man urxvt schrieb
RESOURCES
Note: `urxvt --help' gives a list of all resources (long options) compiled into your version. All
resources are also available as long-options.
You can set and change the resources using X11 tools like xrdb. Many distribution do also load
settings from the ~/.Xresources file when X starts. urxvt will consult the following files/resources
in order, with later settings overwriting earlier ones:
1. app-defaults file in $XAPPLRESDIR
2. $HOME/.Xdefaults
3. RESOURCE_MANAGER property on root-window of screen 0
4. SCREEN_RESOURCES property on root-window of the current screen
5. $XENVIRONMENT file OR $HOME/.Xdefaults-<nodename>
6. resources specified via -xrm on the commandline