diff --git a/chopin.sh b/chopin.sh
index 5cf5508..944b28b 100755
--- a/chopin.sh
+++ b/chopin.sh
@@ -1,29 +1,30 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 name="Application"
-EXCLUDE_FILES="webxdc.js LICENSE README README.md *.sh *.xdc *~"
+EXCLUDE_PATHS="webxdc.js LICENSE README README.md *.sh *.xdc *~"
 
-function usage () {
-    echo "Usage: ${0} [-hgp]"
-    echo "  -h   Display this message"
-    echo "  -f   Lint and format all source files"
-    echo "  -g   Add pre-commit hook which formats and lints code"
-    echo "  -p   Optimize all files and pack the project as a WebXDC"
+function usage() {
+    echo "Usage: ${0} [-hfgp] [-e PATH]"
+    echo "  -h          Display this message"
+    echo "  -e [PATH]   Filename or folder to exclude from package. For several"
+    echo "              files or folders, use this flag several times with one argument."
+    echo "  -f          Lint and format all source files"
+    echo "  -g          Add pre-commit hook which formats and lints code"
+    echo "  -p          Optimize all files and pack the project as a WebXDC"
     exit 0
 }
 
-function add_pre_commit_hook () {
+function add_pre_commit_hook() {
     echo "Not implemented."
     :
 }
 
-function lint_and_format () {
+function lint_and_format() {
     if [[ -x "$(command -v rslint)" ]]; then
 	echo "Linting JavaScript source files."
 	find . -iname "*.js" -exec rslint -f {} \;
     else
 	echo "rslint not found. Cannot lint source."
-	return -1
     fi
 
     if [[ -x "$(command -v js-beautify)" ]]; then
@@ -31,29 +32,27 @@ function lint_and_format () {
 	find . -iname "*.js" -exec js-beautify -r {} \;
     else
 	echo "js-beautify not found. Cannot format source."
-	return -1
     fi
-
 }
 
 # $1 - filename
-function extract_toml () {
+function extract_toml() {
     while IFS='= ' read -r lhs rhs; do
 	if [[ ! $lhs =~ ^\ *# && -n $lhs ]]; then
-            rhs="${rhs%%\#*}"
-            rhs="${rhs%%*( )}"
-            rhs="${rhs%\"*}"
-            rhs="${rhs#\"*}"
-            declare -g $lhs="$rhs"
+	    rhs="${rhs%%\#*}"
+	    rhs="${rhs%%*( )}"
+	    rhs="${rhs%\"*}"
+	    rhs="${rhs#\"*}"
+	    declare -g $lhs="$rhs"
 	fi
-    done < $1
+    done <$1
 }
 
-function webxdc_create () {
+function webxdc_create() {
     [[ ! -f ./index.html ]] && echo "Webxdc requires it's apps to have AT LEAST an index.html. Aborting." && exit -1
 
     mkdir temp
-    
+
     if [[ -x "$(command -v minify)" ]]; then
 	echo "Minifying all source files."
 	cp --parents -r *.html *.css *.js temp/
@@ -77,7 +76,7 @@ function webxdc_create () {
     else
 	echo "optipng not found. Not optimizing any PNG files."
     fi
-    
+
     echo "Removing all existing xdc packages."
     rm -f *.xdc
 
@@ -90,24 +89,27 @@ function webxdc_create () {
 
     if [[ -x "$(command -v zip)" ]]; then
 	echo "Packing project into an xdc package."
-	zip -9 --recurse-paths "${name}.xdc" --exclude $EXCLUDE_FILES -- * > /dev/null
+	zip -9 --recurse-paths "${name}.xdc" --exclude $EXCLUDE_PATHS -- * >/dev/null
 	echo "Output: ${name}.xdc."
-	mv temp/* .
-	rmdir temp
+	mv temp/* . 2>/dev/null
+	rmdir temp/
     else
 	echo "The program zip could not be found. It is required to pack Webxdc applications. Aborting."
+	mv temp/* . 2>/dev/null
+	rmdir temp/
 	exit -1
-	mv temp/* .
-	rmdir temp
     fi
 }
 
 [[ "$#" -eq 0 ]] && usage
-while getopts ":hgpf" option; do
+while getopts ":h:egpf" option; do
     case ${option} in
 	h)
 	    usage
 	    ;;
+	e)
+	    EXCLUDE_PATHS+=" ${OPTARG}"
+	    ;;
 	f)
 	    lint_and_format
 	    ;;