cu

cu [options] [destination] [command]

Call up another Unix system or a terminal via a direct line or a modem. A non-Unix system can also be called.

Options

-bn

Process lines using n-bit characters (7 or 8).

-cname

Search UUCP's Devices file and select the local area network that matches name (this assumes connection to a system).

-C

Instead of entering interactive mode, run the command from the command line with standard input and standard output connected to the remote system. Solaris only.

-d

Print diagnostics.

-e

Send even-parity data to remote system.

-h

Emulate local echo and support calls to other systems expecting terminals to use half duplex mode.

-H

Ignore one hangup. Useful when calling a remote system that will disconnect and call you back with a login prompt. Solaris only.

-lline

Communicate on device named line (e.g., /dev/tty001).

-L

Use the chat sequence specified in /etc/uucp/Systems. Solaris only.

-n

Prompt user for a telephone number.

-o

Use odd parity (opposite of -e).

-sn

Set transmission rate to n (e.g., 1200, 2400, 9600 bps). Default is Any.

-t

Dial an ASCII terminal that has auto-answer set.

Destination

telno	The telephone number of the modem to connect to.
system	Call the system known to uucp (run uuname to list valid system names).
addr	An address specific to your local area network.

cu runs as two processes: transmit and receive. Transmit reads from standard input and passes characters to the remote system; receive reads data from the remote system and passes lines to standard output. Lines that begin with a tilde (~) are treated as commands and not passed.

Transmit Options

~.

Terminate the conversation.

~!

Escape to an interactive shell on the local system.

~!cmd ...

Run command on local system (via sh -c).

~$cmd ...

Run command locally; send output to remote system.

~%cd

Change directory on the local system.

~%take file [target]

Copy file from remote system to target on the local system. If target is omitted, file is used in both places. The remote system must be running Unix for this command to work. No checksumming of the transmitted data is provided.

~%put file [target]

Copy file from the local system to target on the remote system. If target is omitted, file is used in both places. The remote system must be running Unix for this command to work. No checksumming of the transmitted data is provided.

~~ ...

Use two tildes when you want to pass a line that begins with a tilde. This lets you issue commands to more than one system in a cu chain. For example, use ~~. to terminate the conversation on a second system cud to from the first.

~%b

Send a BREAK sequence to the remote system.

~%d

Turn debug mode on or off.

~t

Print termio structure for local terminal. (Intended for debugging.)

~l

Print termio structure for communication line. (Intended for debugging.)

~%ifc

Turn on/off the DC3/DC1 XOFF/XON control protocol (characters ^S, ^Q) for the remainder of the session (formerly ~%nostop, which is still valid).

~%ofc

Set output flow control either on or off.

~%divert

Allow/prevent diversions not specified by ~%take.

~%old

Allow/prevent old-style syntax for diversions received.

Examples

Connect to terminal line /dev/ttya at 9600 baud:

cu -s9600 -l/dev/ttya

Connect to modem with phone number 555-9876:

cu 5559876

Connect to system named usenix:

cu usenix