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First perlmonks post. If you have very large log files or slow disk, or both... As long as the log file is ordered by datetime, you can use Search::Dict's binary search to find entries for datetimes. (this code has not been extensively tested)
#! perl -W use strict; use warnings; # Yes, I know it's big and slow, room for improvment here use Date::Manip; use Search::Dict; # The log file must be ordered by date for this to work. # Use it like this: # search_log /var/log/httpd/access_log "2008052205:32:43" # or # search_log /var/log/httpd/access_log "2008052205:32:4" # search_log /var/log/httpd/access_log "2008052205:32:" # search_log /var/log/httpd/access_log "2008052205:32" # search_log /var/log/httpd/access_log "2008052205:3" my $file = shift or die 'no file'; my $search_date = shift or die 'no search date in YYYYMMDDHH::MM::SS f +ormat'; open my $fh,'<',$file or die $!; sub get_date{ my($line) = @_; my($d) = $line=~/\[(.*)\]/mxo or die "Can't find [date] in line: $ +line"; return ParseDate($d) or die "Can't parse date: $d"; } my $pos = look $fh,$search_date,{ xfrm=>*get_date, }; if(-1 == $pos){ die "Error looking for '$search_date' in file '$file': $!\n"; } while(my $line=<$fh>){ if(get_date($line) =~m/$search_date/mxo){ print $line; } else { last; } }

In reply to Using Search::Dict on log files by stigpje

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