Operations with sets

cart-prod.sh

#!/bin/zsh
join -1 2 -2 2 <(echo ${${1//,/\\n}//({|})/}) <(echo ${${2//,/\\n}//({|})/})|gsed 's/^ /(/;s/ /,/;s/$/)/;s/\n/,/'|gsed -z 's/\n/,/g;s/^/{/;s/,$/}\n/'

power-set.sh

#!/bin/zsh
S=$(eval echo\ "\{\,-$1-\}")
P=$(eval echo\ "{${S// /}}")
echo {${${P//(--| )/,}//-/}}

SET1='{a,b,c}'; SET2='{1,2,3}'
./power-set.sh $SET1
./power-set.sh $SET2
./cart-prod.sh $SET1 $SET2