update script

add echo help if no package is set to install or remove

u8-pacman

@@ -25,9 +25,9 @@ cat <<EOF
 Usage: $(basename $0) [options]
 Options:
   -h               show this help page
-  -i $PACKAGENAME   install package
+  -i PACKAGENAME   install package
   -l               list installed packages
-  -r $PACKAGENAME   remove packagename 
+  -r PACKAGENAME   remove packagename
   -u               update all installed packages
 
 EOF
@@ -85,11 +85,13 @@ function list() {
 
 if [[ "$source" == "install" ]]; then
     if [ -z "$PACKAGE" ]; then
+        echo "see -h for usage"
         exit 1
     fi
     install $PACKAGE
 elif [[ "$source" == "remove" ]]; then
     if [ -z "$PACKAGE" ]; then
+        echo "see -h for usage"
         exit 1
     fi
     remove $PACKAGE
@@ -100,4 +102,6 @@ elif [[ "$source" == "list" ]]; then
     list
 elif [[ "$source" == "update" ]]; then
     update
+elif [[ -z "$source" ]]; then
+    echo "see -h for usage"
 fi