This is a Bash implementation of what I only discovered after writing already existed as CombinatorX in the hashcat-utils.

This script combines words from an arbitrary number of lists into a single list.

There isn't an arbitrary limit of eight lists like combinatorX, but there may be more fundamental restrictions behind it that may also apply to this script.

There are some resource lists I found online included. There's also an old version for giggles.

Here is an example.

a.txt   b.txt   c.txt
a1      b1      c1
a2      b2      c2
a3      b3      c3

./wordlist-combinator -o combinated.txt a.txt b.txt c.txt

combinated.txt

a1b1c1
a1b1c2
a1b1c3
a1b2c1
a1b2c2
a1b2c3
a1b3c1
a1b3c2
a1b3c3
a2b1c1
a2b1c2
a2b1c3
a2b2c1
a2b2c2
a2b2c3
a2b3c1
a2b3c2
a2b3c3
a3b1c1
a3b1c2
a3b1c3
a3b2c1
a3b2c2
a3b2c3
a3b3c1
a3b3c2
a3b3c3