Use DIR variable to store dotfile directory

Remove hardcoded command from .bashrc

.bashrc

@@ -8,12 +8,16 @@ case $- in
       *) return;;
 esac
 
+DIR="$(dirname $(readlink -f ~/.bashrc))"
+
 # load all dotfiles in dotfiles repository
-for DOTFILE in `find $(dirname $(readlink -f ~/.bashrc))/system/.{prompt,functions,alias,path,env}.sh`
+for DOTFILE in `find $DIR/system/.{prompt,functions,alias,path,env}.sh`
 do
     [ -f "$DOTFILE" ] && source "$DOTFILE"
 done
 
+unset DIR
+
 # Source global definitions
 if [ -f /etc/bashrc ]; then
     source /etc/bashrc