Интерактивная система просмотра системных руководств (man-ов)
cu (1)
cu (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
>> cu (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
cu (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
BSD mandoc
NAME
cu
- call UNIX
SYNOPSIS
[-ehot
]
[-a acu
]
[-l line
]
[-s speed | -speed
]
[phone-number
]
DESCRIPTION
The
utility
establishes a full-duplex connection to another machine, giving the
appearance of being logged in directly on the remote CPU.
It goes without saying that you must have a login on the machine (or
equivalent) to which you wish to connect.
The options are as follows:
-a acu
Set the acu.
-e
Use even parity.
If both
-e
and
-o
are given, then no parity is used
(the default).
-h
Echo characters locally (half-duplex mode).
-l line
Specify the line to use.
Either of the forms like
cuad0
or
/dev/cuad0
are permitted.
-o
Use odd parity.
If both
-e
and
-o
are given, then no parity is used
(the default).
-s speed | -speed
Set the speed of the connection.
The default is 9600.
-t
Connect via a hard-wired connection to a host on a dial-up line.
Typed characters are normally transmitted directly to the remote
machine (which does the echoing as well).
A tilde
(`~'
)
appearing as the first character of a line is an escape signal; the
following are recognized:
~^D or ~.
Drop the connection and exit.
Only the connection is dropped - the login session is not terminated.
~c [name
]
Change directory to
name
(no argument implies change to home directory).
~!
Escape to a shell (exiting the shell will return to
)
~>
Copy file from local to remote.
The
utility
prompts for the name of a local file to transmit.
~<
Copy file from remote to local.
The
utility
prompts first for the name of the file to be sent, then for a command
to be executed on the remote machine.
~p from [to
]
Send a file to a remote
UNIX
host.
This command causes the remote
UNIX
system to run the following command string,
sending it the
from
file:
"stty -echo; cat > 'to'; stty echo"
If the
to
file is not specified, the
from
file name is used.
This command is actually a
UNIX
specific version of the
~>
command.
~t from [to
]
Take a file from a remote
UNIX
host.
As in the
~p
command, the
to
file defaults to the
from
file name if it is not specified.
The remote host executes the following command string
to send the file to
:
"cat 'from'; echo '' | tr '\012' '\01'"
~|
Pipe the output from a remote command to a local
UNIX
process.
The command string sent to the local
UNIX
system is processed by the shell.
~$
Pipe the output from a local
UNIX
process to the remote host.
The command string sent to the local
UNIX
system is processed by the shell.
~C
Fork a child process on the local system to perform special protocols
such as
XMODEM
The child program will be run with the following arrangement of
file descriptors:
0 <-> remote tty in
1 <-> remote tty out
2 <-> local tty stderr
~#
Send a
BREAK
to the remote system.
For systems which do not support the necessary
ioctl ();
call, the break is simulated by a sequence of line speed changes and
DEL
characters.
~s
Set a variable (see the discussion below).
~v
List all variables and their values (if set).
~^Z
Stop
(only available with job control).
~^Y
Stop only the
``local side''
of
(only available with job control); the
``remote side''
of
,
the side that displays output from the remote host, is left running.
~?
Get a summary of the tilde escapes.
When
prompts for an argument, for example during setup of a file transfer, the
line typed may be edited with the standard erase and kill characters.
A null line in response to a prompt, or an interrupt, will abort the
dialogue and return the user to the remote machine.
The
utility
guards against multiple users connecting to a remote system by opening
modems and terminal lines with exclusive access, and by honoring the
locking protocol used by
uucico(8)PqPaports/net/freebsd-uucp.
During file transfers
provides a running count of the number of lines transferred.
When using the
~>
and
~<
commands, the
eofread
and
eofwrite
variables are used to recognize end-of-file when reading, and specify
end-of-file when writing (see below).
File transfers normally depend on hardwareflow or tandem mode for flow control.
If the remote system does not support hardwareflow or tandem mode,
echocheck
may be set to indicate that
should synchronize with the remote system on the echo of each
transmitted character.
When
must dial a phone number to connect to a system, it will print various
messages indicating its actions.
The
utility
supports a variety of auto-call units and modems with the
at
capability in system descriptions.
Support for Ventel 212+ (ventel), Hayes AT-style (hayes),
USRobotics Courier (courier), Telebit T3000 (t3000) and
Racal-Vadic 831 (vadic) units is enabled by default.
Support for Bizcomp 1031[fw] (biz31[fw]), Bizcomp 1022[fw]
(biz22[fw]), DEC DF0[23]-AC (df0[23]), DEC DN-11 (dn11) and
Racal-Vadic 3451 (v3451) units can be added by recompiling
with the appropriate defines.
Note that if support for both the Racal-Vadic 831 and 3451 is enabled,
they are referred to as the v831 and v3451, respectively.
If only one of the two is supported, it is referred to as vadic.
Variables
The
utility
maintains a set of variables which control its operation.
Some of these variables are read-only to normal users (root is allowed
to change anything of interest).
Variables may be displayed and set through the
~s
escape.
The syntax for variables is patterned after
vi(1)
and
Mail(1).
Supplying
``all
''
as an argument to the set command displays all variables readable by
the user.
Alternatively, the user may request display of a particular variable
by attaching a
`?'
to the end.
For example,
``escape?
''
displays the current escape character.
Variables are numeric, string, character, or boolean values.
Boolean variables are set merely by specifying their name; they may be
reset by prepending a
`!'
to the name.
Other variable types are set by concatenating an
`='
and the value.
The entire assignment must not have any blanks in it.
A single set command may be used to interrogate as well as set a
number of variables.
Certain common variables have abbreviations.
The following is a list of common variables, their abbreviations, and
their default values:
baudrate
(Vt num
)
The baud rate at which the connection was established;
abbreviated
ba
beautify
(Vt bool
)
Discard unprintable characters when a session is being
scripted; abbreviated
be
dialtimeout
(Vt num
)
When dialing a phone number, the time (in seconds) to wait for a
connection to be established; abbreviated
dial
echocheck
(Vt bool
)
Synchronize with the remote host during file transfer by
waiting for the echo of the last character transmitted; default is
off
eofread
(Vt str
)
The set of characters which signify an end-of-transmission
during a
~<
file transfer command; abbreviated
eofr
eofwrite
(Vt str
)
The string sent to indicate end-of-transmission during a
~>
file transfer command; abbreviated
eofw
eol
(Vt str
)
The set of characters which indicate an end-of-line.
The
utility
will recognize escape characters only after an end-of-line.
escape
(Vt char
)
The command prefix (escape) character; abbreviated
es
default value is
`~'
exceptions
(Vt str
)
The set of characters which should not be discarded due to the
beautification switch; abbreviated
ex
default value is
``\t\n\f\b
''
force
(Vt char
)
The character used to force literal data transmission;
abbreviated
fo
default value is
`^P'
framesize
(Vt num
)
The amount of data (in bytes) to buffer between file system
writes when receiving files; abbreviated
fr
hardwareflow
(Vt bool
)
Whether hardware flow control (CRTSCTS) is enabled for the
connection; abbreviated
hf
default value is
off
host
(Vt str
)
The name of the host to which you are connected; abbreviated
ho
linedisc
(Vt num
)
The line discipline to use; abbreviated
ld
prompt
(Vt char
)
The character which indicates an end-of-line on the remote
host; abbreviated
pr
default value is
`\n'
This value is used to synchronize during data transfers.
The count of lines transferred during a file transfer command is based
on receipt of this character.
raise
(Vt bool
)
Upper case mapping mode; abbreviated
ra
default value is
off
When this mode is enabled, all lowercase letters will be mapped to
uppercase by
for transmission to the remote machine.
raisechar
(Vt char
)
The input character used to toggle uppercase mapping mode;
abbreviated
rc
not set by default.
record
(Vt str
)
The name of the file in which a session script is recorded;
abbreviated
rec
script
(Vt bool
)
Session scripting mode; abbreviated
sc
default is
off
When
script
is
true
will record everything transmitted by the remote machine in the script
record file specified in
record
If the
beautify
switch is on, only printable
ASCII
characters will be included in the script file (those characters
between 040 and 0177).
The variable
exceptions
is used to indicate characters which are an exception to the normal
beautification rules.
tabexpand
(Vt bool
)
Expand tabs to spaces during file transfers; abbreviated
tab
default value is
false
Each tab is expanded to 8 spaces.
tandem
(Vt bool
)
Use XON/XOFF flow control to throttle data from the remote host;
abbreviated
ta
The default value is
true
verbose
(Vt bool
)
Verbose mode; abbreviated
verb
default is
true
When verbose mode is enabled,
prints messages while dialing, shows the current number of lines
transferred during a file transfer operations, and more.
ENVIRONMENT
HOME
The home directory to use for the
~c
command.
SHELL
The name of the shell to use for the
~!
command; default value is
``/bin/sh
''
FILES
/var/log/aculog
line access log
/var/spool/lock/LCK..*
lock file to avoid conflicts with
uucp(1)PqPaports/net/freebsd-uucp
