Split log file by time range

Question

I have a log file and would like to cut it into copies of 15min. In the log file the lines start with:

dd mmm yyyy hh:mm:ss,xxx 

e.g.

12 Feb 2013 16:05:02,xxx log text...

and the file rotates every hour so I would like to take a copy of the log file, split it into 15min of logging and have say 4 log files.

Answer 1

Maybe this one does the job:

INNAME="krasser.log";
OUTNAME="speck.log";
cat $INNAME | grep -v '^$' |
while read r; do
  LOG_NUM=$(($(echo $r | cut -d' ' -f4 | cut -d':' -f2 | cut -d',' -f1)/15));
  [ "$r" ] && echo $r >> $OUTNAME.$LOG_NUM;
done

cronosplit is probably the way to go. but if you need a fast "one-time"-solution. you'll maybe happier with the "one-liner".