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Full Discussion: tail -f
Top Forums Shell Programming and Scripting tail -f Post 302113853 by Shell_Life on Tuesday 10th of April 2007 04:59:49 PM
Old 04-10-2007
wannalearn,
Would this work for you:
Code:
while true
do
  egrep 'fail' a.log > b.log
  sleep 1
done

Code:


Last edited by Shell_Life; 04-10-2007 at 06:07 PM..
 

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Courier::Filter::Logger::File(3pm)			User Contributed Perl Documentation			Courier::Filter::Logger::File(3pm)

NAME
Courier::Filter::Logger::File - File logger for the Courier::Filter framework SYNOPSIS
use Courier::Filter::Logger::File; my $logger = Courier::Filter::Logger::File->new( file_name => $file_name ); # For use in an individual filter module: my $module = Courier::Filter::Module::My->new( ... logger => $logger, ... ); # For use as a global Courier::Filter logger object: my $filter = Courier::Filter->new( ... logger => $logger, ... ); DESCRIPTION
This class is a file logger class for use with Courier::Filter and its filter modules. It is derived from Courier::Filter::Logger::IOHandle. Constructor The following constructor is provided: new(%options): returns Courier::Filter::Logger::File; throws Courier::Error Creates a new logger that logs messages as lines to a file. Opens the file for writing, creating it if necessary. %options is a list of key/value pairs representing any of the following options: file_name Required. The name of the file to which log messages should be written. timestamp A boolean value controlling whether every log message line should be prefixed with a timestamp (in local time, in ISO format). Defaults to false. Instance methods The following instance methods are provided, as inherited from Courier::Filter::Logger::IOHandle: log_error($text): throws Perl exceptions Logs the error message given as $text (a string which may contain newlines). Prefixes each line with a timestamp if the "timestamp" option has been set through the constructor. log_rejected_message($message, $reason): throws Perl exceptions Logs the Courier::Message given as $message as having been rejected due to $reason (a string which may contain newlines). SEE ALSO
Courier::Filter::Logger::IOHandle, Courier::Filter::Logger, Courier::Filter::Overview. For AVAILABILITY, SUPPORT, and LICENSE information, see Courier::Filter::Overview. AUTHOR
Julian Mehnle <julian@mehnle.net> perl v5.14.2 2011-12-27 Courier::Filter::Logger::File(3pm)
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