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ahitrov@rambler.ru |
#!/usr/bin/perl |
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############################################################################## |
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# $HeadURL: http://svn.dev.rambler.ru/Contenido/trunk/services/logtail $ |
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# $Id: logtail 335 2006-08-10 13:06:40Z lonerr $ |
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# |
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# ������ ���������� ����, �������� ��������� � crontab: |
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# */5 10-19 * * * logtail /.../error_log ~/tmp/error_log.off |
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############################################################################## |
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use strict; |
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use warnings 'all'; |
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use File::stat; |
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use FindBin; |
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if ($#ARGV<0 || $#ARGV>1) { |
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&usage; |
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exit 1; |
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} |
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my $log_file = $ARGV[0]; |
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my $offset_file = $ARGV[1] || "$log_file.offset"; |
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my $stat = stat($log_file) or die "Can't stat $log_file - $!"; |
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my ($prev_size, $prev_ino); |
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if (-f $offset_file) { |
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open OFF, "< $offset_file" or die "Can't read offset_file - $!"; |
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$prev_size = <OFF>; |
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$prev_ino = <OFF>; |
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close OFF; |
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} |
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$prev_size = 0 unless $prev_ino==$stat->ino && $prev_size<=$stat->size; |
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exit if $prev_size==$stat->size; |
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open LOG, "< $log_file" or die "Can't read log - $!"; |
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seek LOG, $prev_size, 0 or die "Can't seek - $!"; |
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my $buf; |
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my $readed = read LOG, $buf, $stat->size - $prev_size; |
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close LOG; |
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die "Can't read log_file - $!" unless $readed; |
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print $buf; |
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open OFF, "> $offset_file" or die "Can't write offset_file - $!"; |
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print OFF $stat->size."\n".$stat->ino."\n$log_file\n".localtime()."\n"; |
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close OFF; |
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sub usage { |
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print <<EOM; |
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Usage: |
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$FindBin::Script logfile [offset.file] |
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EOM |
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} |