diff --git a/connect-base/2.7/docker-entrypoint.sh b/connect-base/2.7/docker-entrypoint.sh
index e3083c5d..f791d23a 100755
--- a/connect-base/2.7/docker-entrypoint.sh
+++ b/connect-base/2.7/docker-entrypoint.sh
@@ -276,7 +276,7 @@ case $1 in
           env_var=`echo "$VAR" | sed -r "s/([^=]*)=.*/\1/g"`
           prop_name=`echo "$VAR" | sed -r "s/^CONNECT_([^=]*)=.*/\1/g" | tr '[:upper:]' '[:lower:]' | tr _ .`
           prop_value=`echo "$VAR" | sed -r "s/^CONNECT_[^=]*=(.*)/\1/g"`
-          if egrep -q "(^|^#)$prop_name=" $KAFKA_HOME/config/log4j.properties; then
+          if grep -Eq "(^|^#)$prop_name=" $KAFKA_HOME/config/log4j.properties; then
               #note that no config names or values may contain an '@' char
               sed -r -i "s@(^|^#)($prop_name)=(.*)@\2=${prop_value}@g" $KAFKA_HOME/config/log4j.properties
           else
@@ -304,7 +304,7 @@ case $1 in
           if [[ $env_var =~ ^CONNECT_ ]]; then
             prop_name=`echo "$VAR" | sed -r "s/^CONNECT_([^=]*)=.*/\1/g" | tr '[:upper:]' '[:lower:]' | tr _ .`
             prop_value=`echo "$VAR" | sed -r "s/^CONNECT_[^=]*=(.*)/\1/g"`
-            if egrep -q "(^|^#)$prop_name=" $KAFKA_HOME/config/connect-distributed.properties; then
+            if grep -Eq "(^|^#)$prop_name=" $KAFKA_HOME/config/connect-distributed.properties; then
                 #note that no config names or values may contain an '@' char
                 sed -r -i "s@(^|^#)($prop_name)=(.*)@\2=${prop_value}@g" $KAFKA_HOME/config/connect-distributed.properties
             else
diff --git a/kafka/2.7/docker-entrypoint.sh b/kafka/2.7/docker-entrypoint.sh
index 920d8c79..36a58e46 100755
--- a/kafka/2.7/docker-entrypoint.sh
+++ b/kafka/2.7/docker-entrypoint.sh
@@ -151,7 +151,7 @@ case $1 in
           env_var=`echo "$VAR" | sed "s/=.*//"`
           if [[ $env_var =~ ^KAFKA_ && $env_var != "KAFKA_VERSION" && $env_var != "KAFKA_HOME"  && $env_var != "KAFKA_LOG4J_OPTS" && $env_var != "KAFKA_JMX_OPTS" ]]; then
             prop_name=`echo "$VAR" | sed -r "s/^KAFKA_(.*)=.*/\1/g" | tr '[:upper:]' '[:lower:]' | tr _ .`
-            if egrep -q "(^|^#)$prop_name=" $KAFKA_HOME/$CONFIG_FILE; then
+            if grep -Eq "(^|^#)$prop_name=" $KAFKA_HOME/$CONFIG_FILE; then
                 #note that no config names or values may contain an '@' char
                 sed -r -i "s%(^|^#)($prop_name)=(.*)%\2=${!env_var}%g" $KAFKA_HOME/$CONFIG_FILE
             else