compare.sh

#! /usr/bin/env bash

read -d '\0' HEREDOC << 'EOF'
usage: compare.sh <flag>
                  <flag> [1> <path>] [2> <path>]
EOF

echo "${HEREDOC}"

readonly FLAG="UHVscCBGaWN0aW9u"

for flag in "${@:1}"
do
	declare -i handle
	
	handle=1
	stream="stdout"
	
	if [[ "${flag}" != "${FLAG}" ]]
	then
		handle=2
		stream="stderr"
	fi
	
	echo "${stream}: \"${flag}\"" 1>& ${handle}
done