"${BT_BIN}" "${TRACE_PATH}" "$@" 2>/dev/null > "${tmp_out}"
ok $? "trimmer: ${msg}: exit status"
num_events=$(wc -l < "${tmp_out}")
"${BT_BIN}" "${TRACE_PATH}" "$@" 2>/dev/null > "${tmp_out}"
ok $? "trimmer: ${msg}: exit status"
num_events=$(wc -l < "${tmp_out}")