message: Check if tracing is enabled before call trace-cmd extract
diff: #!/bin/bash
  +TRACE_ENABLED=0
  +
  +if [ -r /sys/kernel/tracing/tracing_on ]; then
  + read -N 1 TRACE_ENABLED < /sys/kernel/tracing/tracing_on
  +fi
  +
  +if [ ${TRACE_ENABLED} -eq 0 ]; then
  + echo -e "ERROR: Tracing is disabled\n"
  + ./trace-cmd-status.sh
  + exit -1
  +fi
  +
  DATE=$(date +%m-%d-%Y_%H-%M-%S)
  CMD="trace-cmd extract -o trace_${DATE}.dat"
  