usage() {
  echo "x509 <certfile>"
  echo "x509 -r <hostname:port>"
  return 0
}

[ $# -eq 0 ] && return 0

help=0
remote=0

while getopts ":hr:" arg; do
  case $arg in
    r)
      remote=1
      host=$OPTARG
      ;;
    h|*) help=1
      ;;
  esac
done
[ $help -eq 1 ] && usage 
[ $remote -eq 0 ] && openssl x509 -in $* -noout -text
[ $remote -eq 1 ] && openssl s_client -connect $host < /dev/null | openssl x509 -noout -text