#!/usr/bin/env bash
set -eo pipefail

NVAL=10
SECSIZE=10M

Warn() {
  echo "Usage: cmd [-i] [-p] [-n]" 1>&2; exit 1
}

while getopts ":i:o:n:" opt; do
  case "${opt}" in
    i ) Indir=$OPTARG;;
    o ) Outdir=$OPTARG;;
    n ) Archname=$OPTARG;;
    \? ) Warn ;;
  esac
done
[ -z $Indir ] && Warn
[ -z $Outdir ] && Warn
[ -z $Archname ] && Warn

nice -n$NVAL \
  tar cf - $Indir | \
  bzip2 -c | \
  gpg -c -o- | \
  split -d -b$SECSIZE -a 3 - $Outdir/$Archname.tbz2.gpg-p