This Node.js CLI script takes a list of strings in a text file and tests all combinations of pairs, outputting a list of (possibly) unregistered ".com" domains.
Installation:
npm install
Usage:
node domain_check.js strings.txt
where strings.txt is a newline-delimited text file, e.g.
foo
bar
baz
goo
gle
face
book
ama
zon
insta
gram