#! /bin/sh -e

prog=${0##*/}
usage="usage: $prog MASK CMD [ARGS ...]"
case $1,$# in
  -h,*) echo "$usage"; exit 0 ;;
  -*) echo >&2 "unknown option \`$1'"; exit 1 ;;
  ,0 | *,1) echo >&2 "$usage"; exit 1 ;;
esac
umask $1
shift
exec "$@"