Count number of lines in log per day with specific string (good found counting number of server restarts for example)

count_restarts.sh

#!/bin/bash

perl -e 'use POSIX qw(strftime); $i=0; while($i<10) { $dt=strftime "%Y-%m-%d",localtime(time()- 3600*$i*24); print $dt.": "; print `cat server.log | grep "server restarted" | grep -c "$dt"`; $i++; }'