ct(1C) Communication Commands ct(1C)
ct - spawn login to a remote terminal
ct [options] telno...
The ct utility dials the telephone number of a modem that is attached
to a terminal and spawns a login process to that terminal. The telno is
a telephone number, with equal signs for secondary dial tones and minus
signs for delays at appropriate places. (The set of legal characters
for telno is 0 through 9, -, =, *, and #. The maximum length telno is
31 characters). If more than one telephone number is specified, ct will
try each in succession until one answers; this is useful for specifying
alternate dialing paths.
ct will try each line listed in the file /etc/uucp/Devices until it
finds an available line with appropriate attributes, or runs out of
After the user on the destination terminal logs out, there are two
things that could occur depending on what type of port monitor is moni‐
toring the port. In the case of no port monitor, ct prompts: Reconnect?
If the response begins with the letter n, the line will be dropped;
otherwise, ttymon will be started again and the login: prompt will be
printed. In the second case, where a port monitor is monitoring the
port, the port monitor reissues the login: prompt.
The user should log out properly before disconnecting.
The following options are supported:
-h Normally, ct will hang up the current line so that it can
be used to answer the incoming call. The -h option will
prevent this action. The -h option will also wait for the
termination of the specified ct process before returning
control to the user's terminal.
-sspeed The data rate may be set with the -s option. speed is
expressed in baud rates. The default baud rate is 1200.
-v If the -v (verbose) option is used, ct will send a running
narrative to the standard error output stream.
-wn If there are no free lines ct will ask if it should wait,
and for how many minutes, before it gives up. ct will con‐
tinue to try to open the dialers at one-minute intervals
until the specified limit is exceeded. This dialogue may be
overridden by specifying the -wn option. n is the maximum
number of minutes that ct is to wait for a line.
-xn This option is used for debugging; it produces a detailed
output of the program execution on stderr. n is a single
number between 0 and 9. As n increases to 9, more detailed
debugging information is given.
See attributes(5) for descriptions of the following attributes:
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
│Availability │SUNWbnuu │
cu(1C), login(1), uucp(1C), ttymon(1M), attributes(5)
The ct program will not work with a DATAKIT Multiplex interface.
For a shared port, one used for both dial-in and dial-out, the ttymon
program running on the line must have the -r and -b options specified
SunOS 5.11 14 Sep 1992 ct(1C)