diff --git a/conf/mattermost.conf.sample b/conf/mattermost.conf.sample
index 2443f06..e72a0bf 100644
--- a/conf/mattermost.conf.sample
+++ b/conf/mattermost.conf.sample
@@ -30,6 +30,18 @@ FQHN_HOSTNAME=""
 #MATTERMOST_GROUP=""
 
 
+# MATTERMOST_BASE_INSTALL_PATH
+#
+# The install cwpathdirectory is everything before the first occurrence of 
+# the string /mattermost. In this example, the {install-path} is /opt. If 
+# that command does not produce any results because your version is older, 
+# try whereis platform instead.
+#
+# Defaults to: MATTERMOST_BASE_INSTALL_PATH="/opt"
+#
+#MATTERMOST_BASE_INSTALL_PATH="/opt"
+
+
 # MYSQL_CREDENTIAL_ARGS
 #
 # Giving password on command line is insecure an sind mysql 5.5
diff --git a/upgrade-mattermost.sh b/upgrade-mattermost.sh
new file mode 100755
index 0000000..f38ac65
--- /dev/null
+++ b/upgrade-mattermost.sh
@@ -0,0 +1,714 @@
+#!/usr/bin/env bash
+
+script_name="$(basename $(realpath $0))"
+working_dir="$(dirname $(realpath $0))"
+
+#conf_file="${working_dir}/conf/${script_name%%.*}.conf"
+conf_file="${working_dir}/conf/mattermost.conf"
+
+LOCK_DIR="/tmp/$(basename $0).$$.LOCK"
+log_file="${LOCK_DIR}/${script_name%%.*}.log"
+
+backup_date="$(date +%Y-%m-%d-%H%M)"
+
+
+# ----------
+# Base Function(s)
+# ----------
+
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -rf "$LOCK_DIR"
+   blank_line
+   exit $1
+}
+
+echononl(){
+   if $terminal ; then
+      echo X\\c > /tmp/shprompt$$
+      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+         echo -e -n "   $*\\c" 1>&2
+      else
+         echo -e -n "   $*" 1>&2
+      fi
+      rm /tmp/shprompt$$
+   fi
+}
+fatal(){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mFatal\033[m ] $*"
+   else
+      echo -e "   [ Fatal ] $*"
+   fi
+   echo ""
+   if $terminal ; then
+      echo -e "             \033[1mScript terminated\033[m.."
+   else
+      echo -e "             Script terminated.."
+   fi
+   echo ""
+   rm -rf $LOCK_DIR
+   exit 1
+}
+error (){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mError\033[m ] $*"
+   else
+      echo "   [ Error ] $*"
+   fi
+   echo ""
+}
+
+warn (){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[33m\033[1mWarning\033[m ] $*"
+   else
+      echo "   [ Error ] $*"
+   fi
+   echo ""
+}
+
+info (){
+   if $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[32m\033[1mInfo\033[m ]  $*"
+      else
+         echo "   [ Info ]  $*"
+      fi
+      echo ""
+   fi
+}
+
+
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[85G[ \033[32mok\033[m ]"
+   fi
+}
+echo_failed(){
+   if $terminal ; then
+      echo -e "\033[85G[ \033[1;31mfailed\033[m ]"
+   fi
+}
+echo_skipped() {
+   if $terminal ; then
+      echo -e "\033[85G[ \033[33m\033[1mskipped\033[m ]"
+   fi
+}
+echo_wait(){
+   if $terminal ; then
+      echo -en "\033[85G[ \033[5m\033[1m..\033[m ]"
+   fi
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+
+detect_os () {
+
+   if $(which lsb_release > /dev/null 2>&1) ; then
+
+      DIST="$(lsb_release -i | awk '{print tolower($3)}')"
+      DIST_VERSION="$(lsb_release -r | awk '{print tolower($2)}')"
+      DIST_CODENAME="$(lsb_release -c | awk '{print tolower($2)}')"
+
+      if [[ "$DIST" = "debian" ]]; then
+         if $(echo "$DIST_VERSION" | grep -q '\.') ; then
+            DIST_VERSION=$(echo "$DIST_VERSION" | cut --delimiter='.' -f1)
+         fi
+      fi
+
+   elif [[ -e "/etc/os-release" ]]; then
+
+      . /etc/os-release
+
+      DIST=$ID
+      DIST_VERSION=${VERSION_ID}
+
+   fi
+
+   # remove whitespace from DIST and DIST_VERSION
+   DIST="${DIST// /}"
+   DIST_VERSION="${DIST_VERSION// /}"
+
+}
+
+
+
+# ----------
+# - Jobhandling
+# ----------
+
+# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
+# -
+trap clean_up SIGHUP SIGINT SIGTERM
+
+# - Create lock directory '$LOCK_DIR"
+#
+mkdir "$LOCK_DIR"
+
+
+# ----------
+# - Some checks ..
+# ----------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+   terminal=true
+else
+   fatal "Script must run in a terminal."
+fi
+
+
+# ==========
+# - Begin Main Script
+# ==========
+
+# ----------
+# - Headline
+# ----------
+
+if $terminal ; then
+   echo ""
+   echo -e "\033[1m----------\033[m"
+   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
+   echo -e "\033[1m----------\033[m"
+fi
+
+
+# ----------
+#  Read Configurations from $conf_file
+# ----------
+
+# - Give your default values here
+# -
+DEFAULT_FQHN_HOSTNAME="$(hostname -f)"
+
+DEFAULT_MATTERMOST_USER="mattermost"
+DEFAULT_MATTERMOST_GROUP="mattermost"
+
+DEFAULT_MATTERMOST_BASE_INSTALL_PATH="/opt"
+DEFAULT_MATTERMOST_TMP_DIR="/tmp"
+
+if [[ -f "$conf_file" ]]; then
+   source "$conf_file"
+else
+   fatal "No configuration file '$conf_file' present.\n
+
+             In upgrade mode a configuration file is required!"
+fi
+
+[[ -n "$FQHN_HOSTNAME" ]] && DEFAULT_FQHN_HOSTNAME="$FQHN_HOSTNAME"
+
+if [[ -z "$DB_NAME" ]] ; then
+   fatal "Missing database name (DB_NAME)!"
+fi
+if [[ -z "$DB_USER" ]] ; then
+   fatal "Missing database user (DB_USER)!"
+fi
+if [[ -z "$DB_PASS" ]] ; then
+   fatal "Missing database password (DB_PASS)!"
+fi
+
+[[ -n "$MATTERMOST_BASE_INSTALL_PATH" ]] && DEFAULT_MATTERMOST_BASE_INSTALL_PATH="$MATTERMOST_BASE_INSTALL_PATH"
+[[ -n "$MATTERMOST_TMP_DIR" ]] && DEFAULT_MATTERMOST_TMP_DIR="$MATTERMOST_TMP_DIR"
+
+[[ -n "$MATTERMOST_USER" ]] && DEFAULT_MATTERMOST_USER="$MATTERMOST_USER"
+if [[ -n "$MATTERMOST_GROUP" ]]; then
+   DEFAULT_MATTERMOST_GROUP="$MATTERMOST_GROUP"
+else
+   DEFAULT_MATTERMOST_GROUP="$DEFAULT_MATTERMOST_USER"
+fi
+
+
+echo -e "\033[32m--\033[m"
+echo ""
+echo "Version to upgrade Mattermost Server"
+echo ""
+echo "   see: https://mattermost.com/download/"
+echo ""
+echo ""
+MM_NEW_VERSION=
+while [ "X$MM_NEW_VERSION" = "X" ]
+do
+   echononl "New Mattermost Server Version: "
+   read MM_NEW_VERSION
+   if [ "X$MM_NEW_VERSION" = "X" ]; then
+      echo -e "\n\t\033[33m\033[1mA Version number is required!\033[m\n"
+   fi
+done
+DOWNLOAD_ARCHIVE="mattermost-${MM_NEW_VERSION}-linux-amd64.tar.gz"
+DOWNLOAD_URL="https://releases.mattermost.com/${MM_NEW_VERSION}/${DOWNLOAD_ARCHIVE}"
+
+
+
+echo -e "\033[32m--\033[m"
+echo ""
+echo "Base path of current mattermost installation."
+echo ""
+echo -e "   The install directory is everything before the first occurrence "
+echo -e "   of the string \e[3m/mattermost\e[0m."
+echo ""
+echo ""
+MATTERMOST_BASE_INSTALL_PATH=
+if [[ -n "$DEFAULT_MATTERMOST_BASE_INSTALL_PATH" ]]; then
+   while [[ "X${MATTERMOST_BASE_INSTALL_PATH}" = "X" ]]; do
+      echononl "Base installation path [${DEFAULT_MATTERMOST_BASE_INSTALL_PATH}]: "
+      read MATTERMOST_BASE_INSTALL_PATH
+      if [[ "X${MATTERMOST_BASE_INSTALL_PATH}" = "X" ]]; then
+         MATTERMOST_BASE_INSTALL_PATH=$DEFAULT_MATTERMOST_BASE_INSTALL_PATH
+      fi
+      if [[ ! -d "${MATTERMOST_BASE_INSTALL_PATH}/mattermost" ]]; then
+         echo -e "\n\tGiven Path does not contain a mattermost installation"
+         MATTERMOST_BASE_INSTALL_PATH=
+      fi
+   done
+else
+   while [[ "X${MATTERMOST_BASE_INSTALL_PATH}" = "X" ]]; do
+      echononl "Base installation path: "
+      read MATTERMOST_BASE_INSTALL_PATH
+      if [[ "X${MATTERMOST_BASE_INSTALL_PATH}" = "X" ]]; then
+         echo -e "\n\t\033[33m\033[1mBase installation path of current installation is reqired\033[m\n"
+      fi
+      if [[ ! -d "${MATTERMOST_BASE_INSTALL_PATH}/mattermost" ]]; then
+         echo -e "\n\tGiven Path does not contain a mattermost installation"
+         MATTERMOST_BASE_INSTALL_PATH=
+      fi
+   done
+fi
+
+MATTERMOST_CURRENT_VERSION="$(${MATTERMOST_BASE_INSTALL_PATH}/mattermost/bin/mattermost version 2> /dev/null | grep -E "^Build Number:" | cut -d' ' -f3)"
+
+
+
+echo -e "\033[32m--\033[m"
+echo ""
+echo "Give TMP directory for Downlaoding and extracting mattermost sources.."
+echo ""
+echo ""
+MATTERMOST_TMP_DIR=
+if [[ -n "$DEFAULT_MATTERMOST_TMP_DIR" ]]; then
+   while [[ "X${MATTERMOST_TMP_DIR}" = "X" ]]; do
+      echononl "TMP directory [${DEFAULT_MATTERMOST_TMP_DIR}]: "
+      read MATTERMOST_TMP_DIR
+      if [[ "X${MATTERMOST_TMP_DIR}" = "X" ]]; then
+         MATTERMOST_TMP_DIR=$DEFAULT_MATTERMOST_TMP_DIR
+      fi
+      if [[ ! -d "${MATTERMOST_TMP_DIR}" ]]; then
+         echo -e "\n\tnGiven TMP Directory \033[33m\033[1m$MATTERMOST_TMP_DIR\033[m does not exist!\n"
+         MATTERMOST_BASE_INSTALL_PATH=
+      fi
+   done
+else
+   while [[ "X${MATTERMOST_TMP_DIR}" = "X" ]]; do
+      echononl "TMP directory: "
+      read MATTERMOST_TMP_DIR
+      if [[ "X${MATTERMOST_TMP_DIR}" = "X" ]]; then
+         echo -e "\n\t\033[33m\033[1mA TMP directory is required!\033[m\n"
+         continue
+      fi
+      if [[ ! -d "${MATTERMOST_TMP_DIR}" ]]; then
+         echo -e "\n\tGiven TMP Directory \033[33m\033[1m$MATTERMOST_TMP_DIR\033[m does not exist!\n"
+         MATTERMOST_TMP_DIR=""
+      fi
+   done
+fi
+
+
+FQHN_HOSTNAME=
+echo ""
+echo -e "\033[32m--\033[m"
+echo ""
+echo "Insert full qualified hostname for Mattermost Service"
+echo ""
+if [[ -n "$DEFAULT_FQHN_HOSTNAME" ]]; then
+   while [[ "X${FQHN_HOSTNAME}" = "X" ]]; do
+      echononl "Full qualified hostname [${DEFAULT_FQHN_HOSTNAME}]: "
+      read FQHN_HOSTNAME
+      if [[ "X${FQHN_HOSTNAME}" = "X" ]]; then
+         FQHN_HOSTNAME=$DEFAULT_FQHN_HOSTNAME
+      fi
+      if [[ ! $FQHN_HOSTNAME =~ \. ]]; then
+         echo -e "\n\tGiven Host \033[33m\033[1m$FQHN_HOSTNAME\033[m seems not to be a full qualified hostname.\n"
+         FQHN_HOSTNAME=""
+      fi
+   done
+else
+   while [[ "X${FQHN_HOSTNAME}" = "X" ]]; do
+      echononl "Full qualified hostname: "
+      read FQHN_HOSTNAME
+      if [[ "X${FQHN_HOSTNAME}" = "X" ]]; then
+         echo -e "\n\t\033[33m\033[1mFull qualified hostname is reqired\033[m\n"
+      fi
+      if [[ ! $FQHN_HOSTNAME =~ \. ]]; then
+         echo -e "\n\tGiven Host \033[33m\033[1m$FQHN_HOSTNAME\033[m seems not to be a full qualified hostname.\n"
+         FQHN_HOSTNAME=""
+      fi
+   done
+fi
+HOSTNAME="${FQHN_HOSTNAME%%.*}"
+
+echo ""
+echo "--"
+echo ""
+echo "Enter user and group for Mattermost Service."
+echo ""
+MATTERMOST_USER=
+while [ "X$MATTERMOST_USER" = "X" ]
+do
+   echononl "Mattermost user [${DEFAULT_MATTERMOST_USER}]: "
+   read MATTERMOST_USER
+   if [ "X$MATTERMOST_USER" = "X" ]; then
+      MATTERMOST_USER=$DEFAULT_MATTERMOST_USER
+   fi
+done
+MATTERMOST_GROUP=
+while [ "X$MATTERMOST_GROUP" = "X" ]
+do
+   echononl "Mattermost group [$DEFAULT_MATTERMOST_GROUP]: "
+   read MATTERMOST_GROUP
+   if [ "X$MATTERMOST_GROUP" = "X" ]; then
+      MATTERMOST_GROUP=$DEFAULT_MATTERMOST_GROUP
+   fi
+done
+
+
+if [[ -n "$MYSQL_CREDENTIAL_ARGS" ]] ; then
+   if ! $(mysql $MYSQL_CREDENTIAL_ARGS -N -s -e 'quit' > /dev/null 2>&1) ; then
+      fatal "Parameter MYSQL_CREDENTIAL_ARGS is given, but a connection to MySQL Service failed.!"
+   fi
+   USE_MYSQL_CREDENTIAL_ARGS=true
+else
+   USE_MYSQL_CREDENTIAL_ARGS=false
+
+   _MYSQL_ROOT_PW=""
+   echo ""
+   echo -e "\033[32m--\033[m"
+   echo ""
+   echo "Insert root password of MySQL Database Service"
+   echo ""
+   while [ "X${_MYSQL_ROOT_PW}" = "X" ]; do
+
+      echononl "Passworteingabe: "
+      read -s _MYSQL_ROOT_PW
+      if [ "X${_MYSQL_ROOT_PW}" = "X" ]; then
+         echo -e "\n\t\033[33m\033[1mPassworteingabe erforderlich!\033[m\n"
+         continue
+      fi
+      if $(pgrep mysqld_safe > /dev/null 2>&1) || $(pgrep mysqld > /dev/null 2>&1); then
+         if $(mysql --user="root" --password="$_MYSQL_ROOT_PW"  -N -s -e 'quit' > /dev/null 2>&1) ; then
+            MYSQL_ROOT_PW=$_MYSQL_ROOT_PW
+         else
+            echo -e "\n\t\033[33m\033[1mFalsches Passwort\033[m\n"
+            _MYSQL_ROOT_PW=""
+         fi
+      else
+         fatal "MySQL seems not be running. Start MySQL Service and try installing mattermost again."
+      fi
+   done
+fi
+
+
+
+blank_line
+blank_line
+echo -e "\033[32mStart upgrade script for Mattermost Server with the following parameters\033[m"
+echo ""
+echo -e "   Mattermost current Server Version.: $MATTERMOST_CURRENT_VERSION"
+echo ""
+echo -e "   Mattermost New Server Version.....: \033[33m\033[1m$MM_NEW_VERSION\033[m"
+echo ""
+echo -e "   Full qualified Hostname...........: $FQHN_HOSTNAME"
+echo -e "   Hostname..........................: $HOSTNAME"
+echo ""
+echo -e "   Base path of installation.........: $MATTERMOST_BASE_INSTALL_PATH"
+echo ""
+echo -e "   TMP directory ....................: $MATTERMOST_TMP_DIR"
+echo ""
+echo -e "   Mattermost user...................: $MATTERMOST_USER"
+echo -e "   Mattermost group..................: $MATTERMOST_GROUP"
+echo ""
+echo ""
+if $USE_MYSQL_CREDENTIAL_ARGS ; then
+   echo -e "   MYSQL_CREDENTIAL_ARGS.............: $MYSQL_CREDENTIAL_ARGS"
+else
+   echo -e "   Root password MySQL...............: **"
+fi
+echo ""
+echo -e "   Database Name.....................: $DB_NAME"
+echo -e "   Database User.....................: $DB_USER"
+echo -e "   Database Password.................: $DB_PASS"
+echo ""
+echononl "einverstanden (yes/no): "
+read OK
+OK=${OK,,}
+while [ "X$OK" != "Xyes" -a "X$OK" != "Xno" ]; do
+   echononl "Wrong entry! [yes/no]: "
+   read OK
+   OK=${OK,,}
+done
+[ $OK = "yes" ] || fatal Repeat with other settings..
+
+
+blank_line
+blank_line
+
+if ! $USE_MYSQL_CREDENTIAL_ARGS ; then
+   MYSQL_CREDENTIAL_ARGS="--user='root' --password=$_MYSQL_ROOT_PW"
+   if ! $(mysql $MYSQL_CREDENTIAL_ARGS -N -s -e 'quit' > /dev/null 2>&1) ; then
+      fatal "Parameter MYSQL_CREDENTIAL_ARGS is given, but a connection to MySQL Service failed.!"
+   fi
+fi
+
+
+blank_line
+echo -e "\033[37m\033[1mSome pre-installation stuff..\033[m"
+blank_line
+
+echononl "Download version \033[1m${MM_NEW_VERSION}\033[m of the Mattermost Server.."
+if [[ ! -f "${working_dir}/mattermost-${MM_NEW_VERSION}-linux-amd64.tar.gz" ]]; then
+   wget -P ${working_dir} $DOWNLOAD_URL > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+
+      echononl "continue anyway [yes/no]: "
+      read OK
+      OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+      while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+         echononl "Wrong entry! - repeat [yes/no]: "
+         read OK
+      done
+      [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Extract the Mattermost Server files into TMP directory.."
+tar  -xf ${working_dir}/mattermost-${MM_NEW_VERSION}-linux-amd64.tar.gz \
+   -C ${MATTERMOST_TMP_DIR} --transform='s,^[^/]\+,\0-upgrade,'
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+else
+   echo_ok
+fi
+
+echononl "Stop Mattermost Service.."
+if $(systemctl is-active --quiet service mattermost.service) ; then
+   systemctl stop mattermost.service > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat "$log_file")"
+
+      echononl "continue anyway [yes/no]: "
+      read OK
+      OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+      while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+         echononl "Wrong entry! - repeat [yes/no]: "
+         read OK
+      done
+      [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+echononl "Backup mattermost database.."
+mysqldump --login-path=local --opt $DB_NAME \
+   > ${MATTERMOST_BASE_INSTALL_PATH}/mattermost-${backup_date}.sql 2> $log_file
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+else
+   echo_ok
+fi
+
+echononl "Backup mattermost installation directory.."
+cp -ra ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/ \
+   ${MATTERMOST_BASE_INSTALL_PATH}/mattermost-back-${backup_date}/ > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+else
+   echo_ok
+fi
+
+
+echo
+echo -e "\033[37m\033[1mUpgrade Mattermost to version $MM_NEW_VERSION ..\033[m"
+echo
+
+
+echononl "Remove all files except \e[3mspecial directories\e[0m from within the current mattermost directory."
+find ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/ ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/client/ \
+   -mindepth 1 -maxdepth 1 \! \( -type d \( -path ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/client \
+   -o -path ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/client/plugins \
+   -o -path ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/config \
+   -o -path ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/logs \
+   -o -path ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/plugins \
+   -o -path ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/data \) -prune \) | sort | sudo xargs rm -r > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+else
+   echo_ok
+fi
+
+
+echononl "Change ownership of the new files before copying them.."
+chown -hR ${MATTERMOST_USER}:${MATTERMOST_GROUP} ${MATTERMOST_TMP_DIR}/mattermost-upgrade/ > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+else
+   echo_ok
+fi
+
+
+echononl "Copy the new files to your install directory.."
+cp -an ${MATTERMOST_TMP_DIR}/mattermost-upgrade/. ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/ > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+else
+   echo_ok
+fi
+
+# Activate the CAP_NET_BIND_SERVICE capability to allow the new Mattermost binary 
+# to bind to low ports.
+#
+echononl "Allow the new Mattermost binary to bind to low ports.."
+setcap cap_net_bind_service=+ep ${MATTERMOST_BASE_INSTALL_PATH}/mattermost/bin/mattermost > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+else
+   echo_ok
+fi
+
+blank_line
+echo -e "\033[37m\033[1mSome post-installation stuff..\033[m"
+blank_line
+
+echononl "Remove the temporary files.."
+rm -r ${MATTERMOST_TMP_DIR}/mattermost-upgrade/ > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+
+   echononl "continue anyway [yes/no]: "
+   read OK
+   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+      echononl "Wrong entry! - repeat [yes/no]: "
+      read OK
+   done
+   [[ $OK = "yes" ]] || fatal "Stopped by user"
+
+else
+   echo_ok
+fi
+
+echononl "Start Mattermost Service"
+systemctl start mattermost.service > "$log_file" 2>&1
+if [[ $? -ne 0 ]]; then
+   echo_failed
+   error "$(cat "$log_file")"
+else
+   echo_ok
+fi
+
+clean_up 0
+