screen: Source
4.2 Source
==========
-- Command: source file
(none)
Read and execute commands from file FILE. Source commands may be
nested to a maximum recursion level of ten. If FILE is not an
absolute path and screen is already processing a source command,
the parent directory of the running source command file is used to
search for the new command file before screen's current directory.
Note that termcap/terminfo/termcapinfo commands only work at
startup and reattach time, so they must be reached via the default
screenrc files to have an effect.