unsorted uniq w/ remove trailing spaces

unsorteduniq.sh

#!/usr/bin/env bash
# unsorted uniq w/ remove trailing spaces
# @version  2017.4.29.0
# @license  CC0 Univ PD https://creativecommons.org/publicdomain/zero/1.0/
# @author   noromanba

# require sponge(1) provided w/ moreutils

set -euC

for file in "$@"
do
  sed 's/\s\+$//' "$file" | awk '!x[$0]++' | sponge "$file"
done