diff --git a/sup b/sup
index 32771dc..d29b4c7 100755
--- a/sup
+++ b/sup
@@ -13,11 +13,11 @@ cfg_screenshot_ext='png'
 
 [[ -f $HOME/.suprc ]] && { source "$HOME/.suprc"; }
 
-sup.msg() { echo "[sup] $1"; }
+sup.msg() { printf '%s\n' "[sup] $1"; }
 sup.err() { sup.msg "(error) $1" >&2; }
 
 sup.usage() {
-	echo "Usage: ${_self} [-RsF] [-D num] [file/url]"
+	printf '%s\n' "Usage: ${_self} [-RsF] [-D num] [file/url]"
 }
 
 sup.env() {
@@ -34,7 +34,7 @@ sup.upload() {
 		-F submit="" \
 		"$cfg_script_url" -sL -A 'zerofiles.org upload script' || { return 1; }
 
-	[[ "$flag_rm" ]] && { rm "$file"; }
+	(( "$flag_rm" )) && { rm "$file"; }
 
 	return 0
 }
@@ -45,11 +45,11 @@ sup.mktemp() {
 		return 1
 	}
 
-	echo "$1"
+	printf '%s\n' "$1"
 }
 
 sup.scrot() {
-	local tmp_file
+	declare tmp_file
 
 	[[ "$scrot_exec" ]] || { scrot_exec=$(type -P scrot); }
 	[[ "$scrot_exec" ]] || {
@@ -57,7 +57,7 @@ sup.scrot() {
 		return 1
 	}
 
-	[[ "$flag_scrot_fullscreen" ]] || { scrot_args+=( '-s' ); }
+	(( "$flag_scrot_fullscreen" )) || { scrot_args+=( '-s' ); }
 	[[ "$cfg_scrot_delay" ]] && { scrot_args+=( "-d $cfg_scrot_delay" ); }
 
 	tmp_file="$(sup.mktemp "${cfg_tmp_dir}" ".${cfg_screenshot_ext}")"
@@ -67,18 +67,13 @@ sup.scrot() {
 		return 1
 	}
 
-	echo "$tmp_file"
+	printf '%s\n' "$tmp_file"
 }
 
-sup.exclude() {
-	[[ "$2" ]] && { echo "$1"; return 1; }
-	return 0
-}
-
-sup.if_url() { echo "$1" | grep -oE "$cfg_url_regex" &>/dev/null; }
+sup.if_url() { printf '%s\n' "$1" | grep -oE "$cfg_url_regex" &>/dev/null; }
 
 sup.mktemp() {
-	local tmp_file_name tmp_file_name_extra="$2" tmp_dir="$1" 
+	declare tmp_file_name tmp_file_name_extra="$2" tmp_dir="$1" 
 
 	[[ -d "$tmp_dir" ]] || {
 		sup.err "${tmp_dir} does not exist or is not a directory."
@@ -89,7 +84,7 @@ sup.mktemp() {
 		tmp_file_name="${RANDOM}${RANDOM}${tmp_file_name_extra}"
 	done
 
-	echo "${tmp_dir}/${tmp_file_name}"
+	printf '%s\n' "${tmp_dir}/${tmp_file_name}"
 }
 
 sup.set_argv() {
@@ -128,7 +123,7 @@ sup.set_argv() {
 }
 
 main() {
-	local args file target flag_private flag_rm flag_scrot flag_scrot_fullscreen cfg_scrot_delay
+	declare args file target flag_private flag_rm flag_scrot flag_scrot_fullscreen cfg_scrot_delay
 
 	while [[ "$1" ]]; do
 		case "$1" in
@@ -141,19 +136,24 @@ main() {
 			
 			-h|--help|--usage) sup.usage; return;;
 
-			--) break;;
+			--) shift; break;;
 
-			*) args+=( "$1" );;
+			*) break;;
 		esac
 		shift
 	done
 
 	sup.env
 
-	if [[ "$flag_scrot" ]]; then
-		file="$(sup.scrot)" || { return 1; }
+	if (( flag_scrot )); then
+		file=$(sup.scrot) || { return 1; }
 	else
-		target="${args[0]}"; [[ "$target" ]] || { sup.usage; exit 1; }
+		(( $# )) || {
+			sup.usage
+			return 1
+		}
+
+		target="$1"
 
 		if sup.if_url "$target"; then
 			file=$(sup.mktemp "$cfg_tmp_dir")