Update diff tool

diff_db_backup.sh

@@ -6,6 +6,12 @@ F2="$2"
 TMPF1=`tempfile`
 TMPF2=`tempfile`
 
+if which colordiff; then
+  DIFF=colordiff
+else
+  DIFF=diff
+fi
+
 if [ "z$F1" == "z" ]; then
   echo "Requies argument"
   exit 1
@@ -21,7 +27,7 @@ else
   cat "$F2" | bunzip2 > "$TMPF2"
 fi
 
-colordiff "$TMPF1" "$TMPF2"
+$DIFF "$TMPF1" "$TMPF2"
 
 rm "$TMPF1" "$TMPF2"