*** UNIX MANUAL PAGE BROWSER ***

CU(1) General Commands Manual CU(1) NAME cu, ct - call out to a terminal or another system SYNOPSIS cu [ -htn ] [ -p parity ] [ -s speed ] telno [ service-class ] ct [ option ... ] phone-number [ service-class ] DESCRIPTION Cu places a data call to a given telephone number and expects a com- puter to answer. It manages an interactive conversation with possible transfers of text files. Telno is the telephone number, consisting of digits with minus signs at appropriate places to indicate delay for second or subsequent dial tones. A telephone number may also be ex- pressed symbolically. A symbolic number is looked up in the files and whose lines look like this: symbolic-number actual-number service-class comment The actual number may be preceded by options such as -t. The comment, if present, is printed out when the connection is made. The options are -n Print the the called number but do not call it. -t Tandem: use DC1/DC3 (control-S/control-Q) protocol to stop transmission from the remote system when the local terminal buffers are almost full. This argument should only be used if the remote system understands that protocol. -h Half-duplex: echo locally the characters that are sent to the remote system. -s speed Set the line speed; means 1200 baud, etc. The default depends on service class. -p parity Set the parity of transmitted characters: 0, 1, e, o mean zero, one, even, odd parity. 0 is the default. The service class is expressed as in dialout(3). A special class causes the telno argument to be taken as the pathname of a terminal line. Cu opens the file, sets line speed and other modes, and proceeds as if connected. The default line speed is 9600 baud. An explicit service class on the command line overrides any specified in a file. After making the connection, cu runs as two processes: the sending process reads the standard input and passes most of it to the remote system; the receiving process reads from the remote system and passes most data to the standard output. Lines beginning with have special meanings. The sending process interprets: ~. ~EOT Terminate the conversation. ~<file Send the contents of file to the remote system, as though typed at the terminal. ~! Invoke an interactive shell on the local system. ~!cmd Run the command on the local system (via ~$cmd Run the command locally and send its output to the remote sys- tem. ~b ~%break Send a break (300 ms space). ~%take from [to] Copy file from (on the remote system) to file to on the local system. If to is omitted, the from name is used both places. ~%put from [to] Copy file from (on local system) to file to on remote system. If to is omitted, the from name is used both places. ~~text send the line ~text. WARNING: Using cu to reach your home machine from a machine you don't trust can be hazardous to your password. Ct places a telephone call to a remote terminal and allows a user to log in on that terminal in the normal fashion. The terminal must be equipped with an auto-answer modem. The phone number and service class are as in cu. The options are -c count If the number doesn't answer, try count times before giving up (default 5). -w interval Space retries interval seconds apart (default 60). -h Try to hang up the phone before placing the call. This is use- ful for a `call me right back' arrangement. FILES SEE ALSO con(1), ttyld(4), dialout(3) BUGS Unless erase and kill characters are the same on the two machines, they will be damaged by ~%put. ~%take uses ~> at the beginning of line to synchronize transmission. This sequence can cause misfunction if it is received for any other purpose. CU(1)