I love pipes, redirects and named fds... in ZSH!

fun.zsh

#!/usr/bin/zsh
set -e
# TAB indented file!

### PREPARATION ###
# mkdir test
# cd test
# wget -q https://gist.github.com/andras-tim/f8aebf9243cecf3719d27d020a718ef8/raw/fun.zsh -O - | zsh


### MAGIC CODE ###
# Challenge: Let's explain this section in a comment! ;)
echo 2 >a
exec {b}< <(echo 3)

echo 1 | cat - <a <&${b} <<-EOF <<<5 2>&1 >c >|d >>e
	4
EOF


### (: WTF :) ###
cat c  # == cat d == cat e
#1
#2
#3
#4
#5

ls
# a c d e


### CLEANUP ###
rm a c d e
exec {b}>&-

If you run this script in bash, the magic cat will get the last input and the last output redirection only... 😜