TMP=$(mktemp /tmp/selector-cd.XXXXXX)
tail -$((SELECTOR_CD_HISTORY_SIZE-1)) < "${SELECTOR_CD_HISTORY}" > "${TMP}"
cat "${TMP}" > "${SELECTOR_CD_HISTORY}"
TMP=$(mktemp /tmp/selector-cd.XXXXXX)
tail -$((SELECTOR_CD_HISTORY_SIZE-1)) < "${SELECTOR_CD_HISTORY}" > "${TMP}"
cat "${TMP}" > "${SELECTOR_CD_HISTORY}"