gen-pass

#!/bin/bash
# pass-gen - Secure password generator

LEN="${1:-16}"
TYPE="${2:-mix}"

case "$TYPE" in
    simple|1)
        tr -dc 'a-z' </dev/urandom | head -c "$LEN"
        ;;
    mix|2)
        tr -dc 'a-zA-Z' </dev/urandom | head -c "$LEN"
        ;;
    num|3)
        tr -dc 'a-z0-9' </dev/urandom | head -c "$LEN"
        ;;
    strong|4|mix)
        tr -dc 'a-zA-Z0-9!@#$%^&*' </dev/urandom | head -c "$LEN"
        ;;
    ultra|5)
        tr -dc 'a-zA-Z0-9!@#$%^&*()_+-=[]{}|;:,.<>?' </dev/urandom | head -c "$LEN"
        ;;
    passphrase|6)
        WORDS=(apple banana cherry date eagle falcon grape harvest island jungle kernel lemon mango)
        for i in $(seq 1 "$LEN"); do echo -n "${WORDS[$((RANDOM % ${#WORDS[@]}))]}"; [ $i -lt "$LEN" ] && echo -n "-"; done
        echo
        ;;
    xkcd)
        echo "CorrectHorseBatteryStaple" | head -c "$LEN"
        ;;
    *)
        echo "pass-gen v1.0.0 - Password Generator"
        echo "Usage: pass-gen [length] [type]"
        echo ""
        echo "Types:"
        echo "  1 simple    Lowercase only"
        echo "  2 mix      Letters only"
        echo "  3 num      Lower + numbers"
        echo "  4 strong   Letters + symbols (default)"
        echo "  5 ultra    All characters"
        echo "  6 passphrase Word-based"
        ;;
esac