% test, playground

# this should be the first test. single and double quotes + newlines
echo <x> <y>

# variable names
echo <x> <foo> <foo_bar> <lorem-ipsum> <dolor sit>

# use %
coll::new 1 2 3 | xargs -I% echo "hello %"

# return a constant number
echo 42

$ x: echo -e '2\n3\n4'
$ y: echo -e "$((x+10))\n$((x+20))"