diff --git a/hack/update_oneline_install.sh b/hack/update_oneline_install.sh
index 90bc49e..f2a4bb3 100755
--- a/hack/update_oneline_install.sh
+++ b/hack/update_oneline_install.sh
@@ -1,11 +1,11 @@
 #!/usr/bin/env bash
-if [ "$(uname)" == "Darwin" ]; then
-    readlink_cmd="greadlink" 
-    sed_cmd="gsed"
-else
-    readlink_cmd="readlink"
-    sed_cmd="sed"
-fi
-SCRIPT_DIR="$(dirname $($readlink_cmd -f $0))"
+set -eo pipefail
+shopt -s expand_aliases
 
-$sed_cmd -i "s/SHA=\w\+/SHA=$(sha256sum hack/bootstrap_tfw_dev.sh | cut -d ' ' -f1)/g" "${SCRIPT_DIR}/oneline_install.sh"
+if [ "$(uname)" == "Darwin" ]; then
+    alias readlink="greadlink" 
+    alias sed="gsed"
+fi
+SCRIPT_DIR="$(dirname $(readlink -f $0))"
+
+sed -i "s/SHA=\w\+/SHA=$(sha256sum hack/bootstrap_tfw_dev.sh | cut -d ' ' -f1)/g" "${SCRIPT_DIR}/oneline_install.sh"