tegrakernel/kernel/kernel-4.9/tools/testing/selftests/ftrace/test.d/00basic/basic3.tc

#!/bin/sh
# description: Basic trace clock test
test -f trace_clock
for c in `cat trace_clock | tr  -d \[\]`; do
  echo $c > trace_clock
  grep '\['$c'\]' trace_clock
done
echo local > trace_clock