@@ -97,6 +97,17 @@ function fgfs () {

         done

         export LD_LIBRARY_PATH

     }

+    function check_fgaddon () {

+        if ! test -r $FGADDON/fgaddon.db; then

+            echo "aircraft DB not found at $FGADDON/fgaddon.db"

+            echo "please run $0 --update-fgaddon"

+            return 1

+        fi

+        if ! command -v sqlite3 > /dev/null; then

+            which sqlite3

+            return 1

+        fi

+    }

     local aircrafts="$FGADDON/Aircraft"

     local fgfs_args=("--fg-root=$FGDIR/source/fgdata")

     local aircraft=

@@ -268,6 +279,7 @@ function fgfs () {

                     return

                     ;;

                 --info)

+                    check_fgaddon || return 1

                     local IFS=$'\n'

                     function _info () {

                         local _info=$(sqlite3 $FGADDON/fgaddon.db <<< "select \`$1\`

@@ -322,6 +334,7 @@ function fgfs () {

                     return

                     ;;

                 --show-thumbnail)

+                    check_fgaddon || return 1

                     local PS3='which aircraft ? '

                     local IFS=$'\n'

                     local ac_list=($(sqlite3 $FGADDON/fgaddon.db <<< "select distinct printf('%s [%s, %s]',

@@ -366,7 +379,7 @@ function fgfs () {

                     return

                     ;;

                 --search)

-                    command -v sqlite3 > /dev/null || return

+                    check_fgaddon || return 1

                     sqlite3 $FGADDON/fgaddon.db <<< "select printf('[%s, %s] %s (%s): %s ',

                                                                    hangars.name,

                                                                    date(aircrafts.date, 'unixepoch'),

@@ -439,6 +452,7 @@ function fgfs () {

                     return

                     ;;

                 --install)

+                    check_fgaddon || return 1

                     local PS3='which aircraft ? '

                     local IFS=$'\n'

                     select ac in $(sqlite3 $FGADDON/fgaddon.db <<< "select distinct printf('%s [%s, %s]',