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cu – Used to Connect to Another System Host

The cu command is a Linux utility used to establish a connection with another system host. It is primarily used for serial communication and is commonly used for connecting to system consoles, modems, and other serial devices. The cu command is a simple and effective way to establish a connection between two systems.

Overview

The cu command can be used to connect to another system host by specifying the device file to be used for communication. The basic syntax for the command is as follows:

cu [options] device

Here, device is the device file that corresponds to the serial port that you want to use for communication. For example, if you want to connect to a device that is connected to the first serial port (ttyS0), you would use the following command:

cu -l /dev/ttyS0

Once the connection has been established, you can use the cu command to send and receive data between the two systems. By default, the cu command operates in line mode, which means that it sends and receives data one line at a time. However, you can switch to character mode by pressing the ~ key followed by the . key.

Examples

Here are some examples of how to use the cu command:

  1. Connect to a device connected to the first serial port:
cu -l /dev/ttyS0
  1. Connect to a device connected to the second serial port and specify the baud rate:
cu -l /dev/ttyS1 -s 9600
  1. Connect to a device connected to a USB-to-serial adapter:
cu -l /dev/ttyUSB0

Options

Here are the available options for the cu command:

Option Description
-l Specifies the device file to be used for communication
-s Specifies the baud rate
-e Enables local echo
-n Disables CR/NL translation
-d Enables hardware flow control
-r Enables software flow control
-o Specifies the output file
-i Specifies the input file
-t Specifies the timeout value
-v Enables verbose mode
-h Displays help information

Troubleshooting Tips

Here are some troubleshooting tips for the cu command:

  1. Make sure that you have the correct device file specified. If you are not sure which device file to use, you can check the output of the dmesg command to see which device files have been created.
  2. Check the permissions on the device file. You may need to be root or have the appropriate permissions to access the device file.
  3. Check the baud rate and other settings to make sure that they are correct for the device that you are connecting to.
  4. If you are having trouble establishing a connection, try resetting the device that you are connecting to.

Notes

Here are some additional notes about the cu command:

  • The cu command is a simple and effective way to establish a connection between two systems.
  • The cu command can be used for serial communication with devices such as modems, system consoles, and other serial devices.
  • The cu command operates in line mode by default, but can be switched to character mode by pressing the ~ key followed by the . key.
  • The cu command has a number of options that can be used to customize the behavior of the command.

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