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use POSIX qw(strftime);
$yesterday = strftime( '%d/%m/%y', $time);
`grep "$yesterday" logfile.log | wc -l`
open(LOGFILE,"<", "access.log")or die"Could not open log file.";
my @logfile = <LOGFILE>
my $hits = grep /$yesterday/, @logfile;
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
Results (125 votes),