save works

src/tools/appimage/entry.sh

@@ -1,16 +1,14 @@
 #!/usr/bin/env bash
 
-APP="$0"
-
 usage() {
     local _f
 
-    _f=$(dirname "$APP")/share/xce.md
+    _f=$(dirname "$(which xce_controller)")/../share/docs/xce.md
 
     if [ ! -f "$_f" ]; then
         echo no document found
     else
-        glow -p ${_f}
+        glow -p "${_f}"
     fi
 }
 
@@ -20,6 +18,11 @@ if [ "${debug}" = "yes" ]; then
     set -x
 fi
     
+if [ $# -lt 1 ]; then
+    usage
+    exit 1
+fi
+
 case "$1" in
   controller)
     shift