password generator + key-store

genpasswd.sh

#!/bin/bash
# Generates a random password using only non-ambiguous alphanumeric characters
# Usage: genpasswd.sh [length]
# 
# @link https://gist.github.com/lavoiesl/11023640

length=16

if [[ -n "$1" ]]; then
  length="$1"
fi

head -c $(( 2 * length)) /dev/urandom | base64 | sed -E 's/[^23456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ]//g' | head -c "${length}"

echo

key-random.sh

#!/bin/bash
# Generate a random string for a given key using genpasswd.sh, 
# store it into ~/.key-random and return it. 
# If key already exists, return it instead of regenerating a new one.
#
# @link https://gist.github.com/lavoiesl/11023640

store="$HOME/.key-random"

if [ -z "$1" ]; then
  echo "Usage: key-random.sh key [length]" >&2
  exit 1;
fi

key="$1"
touch "$store"

pass=$(grep "^$key=" "$store" | sed "s/^$key=//")

if [ -z "$pass" ]; then
  length="$2"
  pass=$(genpasswd.sh "${length}")
  echo "${key}=${pass}" >> "${store}"
fi

echo "${pass}"