Code cleanup, thx to http://www.shellcheck.net

sup

@@ -4,18 +4,20 @@
 # About:
 # A simple upload script for ZFH (http://zerofiles.org)
 
+_self="${0##*/}"
+
 cfg_url_regex='^[A-Za-z]([A-Za-z0-9+.-]+)?://.+'
 cfg_tmp_dir="/tmp/$USER/sup"; TEMPDIR="$cfg_tmp_dir"
 cfg_script_url='https://zfh.so/upload'
 cfg_screenshot_ext='png'
 
-[[ -f $HOME/.suprc ]] && { source $HOME/.suprc; }
+[[ -f $HOME/.suprc ]] && { source "$HOME/.suprc"; }
 
 sup.msg() { echo "[sup] $1"; }
 sup.err() { sup.msg "(error) $1" >&2; }
 
 sup.usage() {
-	echo "Usage: `basename $0` [-RsF] [-D num] [file/url]"
+	echo "Usage: ${_self} [-RsF] [-D num] [file/url]"
 }
 
 sup.env() {
@@ -49,7 +51,7 @@ sup.mktemp() {
 sup.scrot() {
 	local tmp_file
 
-	[[ "$scrot_exec" ]] || { scrot_exec=`type -P scrot`; }
+	[[ "$scrot_exec" ]] || { scrot_exec=$(type -P scrot); }
 	[[ "$scrot_exec" ]] || {
 		sup.err "Please install scrot to use this function"
 		return 1
@@ -98,15 +100,15 @@ sup.getopt() {
 			--*) echo "$i";;
 
 			-*)
-				keys=( `echo "${i##*-}" | fold -w1` )
+				keys=( $(echo "${i##*-}" | fold -w1) )
 
-				[[ "${#keys[@]}" -gt 1 ]] && {
-					for k in ${keys[@]}; do
+				if [[ "${#keys[@]}" -gt 1 ]]; then
+					for k in "${keys[@]}"; do
 						echo "-${k}"
 					done
-				} || {
+				else
 					echo "$i"
-				}
+				fi
 			;;
 
 			*) echo "$i";;
@@ -143,7 +145,7 @@ main() {
 		target="${args[0]}"; [[ "$target" ]] || { sup.usage; exit 1; }
 
 		if sup.if_url "$target"; then
-			file=`sup.mktemp "$cfg_tmp_dir"`
+			file=$(sup.mktemp "$cfg_tmp_dir")
 
 			curl -skL "$target" > "$file" || {
 				sup.err "Could not download file."