diff --git a/.zshrc2 b/.zshrc2
index 1f4fd0e..1102624 100644
--- a/.zshrc2
+++ b/.zshrc2
@@ -58,4 +58,19 @@ antigen bundle https://gitee.com/dictxiong/zsh-autosuggestions
 antigen theme ys
 # apply 
 antigen apply
-# end of antigen config
\ No newline at end of file
+# end of antigen config
+
+# functions
+export DOTFILES=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
+dfs()
+{
+	if [[ $1 == update ]]; then
+		(cd "$DOTFILES" && env git pull)
+	else
+		echo "unknown command \"$1\". available: update"
+	fi
+}
+
+# alias
+alias "pls"='sudo $(fc -ln -1)'
+alias "se"='sudo -sE'
\ No newline at end of file
diff --git a/install.sh b/install.sh
index 2161283..0ab7688 100755
--- a/install.sh
+++ b/install.sh
@@ -89,7 +89,7 @@ setup_color() {
 }
 # END of color settings
 
-dotfile_path=$(cd $(dirname $0); pwd)
+dotfile_path=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
 home_slashes=${HOME//\//\\\/}
 if [[ ! $dotfile_path == ${home_slashes}* ]]; then 
     fmt_fatal "\"$dotfile_path\" is not under \"$HOME\". aborting ..."