Example pipeline that adds an absolute timestamp and converts to CSV.

    sample-timestamp --input log.txt --relative-name now | \
      sample-convert --output-format csv > log.csv  

Example input:

    analog=251, dry=0, pumping_water=0, last_watering_started=234, last_watering_stopped=235, now=346

Example output:

    now,analog,dry,pumping_water,last_watering_started,last_watering_stopped,timestamp
    346,251,0,0,234,235,1425594335
    347,249,0,0,234,235,1425594336
    348,248,0,0,234,235,1425594337
    349,245,0,0,234,235,1425594338