-git clone https://github.com/kdlucas/byte-unixbench.git /opt/tempT
-make --directory /opt/tempT/UnixBench/
+CLONE_DEST=/opt/tempT
+# remove before cloning
+rm -rf -- "${CLONE_DEST}"
+git clone https://github.com/kdlucas/byte-unixbench.git "${CLONE_DEST}"
+make --directory "${CLONE_DEST}/UnixBench/"