#/usr/bin/perl

use strict;

my $dir = "/var/log";            # Location of the Log file
my $logfile = "log.txt";        # Name of the Log file
my $maxsize = 2_000_000;        # Max size before rotating
my $maxlogs = 10;            # Number of rotates before archive
my $archivetotal = 5;            # Number of logs to archive
my ($s, $m, $h, $dayOfMonth, $month,                # Create date from
+ local time
    $yearOffset, $dow, $doy, $dst) = localtime();
my $year = 1900 + $yearOffset;
my $date = $year * 1000 + ($month + 1) * 100 + $dayOfMonth;    # Forma
+t Date
my $tarme;    # Store names of files to be archived

### Switch to directory where log file is located
chdir $dir;

### Check Size of log
if(-s $logfile > $maxsize)
{
    ### Rotate old logs
    for(my $i = $maxlogs - 1;$i > 0;$i--)
    {
        if(-e "${logfile}.$i")
        {
            my $j = $i + 1;
            rename "${logfile}.$i", "${logfile}.$j";
        }
    }
    rename "$logfile", "${logfile}.1";
    `echo "" >> $logfile`;
    
    ### Archive logs
    if(-e "${logfile}.$maxlogs")
    {
        for(my $i = $maxlogs - ($archivetotal - 1), my $j = 1;$i <= $m
+axlogs;$i++, $j++)
        {
            rename "${logfile}.$i", "${logfile}.${date}.$j";
            $tarme .= "${logfile}.${date}.$j ";
        }
        
        my $i = 1;
        my $tarfile = "${logfile}.${date}.tar";
        while ( (-e $tarfile) || (-e "${tarfile}.gz") )
        {
            $tarfile = "${logfile}.${date}.tar.$i";
            $i++;
        }
        
        `tar -czf $tarfile $tarme`;
        `rm $tarme`;
        `gzip $tarfile`;
    }
}
else
{
    print "Log file too small to rotate.\n\n";
}

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In reply to Log Rotation by Danikar

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