The cu command is used to call up another system and act as a dial-in terminal. It can also do simple file transfers with no error checking.
cu takes a single argument, besides the options. If the argument is the string "dir" cu will make a direct connection to the port. This may only be used by users with write access to the port, as it permits reprogramming the modem.
Otherwise, if the argument begins with a digit, it is taken to be a phone number to call. Otherwise, it is taken to be the name of a system to call. The -z or --system option may be used to name a system beginning with a digit, and the -c or --phone option may be used to name a phone number that does not begin with a digit.
cu locates a port to use in the UUCP (Unix-to-Unix copy) configuration files. If a simple system name is given, it will select a port appropriate for that system. The -p, --port, -l, --line, -s and --speed options may be used to control the port selection.
When a connection is made to the remote system, cu forks into two processes. One reads from the port and writes to the terminal, while the other reads from the terminal and writes to the port.
cu provides several commands that may be used during the conversation. The commands all begin with an escape character, initially ~ (tilde). The escape character is only recognized at the beginning of a line. To send an escape character to the remote system at the start of a line, it must be entered twice. All commands are either a single character or a word beginning with % (percent sign).
Run command in a shell. If command is empty, starts up a shell.
~$command
Run command, sending the standard output to the remote system.
~|command
Run command, taking the standard input from the remote system.
~+command
Run command, taking the standard input from the remote system and sending the standard output to the remote system.
~#, ~%break
Send a break signal, if possible.
~cdirectory, ~%cddirectory
Change the local directory.
~> file
Send a file to the remote system. This just dumps the file over the communication line. It is assumed that the remote system is expecting it.
~<
Receive a file from the remote system. This prompts for the local file name and for the remote command to execute to begin the file transfer. It continues accepting data until the contents of the eofread variable are seen.
~p from to, ~%putfrom to
Send a file to a remote Unix system. This runs the appropriate commands on the remote system.
~t from to, ~%takefrom to
Retrieve a file from a remote Unix system. This runs the appropriate commands on the remote system.
~s variablevalue
Set a cu variable to the given value. If value is not given, the variable is set to true.
~! variable
Set a cu variable to false.
~z
Suspend the cu session. This is only supported on some systems. On systems for which ^Z may be used to suspend a job, ~^Z will also suspend the session.
~%nostop
Turn off XON/XOFF handling.
~%stop
Turn on XON/XOFF handling.
~v
List all the variables and their values.
~?
List all commands.
Variables
cu also supports several variables. They may be listed with the ~v command, and set with the ~s or ~! commands.
escape
The escape character. Initially ~ (tilde).
delay
If this variable is true, cu will delay for a second after recognizing the escape character before printing the name of the local system. The default is true.
eol
The list of characters that are considered to finish a line. The escape character is only recognized after one of these is seen. The default is carriage return (CR), ^U, ^C, ^O, ^D, ^S, ^Q, ^R.
binary
Whether to transfer binary data when sending a file. If this is false, then newlines in the file being sent are converted to carriage returns. The default is false.
binary-prefix
A string used before sending a binary character in a file transfer, if the binary variable is true. The default is ^V.
echo-check
Whether to check file transfers by examining what the remote system echoes back. The default is false.
echonl
The character to look for after sending each line in a file. The default is carriage return.
timeout
The timeout to use, in seconds, when looking for a character, either when doing echo checking or when looking for the echonl character. The default is 30.
kill
The character to use to delete a line if the echo check fails. The default is ^U.
resend
The number of times to resend a line if the echo check continues to fail. The default is 10.
eofwrite
The string to write after sending a file with the ~> command. The default is ^D.
eofread
The string to look for when receiving a file with the ~< command. The default is $, which is intended to be a typical shell prompt.
verbose
Whether to print accumulated information during a file transfer. The default is true.
Options
-e, --parity=even
Use even parity.
-o, --parity=odd
Use odd parity.
--parity=none
Use no parity. No parity is also used if both -e and -o are given.
-h, --halfduplex
Echo characters locally (half-duplex mode).
--nostop
Turn off XON/XOFF handling (it is on by default).
-E char, --escape char
Set the escape character. Initially ~ (tilde). To eliminate the escape character, use -E ''.
-z system, --systemsystem
The system to call.
-c phone-number, --phone phone-number
The phone number to call.
-p port, --port port
Name the port to use.
-a port
Equivalent to --port port.
-l line, --line line
Name the line to use by giving a device name. This may be used to dial out on ports that are not listed in the UUCP configuration files. Write access to the device is required.
-s speed, --speedspeed
The speed (baud rate) to use.
-#
Where # is a number, equivalent to --speed #.
-n, --prompt
Prompt for the phone number to use.
-d
Enter debugging mode. Equivalent to --debug all.
-x type, --debug type
Turn on particular debugging types. The following types are recognized: abnormal, chat, handshake, uucp-proto, proto, port, config, spooldir, execute, incoming, outgoing. Only abnormal, chat, handshake, port, config, incoming and outgoing are meaningful for cu.
Multiple types may be given, separated by commas, and the --debug option may appear multiple times. A number may also be given, which will turn on that many types from the foregoing list; for example, --debug 2 is equivalent to --debugabnormal, chat. --debug all may be used to turn on all debugging options.
-I file, --config file
Set configuration file to use. This option may not be available, depending upon how cu was compiled.
cu (“調(diào)用”（連接到）另一個Unix系統(tǒng))
在類似Unix的操作系統(tǒng)上，cu命令“調(diào)用”（連接到）另一個Unix 系統(tǒng)。
On Unix-like operating systems, the cu command "calls up" (connect to) another Unix system.
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1 cu 運(yùn)行系統(tǒng)環(huán)境
2 cu 說明
3 cu 語法
4 cu 例子
cu 運(yùn)行系統(tǒng)環(huán)境
Linux
cu 說明
cu命令用于調(diào)用另一個系統(tǒng)并作為撥號終端。它還可以進(jìn)行簡單的文件傳輸，而不會進(jìn)行錯誤檢查。
cu除選項(xiàng)外還接受一個參數(shù)。如果參數(shù)是字符串“ dir”，則cu將直接連接到port。只有對端口具有寫訪問權(quán)的用戶才能使用此功能，因?yàn)樗试S對調(diào)制解調(diào)器進(jìn)行重新編程。
否則，如果參數(shù)以digit開頭，則將其視為要撥打的電話號碼。否則，將其作為要調(diào)用的系統(tǒng)的名稱。該-z或--system選項(xiàng)可以用來名稱以數(shù)字開頭的系統(tǒng)和-c或--phone選項(xiàng)可以被用來命名不以數(shù)字開頭的電話號碼。
cu定位要在UUCP（Unix到Unix副本）配置文件中使用的端口。如果給出一個簡單的系統(tǒng)名稱，它將選擇適合該系統(tǒng)的端口。的-p，--port，-l，--line，-s和--speed選項(xiàng)可以被用于控制端口選擇。
當(dāng)建立連接時到遠(yuǎn)程系統(tǒng)，銅 叉成兩個處理。一個從端口讀取并寫入終端，而另一個從終端讀取并寫入端口。
cu提供了在對話過程中可能會使用的幾個命令。所有命令均以轉(zhuǎn)義 字符開頭，最初為?（波浪號）。轉(zhuǎn)義字符僅在行的開頭識別。要在一行的開頭向遠(yuǎn)程系統(tǒng)發(fā)送一個轉(zhuǎn)義字符，必須輸入兩次。所有命令都是單個字符或以％（百分號）開頭的單詞。
The cu command is used to call up another system and act as a dial-in terminal. It can also do simple file transfers with no error checking.
cu takes a single argument, besides the options. If the argument is the string "dir" cu will make a direct connection to the port. This may only be used by users with write access to the port, as it permits reprogramming the modem.
Otherwise, if the argument begins with a digit, it is taken to be a phone number to call. Otherwise, it is taken to be the name of a system to call. The -z or --system option may be used to name a system beginning with a digit, and the -c or --phone option may be used to name a phone number that does not begin with a digit.
cu locates a port to use in the UUCP (Unix-to-Unix copy) configuration files. If a simple system name is given, it will select a port appropriate for that system. The -p, --port, -l, --line, -s and --speed options may be used to control the port selection.
When a connection is made to the remote system, cu forks into two processes. One reads from the port and writes to the terminal, while the other reads from the terminal and writes to the port.
cu provides several commands that may be used during the conversation. The commands all begin with an escape character, initially ~ (tilde). The escape character is only recognized at the beginning of a line. To send an escape character to the remote system at the start of a line, it must be entered twice. All commands are either a single character or a word beginning with % (percent sign).
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cu 語法
指令
cu可以識別以下命令：
變數(shù)
cu還支持多個變量。它們可能用?v命令列出，并用?s或?！設(shè)置。命令。
選件
可以給出多種類型，用逗號分隔，以及--debug選項(xiàng)可能會出現(xiàn)多次。也可以給出一個數(shù)字，它將打開前面列表中的許多類型。例如，--debug 2相當(dāng)于--debug 異常，聊天。--debug all可用于打開所有調(diào)試選項(xiàng)。
Commands
cu recognizes the following commands:
Variables
cu also supports several variables. They may be listed with the ~v command, and set with the ~s or ~! commands.
Options
Multiple types may be given, separated by commas, and the --debug option may appear multiple times. A number may also be given, which will turn on that many types from the foregoing list; for example, --debug 2 is equivalent to --debug abnormal, chat. --debug all may be used to turn on all debugging options.
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cu 例子
在撥打的電話號碼的系統(tǒng)是（201）555 - 1235。此示例還使用9離開建筑物，以及使用1撥打長途電話。
Dials a system at the phone number is (201) 555-1235. This example is also using a 9 to get out of the building as well as a 1 to dial long distance.
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其他命令行
cut | csplit | crontab | cpio | continue | compress | col | cmp | cksum | chsh | chroot | chkey | cd | chmod | cp | comm | chown | cal | calendar | clear | chfn | cancel | cat | cc | cfdisk | checkeq | checknr | chgrp |