file contains a number of lines specifying a device together with a list
of devices with associated protections.
Comments start with a
and extend to the end of the line.
Blank lines or lines with only a comment are ignored.
All other lines consist of three fields delimited by
whitespace: a login device
an octal permission number (0600), and a colon
delimited list of device patterns
All device patterns are absolute paths.
If the tty argument (relative path) matches a login device
name (absolute path), the permissions of the devices in the
colon-delimited list are set as specified in the second
field, and their ownership is changed to that of the UID
and GID arguments.