diff --git a/.bashrc b/.bashrc
index de3419b..1ac9d54 100644
--- a/.bashrc
+++ b/.bashrc
@@ -3,12 +3,6 @@
 # if not running interactively, don't do anything
 [ -z "$PS1" ] && return
 
-# history
-export HISTCONTROL=ignoredups:erasedups
-export HISTSIZE=-1
-export HISTFILESIZE=-1
-PROMPT_COMMAND="history -a;history -n;$PROMPT_COMMAND"
-
 # title
 PS1="\[\e]0;\u@\h:\w\a\]$PS1"
 
@@ -34,6 +28,7 @@ bind "set visible-stats on"
 # alias
 alias q="exit"
 alias e='${EDITOR:-vi}'
+alias diff="diff --color=auto"
 alias grep="grep --color=auto"
 alias ls="ls --color=auto"
 alias ll="ls -AF1"