Files for practicing shell data-processing commands:
  sort, head, tail, grep, paste, cut, wc, uniq

  measurements.csv  - experimental measurements in CSV format
  run.log           - simulation log with INFO / WARNING / ERROR entries
  x_values.txt      - x-axis values, one per line
  y_values.txt      - matching y-axis values, one per line
  scores.txt        - unsorted list of trial scores

Example commands (combine with pipes!):
  head measurements.csv
  grep FAIL measurements.csv
  grep ERROR run.log | wc -l
  sort -n scores.txt | tail -5
  paste x_values.txt y_values.txt
