I can't find it within man page.
I am using rxvt-unicode-256color from debian squeeze mirror.
Gnome 3 environment, composite enabled in xorg.conf.
Install wmctrl
$ sudo apt-get install wmctrl
Create the extension directory
$ mkdir -p ~/.urxvt/ext/
Create a plugin for Rxvt
$ vi ~/.urxvt/ext/fullscreen
#!perl
sub on_user_command {
my ($self, $cmd) = @_;
if ($cmd eq "fullscreen:switch") {
my $dummy = `wmctrl -r :ACTIVE: -b toggle,fullscreen` ;
}
}
Enable the plugin
$ vi ~/.Xdefaults
...
" Fullscreen switch
URxvt.perl-ext-common: fullscreen
URxvt.keysym.F11: perl:fullscreen:switch
Now, you can toggle fullscreen with the F11 key.
Reference: