in reply to Find the PID of current program

Have a look at Log::Log4perl. It provides the PID functionality you want, besides being a powerful log framework:
#!/usr/bin/perl use strict; use warnings; use Log::Dispatch::FileRotate; use Log::Log4perl; my $conf = qq( log4perl.category.Pid = INFO, ScreenAppender, PidFileRotate +Appender log4perl.appender.ScreenAppender = Log::Log4perl::Appender:: +Screen log4perl.appender.ScreenAppender.stderr = 0 log4perl.appender.ScreenAppender.layout = PatternLayout log4perl.appender.ScreenAppender.layout.ConversionPattern=[%P] %p %d + %F:%L %m%n log4perl.appender.ScreenAppender.Threshold = DEBUG log4perl.appender.PidFileRotateAppender = Log::Dispatch::F +ileRotate log4perl.appender.PidFileRotateAppender.filename = pid.$$.log log4perl.appender.PidFileRotateAppender.mode = append log4perl.appender.PidFileRotateAppender.size = 10000 log4perl.appender.PidFileRotateAppender.max = 5 log4perl.appender.PidFileRotateAppender.layout = PatternLayout log4perl.appender.PidFileRotateAppender.layout.ConversionPattern=[%P +] %p %d %F:%L %m%n ); Log::Log4perl::init( \$conf ); my $log = Log::Log4perl::->get_logger(q(Pid)); # log messages of various severity $log->debug(qq{Hey hey my my}) if $log->is_debug(); $log->info(qq{Hey hey my my}) if $log->is_info(); $log->warn(qq{Hey hey my my}) if $log->is_warn(); $log->error(qq{Hey hey my my}) if $log->is_error(); $log->fatal(qq{Hey hey my my}) if $log->is_fatal(); # die with a log message $log->logdie(qq{Hey hey my my});
Writes both to screen (STDOUT) and a file named pid.pid.log that is rotated on 50K:
[4548] INFO 2006/11/30 07:36:31 586445.pl:30 Hey hey my my [4548] WARN 2006/11/30 07:36:31 586445.pl:31 Hey hey my my [4548] ERROR 2006/11/30 07:36:31 586445.pl:32 Hey hey my my [4548] FATAL 2006/11/30 07:36:31 586445.pl:33 Hey hey my my [4548] FATAL 2006/11/30 07:36:31 586445.pl:35 Hey hey my my
Andreas
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