Copy files from VMS (ODS-2) filesystem.  Files may be copied to
disk or to standard output.  Transfer modes supported are "text"
(RMS stuff is thrown away, newline is tacked on the end of each
VMS record), and "image" (straight byte-by-byte transfer).	There
were once plans to support a third mode ("binary"), but this has
not yet been implemented.  Defaults for the output destination and
transfer mode are set by #defines, but the destination/mode can be
specified at runtime by using various flags (see "options()").

The input device and directory, if omitted, will default to that of
the previous filespec.  Note that this means that the first filespec
MUST have a directory specified, and (if DFLTDEV is not defined) also
a device as well.  The filename syntax is the same as the standard
VMS naming scheme, except that a "." may be used to separate the
filetype from the version number, and some delimiters may be changed
via #defines, if desired.  (This is all to avoid the possibility of
having to escape some of the characters that the shell treats as
special.)  The device name is the name of the UNIX special file in
/dev, rather than what VMS thinks it would be.

If the first character of argv[0] is "l", or if the "-l" option is
used, the program lists the contents of the directory rather than
copying a file.  At present, only one directory may be listed per
command.