diff --git a/shell/aliases b/shell/aliases
index b4ce092..40edef4 100755
--- a/shell/aliases
+++ b/shell/aliases
@@ -1,14 +1,15 @@
 ## .aliases
 
-case "$(uname)" in
-    "Darwin")
+case "$OSTYPE" in
+    *darwin*)
         alias top="top -o cpu -s 5"
         ;;
-    "Linux")
+    *linux*)
         alias ls="ls --color"
         ;;
 esac
 
 alias ll="ls -l"
 alias tree="tree -C"
+which colordiff 2>&1 >/dev/null && alias diff="colordiff"