remote
—
remote host description file
The systems known by
tip(1) and
their attributes are stored in an ASCII file which is structured somewhat like
the
termcap(5)
file. Each line in the file provides a description for a single
system. Fields are separated by a colon (``:''). Lines
ending in a \ character with an immediately following newline are continued on
the next line.
The first entry is the name(s) of the host system. If there is
more than one name for a system, the names are separated by vertical bars.
After the name of the system comes the fields of the description. A field
name followed by an `=' sign indicates a string value. A field name followed
by a `#' sign indicates a numeric value.
Entries named ``tip*'' and ``cu*'' are used as default entries by
tip(1),
and the
cu(1)
interface to tip
, as follows. When
tip
is invoked with only a phone number, it looks
for an entry of the form ``tip300'', where 300 is the data rate with which
the connection is to be made. When the cu
interface
is used, entries of the form ``cu300'' are used.
Capabilities are either strings (str), numbers (num), or boolean flags (bool). A
string capability is specified by
capability=value;
for example, ``dv=/dev/harris''. A numeric capability is specified by
capability#value;
for example, ``xa#99''. A boolean capability is specified by simply listing
the capability.
at
- (str) Auto call unit type.
br
- (num) The data rate (bits per second) used for communications on the
serial port. When a modem is used, the data rate used to communicate with
the remote modem may be different than this rate. This is a decimal
number. The default rate is 9600 bits per second.
cm
- (str) An initial connection message to be sent to the remote host. For
example, if a host is reached through a port selector, this might be set
to the appropriate sequence required to switch to the host.
cu
- (str) Call unit if making a phone call. Default is the same as the `dv'
field.
di
- (str) Disconnect message sent to the host when a disconnect is requested
by the user.
du
- (bool) This host is on a dial-up line.
dv
- (str) UNIX device(s) to open to establish a
connection. If this file refers to a terminal line,
tip(1)
attempts to perform an exclusive open on the device to ensure only one
user at a time has access to the port.
el
- (str) Characters marking an end-of-line. The default is
NULL
. `~' escapes are only recognized by
tip
after one of the characters in `el', or after
a carriage-return.
fs
- (str) Frame size for transfers. The default frame size is equal to
BUFSIZ
.
hd
- (bool) The host uses half-duplex communication, local echo should be
performed.
ie
- (str) Input end-of-file marks. The default is
NULL
.
oe
- (str) Output end-of-file string. The default is
NULL
. When tip
is
transferring a file, this string is sent at end-of-file.
pa
- (str) The type of parity to use when sending data to the host. This may be
one of ``even'', ``odd'', ``none'', ``zero'' (always set bit 8 to zero),
``one'' (always set bit 8 to 1). The default is even parity.
pn
- (str) Telephone number(s) for this host. If the telephone number field
contains an @ sign,
tip
searches the file
/etc/phones file for a list of telephone numbers
(see
phones(5)).
tc
- (str) Indicates that the list of capabilities is continued in the named
description. This is used primarily to share common capability
information.
- /etc/remote
- The
remote
host description file resides in
/etc.
Here is a short example showing the use of the capability continuation feature.
It defines a 56k modem connection on the first serial port at 115200 bits per
second, no parity using the Hayes command set with standard line editing and
end of file characters. The arpavax entry includes everything in the
UNIX-57600 entry plus the phone number for arpavax (in this case an @
character so that it is retrieved from the environment).
UNIX-57600:\
:dv=/dev/cuau0:el=^D^U^C^S^Q^O@:oe=^D:du:at=hayes:br#115200:pa=none:
arpavax|ax:\
:pn=\@:tc=UNIX-57600
The remote
file format appeared in
4.2BSD.
The tip(1)
utility uses its own notion of the serial ports data rate rather than the
system default for a serial port.