my $log4perlConf = q(
    log4perl.appender.scriptName.filename=__PLACEHOLDER__
    log4perl.appender.scriptName.layout=Log::Log4perl::Layout::PatternLayout
    log4perl.logger = INFO, scriptName
);

$log4perlConf =~ s/__PLACEHOLDER__/$logFileName/;

Log::Log4perl::init(\$log4perlConf);