linux - How to parse last value from CSV every five minutes? -


i need run script parse value csv every 5 minutes should not parse values time should last point.

really putting flesh on @hek2mgl's suggestion , implementing you.

i store last known length of logfile in file called lastlength.

#!/bin/bash  logfile=somelog.csv lastlen=lastlength  # pre-set seek start of file... seek=0  # ... overwrite if there seen value [ -f lastlength ] && seek=$(cat lastlength)  echo debug: starting offset $seek  # update last seen length file - parameters "stat" differ on linux stat -f "%dz" "$logfile" > "$lastlen"  # last line of file starting previous position dd if="$logfile" bs=$seek skip=1 2> /dev/null | tail -1

i using osx, if using linux, parameters stat command in second last line different, probably

stat -c%s "$logfile"  > "$lastlen"

i'll leave put crontab gets called every 5 minutes.


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