password_gen

#!/usr/bin/env bash
# Creates alnum passwords of roughly the length requested.
# Alt form xxd -g 2 -l 64 -p /dev/urandom | tr -d '\n'
# (But then has a smaller random space b/c it's [a-f0-9].
# We ask openssl for COUNT * 4 to be overly safe that we'll have that amount
# available after stripping it down to only alphanumeric characters.

set -CEeuo pipefail
IFS=$'\n\t'
shopt -s extdebug

COUNT=${1:-25}
FULL_COUNT=$((COUNT * 4))

openssl rand -base64 "$FULL_COUNT" | tr -cd "[:alnum:]" | head -c "$COUNT"