Annex one or more files.

annex

#! /bin/bash
set -eu

annex ()
{
  local option
  local OPTARG
  local OPTIND
  local recursive=
  local user=${SUDO_UID:-$(id -ru)}
  local group=${SUDO_GID:-$(id -rg)}
  while getopts ':R' option; do
    case $option in
      R) recursive=-R;;
      \?) echo "Invalid option -$OPTARG" >&2; return 1;;
    esac
  done
  shift $((OPTIND-1))
  for file; do
    chown $recursive "$user:$group" "$file"
  done
}

annex "$@"