Extend APTMAN help message

aptman

@@ -16,7 +16,6 @@ fi
 
 PREFIX=""
 target_env="$MSYSTEM"
-cmd=""
 
 if [ "$1" == "-t" ]
 then
@@ -52,8 +51,10 @@ then
             ;;
         esac
 else
-    if [ "$MSYSTEM" != "MSYS" ]
+    if [ "$MSYSTEM" == "MSYS" ]
     then
+        PREFIX=""
+    else
         PREFIX="$MINGW_PACKAGE_PREFIX""-"
     fi
 fi
@@ -135,18 +136,22 @@ case "$cmd" in
         ;;
     *)
         # else
-        echo "Usage: aptman [...]"
-        echo "---------------------------------------"
-        echo "update              - Update packages"
-        echo "upgrade             - Install upgrades" 
-        echo "upgradeable         - List upgradeable packages"
-        echo "install | reinstall - (re)Install packages"
-        echo "remove              - Uninstall package"
-        echo "autoremove          - Uninstalling orphaned packages"
-        echo "purge               - Uninstall package, dependencies and clean config"
-        echo "check               - Check for broken dependencies"
-        echo "search              - Search package"
-        echo "show                - Show package info"
-        echo "clean | cleaner     - Clean up pacman cache"
+        echo "USAGE: aptman ([OPTION]) [COMMAND]"
+        echo "-------------------------------------------------------------------------------"
+        echo "OPTIONS:"
+        echo "  -t [ENVIRONMENT]          : Use target MSYS environment" 
+        echo "-------------------------------------------------------------------------------"
+        echo "COMMANDS:"
+        echo "  update                    - Update package index"
+        echo "  upgrade                   - Install upgrades" 
+        echo "  upgradeable               - List upgradeable packages"
+        echo "  install | reinstall [PKG] - (re)Install packages"
+        echo "  remove [PKG]              - Uninstall package"
+        echo "  autoremove                - Uninstalling orphaned packages"
+        echo "  purge [PKG]               - Uninstall package, dependencies and clean config"
+        echo "  check                     - Check for broken dependencies"
+        echo "  search [PKG]              - Search package"
+        echo "  show [PKG]                - Show package info"
+        echo "  clean | cleaner           - Clean up pacman cache"
         ;;
 esac