers/6823373/Test.sh b/test/reproducers/6823373/Test.sh
index c1fca5d..43387fa 100644
--- a/test/reproducers/6823373/Test.sh
+++ b/test/reproducers/6823373/Test.sh
@@ -6,40 +6,40 @@ JAVA=${TESTJAVA}${FS}bin${FS}java
 
 $JAVAC -d . $TESTSRC/Test.java 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Compilation failed"
   exit $R
 fi
 cp -v $TESTSRC/splash.jpg . 
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Copy of resource failed"
   exit $R
 fi
 
 $JAVA -splash:splash.jpg -showversion Test > LOG
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "run  failed"
   exit $R
 fi
 
 cat LOG
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "no log"
   exit $R
 fi
 
 grep splash.jpg LOG
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "no spalsh in log"
   exit $R
 fi
 
 grep "done" LOG
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "testnot done"
   exit $R
 fi
diff --git a/test/reproducers/6913047/run.sh b/test/reproducers/6913047/run.sh
index b4e479a..4e1ed09 100644
--- a/test/reproducers/6913047/run.sh
+++ b/test/reproducers/6913047/run.sh
@@ -65,7 +65,7 @@ fi
 
 "$JAVAC" -d . $TESTSRC/Bug6913047.java $EXTFLAGS
 R=$?
-if [[ $R -ne 0 ]]; then
+if [ "0$R" -ne "0" ]; then
   echo "Compilation failed"
   exit $R
 else
diff --git a/test/reproducers/7122141/runtest.sh b/test/reproducers/7122141/runtest.sh
index aa51d8a..27d9b57 100755
--- a/test/reproducers/7122141/runtest.sh
+++ b/test/reproducers/7122141/runtest.sh
@@ -4,7 +4,7 @@ JAVA=${TESTJAVA}${FS}bin${FS}java
 
 $JAVAC -d .  $(find $TESTSRC/annotationinitialisationrace -name \*.java)
 R=$?
-if [[ $R -ne 0 ]] ; then
+if [ "0$R" -ne "0" ] ; then
   echo "Compilation1 failed"
   exit $R
 fi
@@ -13,7 +13,7 @@ java_pid=$!
 sleep 5;
 ps | grep $java_pid
 R=$?
-        if [[ $R -eq 0 ]]; then
+        if [ "0$R" -eq "0" ]; then
             echo "java not finished, see kill -3 bellow"
             kill -3 $java_pid # write info about process
             kill -9 $java_pid # kill it with fire