password_generator.sh

#!/bin/bash

generate_random() {
    RANDOM_NUMBER=`/usr/bin/perl -e 'print int(rand(60453));'`
}

gen_password() {
  generate_random
  randomWord1=`head -$RANDOM_NUMBER ./dizionario.txt | tail -1`
  
  generate_random
  randomWord2=`head -$RANDOM_NUMBER ./dizionario.txt | tail -1`
  
  echo "${randomWord1}-${randomWord2}"
}

numpass=$1; shift

for ((i=1;i<=${numpass};i++)); do
  gen_password
done

Usage:
bash password_generator.sh 500

To obtain 500 lines of new passwords.

dizionario.txt may be any list of words. For example, in italian, you may choose any of the files you may found here.