xrdb

X window server's resource database utility for Unix-like systems. More information: https://www.x.org/releases/X11R7.7/doc/man/man1/xrdb.1.xhtml.

• Start xrdb in interactive mode:

xrdb

• Load values (e.g. style rules) from a resource file:

xrdb -load {{~/.Xresources}}

• Query the resource database and print currently set values:

xrdb -query