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Top Forums UNIX for Beginners Questions & Answers How do I add a log file path to a vi file to monitor all the changes made to the file? Post 303042992 by vbe on Wednesday 15th of January 2020 08:13:51 AM
Old 01-15-2020
Exporting in the environment variable PATH a file name is searching for trouble...

Quote:
how do I add an empty log file (test1.log) to an existing text file to monitor all the changes made to a.txt.
It is unclear to me what you are wanting to achieve, usually you add/use a log file to trace what a program is doing or not... what you seem to be after is more like a history of a file...
 

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Log::Handler::Levels(3pm)				User Contributed Perl Documentation				 Log::Handler::Levels(3pm)

NAME
Log::Handler::Levels - All levels for Log::Handler. DESCRIPTION
Base class for Log::Handler. Just for internal usage and documentation. METHODS
Default log level debug() info() notice() warning(), warn() error(), err() critical(), crit() alert() emergency(), emerg() Checking for active levels is_debug() is_info() is_notice() is_warning(), is_warn() is_error(), is_err() is_critical(), is_crit() is_alert() is_emergency(), is_emerg() Special level fatal() Alternative for the levels "critical" - "emergency". is_fatal() Check if one of the levels "critical" - "emergency" is active. Special methods trace() This method is very useful if you want to add a full backtrace to your message. Maybe you want to intercept unexpected errors and want to know who called "die()". $SIG{__DIE__} = sub { $log->trace(emergency => @_) }; By default the backtrace is logged as level "debug". # would log with the level debug $log->trace('who called who'); If you want to log with another level then you can pass the level as first argument: $log->trace(info => $message); dump() If you want to dump something then you can use "dump()". The default level is "debug". my %hash = (foo => 1, bar => 2); $log->dump(\%hash); If you want to log with another level then you can pass the level as first argument: $log->dump($level => \%hash); die() This method logs the message to the output and then call "Carp::croak()" with the level "emergency" by default. $log->die('an emergency error here'); If you want to log with another level, then you can pass the level as first argument: $log->die(fatal => 'an emergency error here'); log() With this method it's possible to log messages with the log level as first argument: $log->log(info => 'an info message'); Is the same like $log->info('an info message'); and $log->log('an info message'); If you log without a level then the default level is "info". PREREQUISITES
Carp Data::Dumper EXPORTS
No exports. REPORT BUGS
Please report all bugs to <jschulz.cpan(at)bloonix.de>. If you send me a mail then add Log::Handler into the subject. AUTHOR
Jonny Schulz <jschulz.cpan(at)bloonix.de>. COPYRIGHT
Copyright (C) 2007-2009 by Jonny Schulz. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-11-21 Log::Handler::Levels(3pm)
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