password generation command and shell script for creating hash based deterministic passwords from master password and string, eg: `passgen string 16`

gistfile1.txt

head -c 500 /dev/urandom | tr -dc a-z0-9 | head -c 32; echo

passgen

#!/bin/bash
read -s -p "Enter master password: " pass
echo
echo "Password for '$1'(${2:-32} chars) is: "
echo $1:$pass | sha512sum | base64 | head -c ${2:-32}
echo
unset pass