diff --git a/install.sh b/install.sh
index e94d4d2..6cf0c65 100755
--- a/install.sh
+++ b/install.sh
@@ -258,21 +258,14 @@ uninstall(){
 
 BIN=install
 ARG=""
-while [[ $# > 0 || -n "$ARG" ]]; do
-    if [[ -z "$ARG" ]]; then ARG=$1 ORIGIN_ARG=$1; shift; fi
+for i in ${ARG_PARSED[@]}; do
     case $ARG in
-        -i* ) BIN=install ;;
-        -r* ) BIN=uninstall ;;
-        -q*|--quite ) export DFS_QUIET=1 ;;
-        -d*|--dev ) export DFS_DEV=1 ;;
-        -l*|--lite ) export DFS_LITE=1 ;;
-        -a*|--auto ) install_dependencies ;;
-        *  ) fmt_warning "unknown command \"$ORIGIN_ARG\". available: -i, -r, -q, -d, -l, -a"; exit 1 ;;
+        -i ) BIN=install ;;
+        -r ) BIN=uninstall ;;
+        -d|--dev ) export DFS_DEV=1 ;;
+        -l|--lite ) export DFS_LITE=1 ;;
+        -a|--auto ) install_dependencies ;;
+        * ) fmt_warning "unknown command \"$ORIGIN_ARG\". available: -i, -r, -q, -d, -l, -a"; exit 1 ;;
     esac
-    if [[ "$ARG" == "--"* || ${#ARG} == 2 ]]; then
-        ARG=""
-    else
-        ARG=-${ARG:2}
-    fi
 done
 $BIN
diff --git a/tools/common.sh b/tools/common.sh
index 525d878..ef277fc 100755
--- a/tools/common.sh
+++ b/tools/common.sh
@@ -2,11 +2,7 @@
 
 THIS_DIR_COMMON_SH=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
 export DOTFILES=$( cd "$THIS_DIR_COMMON_SH/.." && pwd )
-
-SUDO=''
-if [[ "$EUID" != "0" && -x $(command -v sudo) ]]; then
-    SUDO='sudo'
-fi
+if [[ -f ~/.config/dotfiles/env ]]; then source ~/.config/dotfiles/env; fi
 
 # Color settings
 # Source: https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh
@@ -101,6 +97,31 @@ setup_color() {
 }
 # END of color settings
 
+SUDO=''
+if [[ "$EUID" != "0" && -x $(command -v sudo) ]]; then
+    SUDO='sudo'
+fi
+
+# arg parse
+ARG=""
+ARG_PARSED=()
+while [[ $# > 0 || -n "$ARG" ]]; do
+    if [[ -z "$ARG" ]]; then ARG=$1 ORIGIN_ARG=$1; shift; fi
+    case $ARG in
+        -q*|--quite ) export DFS_QUIET=1 ;;
+        --* ) ARG_PARSED+=("$ARG") ;;
+        -* ) ARG_PARSED+=("${ARG:0:2}") ;;
+        *  ) fmt_fatal "error parsing argument \"$ORIGIN_ARG\"" ;;
+    esac
+    if [[ "$ARG" == "--"* || ${#ARG} == 2 ]]; then
+        ARG=""
+    else
+        ARG=-${ARG:2}
+    fi
+done
+unset ARG
+
+
 ask_for_yN()
 {
     while [[ -z "$DFS_QUIET" || "$DFS_QUIET" == "0" ]]; do