Documented in Volume 1 of the UNIX Programmers Manual.
....is a 4.2bsd command
cod% rcp foo marlin:foo
causes a copy of the local file 'foo' to the marlin file 'foo'
(placed in your home directory).
cod% rcp marlin:myfile myfile
causes a copy of the marlin file 'myfile' (in your home directory)
to the local file 'myfile'
cod% rcp -r * marlin:.
causes a mass transfer of the local directory (including dot-files).
All its contents will be copied to the marlin (in your home directory).
guppy% rcp -r /va/kemp/example/local bass:example
will cause the guppy directory named /va/kemp/example/local to be copied
to your bass login directory named example/local.
The bass directory will be created if it does not exist.
If it does exist, any files with names matching those in the guppy
directory will be overwritten.
Files in the bass directory with names not matching will be unchanged.
NOTE: Note the non-identical names: if bass:example/local had
been specified, the result would be files stored into
example/local/local, which is probably NOT what you want.