(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 already processes 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.