sh function for finding the first existence of a file in a parent directory. Usage: `lsup [path] file`

lsup.sh

lsup() {
  path="$1";
  file="$2";
  if [ -z "${file}" ]; then
    file="${path}";
    path="$(pwd)";
  fi;
  path="$(realpath -es "${path}")"
  [ -n "${SH_DEBUG}" ] && echo "Searching for ${file} from ${path}…";
  while [ "${path}" != "/" ]; do
    [ -e "${path}/${file}" ] && break;
    [ -n "${SH_DEBUG}" ] && echo "Not found in ${path}";
    path="$(realpath -s "${path}/..")";
  done;
  [ -e "${path}/${file}" ] && echo "${path}/${file}" || return 1;
}