diff --git a/test/getenv.sh b/test/getenv.sh
index 6a735b1..7b56c2e 100755
--- a/test/getenv.sh
+++ b/test/getenv.sh
@@ -1,17 +1,17 @@
 #!/usr/bin/env bash
 
-readonly getenv_dir="$(cd "$(dirname -- "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
 get_os_version() {
-  local os_version=
+  readonly getenv_dir="$(cd "$(dirname -- "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
   local utils_version=
+  local os_version=
 
   os_version="$(bash "${getenv_dir}/distro.sh" | sed 's/ /_/g; s/\//-/g')"
 
   bash_version="$(bash --version | sed -n '/bash, [Vv]ersion/p' | sed 's/.*[Vv]ersion \([0-9.]\+\).*/\1/g')"
 
-  if utils_version="$(readlink --version 2>&1 | grep -E "BusyBox")" ; then
+  if utils_version="$(readlink --version 2>&1 | grep "BusyBox")" ; then
     utils_version="$(sed 's/\(BusyBox v[0-9\.]\+\).*/\1/g' <<<${utils_version})"
-  elif utils_version="$(readlink --version 2>&1 | grep -E "GNU core")" ; then
+  elif utils_version="$(readlink --version 2>&1 | grep "GNU core")" ; then
     utils_version="$(sed 's/.*\(GNU [[:alnum:]]\+\). \([0-9\.]\+\).*/\1 \2/g' <<<${utils_version})"
   else
     utils_version="utils_unkown"