diff --git a/utils/filtron.sh b/utils/filtron.sh
index 8283c966..2aa8cf4f 100755
--- a/utils/filtron.sh
+++ b/utils/filtron.sh
@@ -109,7 +109,7 @@ main() {
 
         shell)
             sudo_or_exit
-            interactive_shell
+            interactive_shell "${SERVICE_USER}"
             ;;
         inspect)
             case $2 in
@@ -136,19 +136,19 @@ main() {
             sudo_or_exit
             case $2 in
                 all) remove_all;;
-                user) remove_user ;;
+                user) drop_service_account "${SERVICE_USER}" ;;
                 *) usage "$_usage"; exit 42;;
             esac ;;
         activate)
             sudo_or_exit
             case $2 in
-                service)  activate_service ;;
+                service)  systemd_activate_service "${SERVICE_NAME}" ;;
                 *) usage "$_usage"; exit 42;;
             esac ;;
         deactivate)
             sudo_or_exit
             case $2 in
-                service)  deactivate_service ;;
+                service)  systemd_deactivate_service "${SERVICE_NAME}" ;;
                 *) usage "$_usage"; exit 42;;
             esac ;;
         apache)
@@ -174,11 +174,11 @@ install_all() {
     rst_title "Install $SERVICE_NAME (service)"
     assert_user
     wait_key
-    install_go
+    install_go "${GO_PKG_URL}" "${GO_TAR}" "${SERVICE_USER}"
     wait_key
     install_filtron
     wait_key
-    install_service
+    systemd_install_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
     wait_key
     echo
     if ! service_is_available "http://${FILTRON_LISTEN}" ; then
@@ -203,56 +203,15 @@ remove_all() {
 It goes without saying that this script can only be used to remove
 installations that were installed with this script."
 
-    remove_service
+    systemd_remove_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
     wait_key
-    remove_user
+    drop_service_account "${SERVICE_USER}"
     rm -r "$FILTRON_ETC" 2>&1 | prefix_stdout
     if service_is_available "${PUBLIC_URL}"; then
         MSG="** Don't forget to remove your public site! (${PUBLIC_URL}) **" wait_key 10
     fi
 }
 
-install_service() {
-    rst_title "Install System-D Unit ${SERVICE_NAME}.service" section
-    echo
-    install_template "${SERVICE_SYSTEMD_UNIT}" root root 644
-    wait_key
-    activate_service
-}
-
-remove_service() {
-    if ! ask_yn "Do you really want to deinstall $SERVICE_NAME?"; then
-        return
-    fi
-    deactivate_service
-    rm "${SERVICE_SYSTEMD_UNIT}"  2>&1 | prefix_stdout
-}
-
-activate_service() {
-    rst_title "Activate $SERVICE_NAME (service)" section
-    echo
-    tee_stderr <<EOF | bash 2>&1
-systemctl enable $SERVICE_NAME.service
-systemctl restart $SERVICE_NAME.service
-EOF
-    tee_stderr <<EOF | bash 2>&1
-systemctl status --no-pager $SERVICE_NAME.service
-EOF
-}
-
-deactivate_service() {
-    rst_title "De-Activate $SERVICE_NAME (service)" section
-    echo
-    tee_stderr <<EOF | bash 2>&1 | prefix_stdout
-systemctl stop $SERVICE_NAME.service
-systemctl disable $SERVICE_NAME.service
-EOF
-}
-
-user_is_available() {
-    sudo -i -u "$SERVICE_USER" echo \$HOME &>/dev/null
-}
-
 assert_user() {
     rst_title "user $SERVICE_USER" section
     echo
@@ -277,44 +236,6 @@ grep -qFs -- 'source $GO_ENV' ~/.profile || echo 'source $GO_ENV' >> ~/.profile
 EOF
 }
 
-remove_user() {
-    rst_title "Drop $SERVICE_USER HOME" section
-    if ask_yn "Do you really want to drop $SERVICE_USER home folder?"; then
-        userdel -r -f "$SERVICE_USER" 2>&1 | prefix_stdout
-    else
-        rst_para "Leave HOME folder $(du -sh "$SERVICE_HOME") unchanged."
-    fi
-}
-
-interactive_shell(){
-    echo "// exit with ${_BCyan}CTRL-D${_creset}"
-    sudo -H -u ${SERVICE_USER} -i
-}
-
-_service_prefix="  |$SERVICE_USER| "
-
-go_is_available() {
-    sudo -i -u "$SERVICE_USER" which go &>/dev/null
-}
-
-install_go() {
-    rst_title "Install Go in user's HOME" section
-
-    rst_para "download and install go binary .."
-    cache_download "${GO_PKG_URL}" "${GO_TAR}"
-
-    tee_stderr 0.1 <<EOF | sudo -i -u "$SERVICE_USER" | prefix_stdout "$_service_prefix"
-echo \$PATH
-echo \$GOPATH
-mkdir -p \$HOME/local
-rm -rf \$HOME/local/go
-tar -C \$HOME/local -xzf ${CACHE}/${GO_TAR}
-EOF
-    sudo -i -u "$SERVICE_USER" <<EOF | prefix_stdout
-! which go >/dev/null &&  echo "ERROR - Go Installation not found in PATH!?!"
-which go >/dev/null &&  go version && echo "congratulations -- Go installation OK :)"
-EOF
-}
 
 filtron_is_installed() {
     [[ -f $SERVICE_HOME/go-apps/bin/filtron ]]
@@ -356,12 +277,12 @@ EOF
 
     apache_is_installed && info_msg "Apache is installed."
 
-    if user_is_available; then
+    if service_account_is_available "$SERVICE_USER"; then
         info_msg "service account $SERVICE_USER available."
     else
         err_msg "service account $SERVICE_USER not available!"
     fi
-    if go_is_available; then
+    if go_is_available "$SERVICE_USER"; then
         info_msg "~$SERVICE_USER: go is installed"
     else
         err_msg "~$SERVICE_USER: go is not installed"
diff --git a/utils/lib.sh b/utils/lib.sh
index 91335fbb..4a77671a 100755
--- a/utils/lib.sh
+++ b/utils/lib.sh
@@ -25,10 +25,6 @@ if [[ -z "$CACHE" ]]; then
     CACHE="${REPO_ROOT}/cache"
 fi
 
-if [[ -z "$SYSTEMD_UNITS" ]]; then
-    SYSTEMD_UNITS="/lib/systemd/system"
-fi
-
 if [[ -z ${DIFF_CMD} ]]; then
     DIFF_CMD="diff -u"
     if command -v colordiff >/dev/null;  then
@@ -477,6 +473,125 @@ service_is_available() {
     return "$exit_val"
 }
 
+# golang
+# ------
+
+go_is_available() {
+
+    # usage:  go_is_available $SERVICE_USER && echo "go is installed!"
+
+    sudo -i -u "${1}" which go &>/dev/null
+}
+
+install_go() {
+
+    # usage:  install_go "${GO_PKG_URL}" "${GO_TAR}" "${SERVICE_USER}"
+
+    local _service_prefix="  |${3}| "
+
+    rst_title "Install Go in user's HOME" section
+
+    rst_para "download and install go binary .."
+    cache_download "${1}" "${2}"
+
+    tee_stderr 0.1 <<EOF | sudo -i -u "${3}" | prefix_stdout "$_service_prefix"
+echo \$PATH
+echo \$GOPATH
+mkdir -p \$HOME/local
+rm -rf \$HOME/local/go
+tar -C \$HOME/local -xzf ${CACHE}/${2}
+EOF
+    sudo -i -u "${3}" <<EOF | prefix_stdout
+! which go >/dev/null &&  echo "ERROR - Go Installation not found in PATH!?!"
+which go >/dev/null &&  go version && echo "congratulations -- Go installation OK :)"
+EOF
+}
+
+# system accounts
+# ---------------
+
+service_account_is_available() {
+
+    # usage:  service_account_is_available "$SERVICE_USER" && echo "OK"
+
+    sudo -i -u "$1" echo \$HOME &>/dev/null
+}
+
+drop_service_account() {
+
+    # usage:  drop_service_account "${SERVICE_USER}"
+
+    rst_title "Drop ${1} HOME" section
+    if ask_yn "Do you really want to drop ${1} home folder?"; then
+        userdel -r -f "${1}" 2>&1 | prefix_stdout
+    else
+        rst_para "Leave HOME folder $(du -sh "${1}") unchanged."
+    fi
+}
+
+interactive_shell(){
+
+    # usage:  interactive_shell "${SERVICE_USER}"
+
+    echo "// exit with ${_BCyan}CTRL-D${_creset}"
+    sudo -H -u "${1}" -i
+}
+
+
+# systemd
+# -------
+
+SYSTEMD_UNITS="${SYSTEMD_UNITS:-/lib/systemd/system}"
+
+systemd_install_service() {
+
+    # usage:  systemd_install_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
+
+    rst_title "Install System-D Unit ${1}" section
+    echo
+    install_template "${2}" root root 644
+    wait_key
+    systemd_activate_service "${1}"
+}
+
+systemd_remove_service() {
+
+    # usage:  systemd_remove_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
+
+    if ! ask_yn "Do you really want to deinstall ${1}?"; then
+        return
+    fi
+    systemd_deactivate_service "${1}"
+    rm "${2}"  2>&1 | prefix_stdout
+}
+
+systemd_activate_service() {
+
+    # usage:  systemd_activate_service "${SERVICE_NAME}"w
+
+    rst_title "Activate ${1} (service)" section
+    echo
+    tee_stderr <<EOF | bash 2>&1
+systemctl enable  ${1}.service
+systemctl restart ${1}.service
+EOF
+    tee_stderr <<EOF | bash 2>&1
+systemctl status --no-pager ${1}.service
+EOF
+}
+
+systemd_deactivate_service() {
+
+    # usage:  systemd_deactivate_service "${SERVICE_NAME}"
+
+    rst_title "De-Activate ${1} (service)" section
+    echo
+    tee_stderr <<EOF | bash 2>&1 | prefix_stdout
+systemctl stop    ${1}.service
+systemctl disable ${1}.service
+EOF
+}
+
 
 # Apache
 # ------
diff --git a/utils/searx.sh b/utils/searx.sh
index ad8515d4..47aad286 100755
--- a/utils/searx.sh
+++ b/utils/searx.sh
@@ -124,7 +124,7 @@ main() {
 
         shell)
             sudo_or_exit
-            interactive_shell
+            interactive_shell "${SERVICE_USER}"
             ;;
         inspect)
             case $2 in
@@ -153,7 +153,7 @@ main() {
             sudo_or_exit
             case $2 in
                 all) remove_all;;
-                user) remove_user ;;
+                user) drop_service_account "${SERVICE_USER}";;
                 pyenv) remove_pyenv ;;
                 searx-src) remove_searx ;;
                 *) usage "$_usage"; exit 42;;
@@ -250,7 +250,7 @@ cp -f ${SEARX_SETTINGS}.backup ${SEARX_SETTINGS}
 EOF
             ;;
         "start interactiv shell")
-            interactive_shell
+            interactive_shell "${SERVICE_USER}"
             ;;
     esac
     chown "${SERVICE_USER}:${SERVICE_USER}" "${SEARX_SETTINGS}"
@@ -275,16 +275,12 @@ installations that were installed with this script."
     fi
     remove_searx_uwsgi
     wait_key
-    remove_user
+    drop_service_account "${SERVICE_USER}"
     if service_is_available "${PUBLIC_URL}"; then
         MSG="** Don't forgett to remove your public site! (${PUBLIC_URL}) **" wait_key 10
     fi
 }
 
-user_is_available() {
-    sudo -i -u "$SERVICE_USER" echo \$HOME &>/dev/null
-}
-
 assert_user() {
     rst_title "user $SERVICE_USER" section
     echo
@@ -299,15 +295,6 @@ EOF
     #echo "export SERVICE_HOME=$SERVICE_HOME"
 }
 
-remove_user() {
-    rst_title "Drop $SERVICE_USER HOME" section
-    if ask_yn "Do you really want to drop $SERVICE_USER home folder?"; then
-        userdel -r -f "$SERVICE_USER" 2>&1 | prefix_stdout
-    else
-        rst_para "Leave HOME folder $(du -sh "$SERVICE_HOME") unchanged."
-    fi
-}
-
 clone_is_available() {
     [[ -f "$SEARX_SETTINGS" ]]
 }
@@ -445,11 +432,6 @@ deactivate_service() {
     uWSGI_restart
 }
 
-interactive_shell(){
-    echo "// exit with ${_BCyan}CTRL-D${_creset}"
-    sudo -H -u ${SERVICE_USER} -i
-}
-
 git_diff() {
     sudo -H -u "${SERVICE_USER}" -i <<EOF
 cd ${SEARX_REPO_FOLDER}
@@ -491,7 +473,7 @@ EOF
 
     apache_is_installed && info_msg "Apache is installed."
 
-    if user_is_available; then
+    if service_account_is_available "$SERVICE_USER"; then
         info_msg "Service account $SERVICE_USER exists."
     else
         err_msg "Service account $SERVICE_USER does not exists!"