I do it like this: 

use Log::Log4perl;
my $logfile = 'clean.log';
unlink $logfile;        # ignore errors
do {                # Isolate
    # Log configuration.
    # If you go for interpolation, escape the {} in the pattern or use
    # different delimiters or something.
    my $lconf = q{
    log4perl.logger = TRACE, ap1
    log4perl.appender.ap1 = Log::Log4perl::Appender::File
    log4perl.appender.ap1.filename = } . $logfile . q'
    log4perl.appender.ap1.layout = Log::Log4perl::Layout::PatternLayou
+t
    log4perl.appender.ap1.layout.ConversionPattern = %d{yyyyMMdd HH:mm
+:ss.SSSS} %5p %F{1} %L: %m %n
        log4perl.appender.ap2 = Log::Log4perl::Appender::Screen
        log4perl.appender.ap2.layout = Log::Log4perl::Layout::PatternL
+ayout
        log4perl.appender.ap2.layout.ConversionPattern = %d{yyyyMMdd H
+H:mm:ss.SSSS} %5p %F{1} %L: %m %n
    ';
    # unclear, but this MIGHT mean something.
    Log::Log4perl::init ( \$lconf ) or die "Log init failed";
};                # Isolate
my $logger = Log::Log4perl->get_logger('Test');

[download]
That is, by using substitution within the quoted string config.

You could also do it using function-call config, and possibly by doing a string config and then overriding that one thing with a function call, I believe, but I haven't done that, so I won't give you fake example code.

In reply to Re: log4Perl dynamic filename by dd-b
in thread log4Perl dynamic filename by fritz1968

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.