message: Revise update script
diff: @@ -131,7 +131,7 @@ update()
  for file in $@
  do
  base=`basename $file`
  - if ! test -f $base || ! diff -q $file $base
  + if ! test -f $base || ! diff -q $file $base > /dev/null
  then
  cp $file $base
  fi
  