Password generator with Bash

generate_password.sh

# SC => special characters allowed
SC="_"
while
    _password=$(openssl rand -base64 $(($RANDOM % 6 + 15)) | tr '[:punct:]' $SC)
    [[
        $(echo $_password | grep -o '['$SC']' | wc -l) -lt 2
        || $(echo $_password | grep -o '[0-9]' | wc -l) -lt 2
        || $(echo $_password | grep -o '[A-Z]' | wc -l) -lt 2
        || $(echo $_password | grep -o '[a-z]' | wc -l) -lt 2
    ]]
do true; done

echo $_password

# Example Use
# ===========
# RANDOM_SECRET=$(sh -c "$(curl -fsSL https://gist.githubusercontent.com/fuzziebrain/5e731777811a38ced0d43b3714c6b890/raw/e6b63c6386a59d8cb943094e43f81b6f58f662d0/generate_password.sh)")