# File lib/specinfra/command/freebsd/v8/package.rb, line 20
    def check_is_installed(package, version = nil)
      if version
        shell_ifelse(
          shell_check_pkgng(),
          "pkg query %v #{escape(package)} | grep -- #{escape(version)}",
          "pkg_info -I #{escape(package)}-#{escape(version)}"
        )
      else
        pattern = pkg_info_pattern(package)
        shell_ifelse(
          shell_check_pkgng(),
          "pkg info -e #{escape(package)}",
          "pkg_info -Ix #{escape(pattern)}"
        )
      end
    end