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[ Linux Command Manual](#) Linux `uucico` is a command in Linux systems used to manage the UUCP (Unix-to-Unix Copy) protocol. **uucico has two operating modes: master mode and slave mode.** * When in master mode, uucico calls the remote host; * When in slave mode, uucico accepts calls from the remote host. UUCP is a protocol used for transferring files and executing commands between Unix systems. `uucico` is an important component of the UUCP system, responsible for establishing and maintaining connections with other systems, and handling file transfers and command execution. UUCP (Unix-to-Unix Copy) is an early network protocol primarily used for transferring files and executing remote commands between Unix systems. It connects two systems via modems or serial lines and uses simple commands and file transfer mechanisms for communication. **Key features of the UUCP protocol include:** * **Asynchronous Communication**: UUCP communicates via modems or serial lines, supporting asynchronous data transfer. * **File Transfer**: UUCP can transfer files and directory structures. * **Remote Command Execution**: UUCP allows executing commands on remote systems. **Purpose of the uucico command:** The primary function of the `uucico` command is to manage UUCP connections. It can perform the following tasks: * **Establish Connections**: `uucico` is responsible for establishing connections with remote systems, typically via modems or serial lines. * **File Transfer**: `uucico` handles sending and receiving files. * **Command Execution**: `uucico` can execute commands on remote systems. * **Connection Maintenance**: `uucico` maintains the connection state with remote systems, handling disconnections and reconnections. ### Syntax uucico ### Parameter Description * -c or --quiet: Do not change the log file contents or update the current status when no work is performed. * -C or --ifwork: Call the host specified by the -s or -S parameter only when there is work to be done. * -D or --nodetach: Do not detach from the controlling terminal. * -e or --loop: Execute in slave mode and display the login prompt. * -f or --force: When an execution error occurs, retry calling the host immediately without waiting. * -i or --stdin: Specify the type of the connection port when using the standard input device. * -I or --config: Specify the configuration file to use. * -l or --prompt: Display the login prompt. * -p or --port: Specify the connection port number. * -q or --quiet: Do not start the uuxqt service program. * -r0 or --slave: Start in slave mode. * -s or --system: Call the specified host. * -u or --login: Specify the login user account, and do not allow input of an arbitrary login account. * -v or --version: Display version information and exit the program. * -w or --wait: In master mode, display the login prompt when performing the call action. * -x or -X or --outgoing-debug: Start the specified debug mode. * -z or --try-next: When execution fails, try the next option without exiting the program. * --help: Display help and exit the program. **Common Options:** * `-r1`: Run `uucico` in master mode, i.e., actively initiate a connection. * `-r0`: Run `uucico` in slave mode, i.e., wait for the remote system to connect. * `-s system_name`: Specify the name of the system to connect to. * `-x debug_level`: Set the debug level for debugging the `uucico` runtime process. ### Example Suppose we want to actively connect to a remote system named `remote_system`, we can use the following command: uucico -r1 -s remote_system In this command, `-r1` indicates running in master mode, and `-s remote_system` specifies the name of the system to connect to. If we want `uucico` to wait for the remote system to connect, we can use the following command: uucico -r0 In this command, `-r0` indicates running in slave mode, and `uucico` will wait for the remote system to initiate the connection. * * * ## Configuration Files for uucico The behavior of `uucico` can be customized through configuration files. The main configuration files include: * `/etc/uucp/sys`: Defines connection information for remote systems, such as phone numbers, login names, passwords, etc. * `/etc/uucp/port`: Defines the configuration for serial ports and modems. * `/etc/uucp/config`: Defines the global configuration for `uucico`. ### Configuring a Remote System In the `/etc/uucp/sys` file, you can define an entry for each remote system. For example: system remote_system phone 123-456-7890 login uucp password secret In this configuration, `system` specifies the name of the remote system, `phone` specifies the dialing number, and `login` and `password` specify the login name and password. ### Configuring a Serial Port In the `/etc/uucp/port` file, you can define the configuration for a serial port. For example: port ttyS0 type modem speed 9600 In this configuration, `port` specifies the name of the serial port, `type` specifies the port type (e.g., modem), and `speed` specifies the baud rate. * * * ## Debugging uucico `uucico` provides debugging functionality to help diagnose connection issues. The debug level can be set using the `-x` option. For example: uucico -r1 -s remote_system -x9 In this command, `-x9` sets the debug level to 9, and `uucico` will output detailed debug information. [ Linux Command Manual](#)