Linux uucico Command

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Linux uucicoIt is a command in Linux systems used to manage the UUCP (Unix-to-Unix Copy) protocol.

uucico has two working modes: active mode and slave mode.

  • When in active mode, uucico calls the remote host;
  • in slave mode, uucico accepts calls from the remote host.

UUCP is a protocol used to transfer files and execute commands between Unix systems,uucicoIt is an important component of the UUCP system, responsible for establishing and maintaining connections with other systems, and handling file transfer and command execution.

UUCP (Unix-to-Unix Copy) is an early network protocol mainly used to transfer files and execute remote commands between Unix systems. It connects two systems through a modem or serial line, and uses simple command and file transfer mechanisms to achieve communication.

The main features of the UUCP protocol include:

  • Asynchronous communication: UUCP communicates through modems or serial lines and supports asynchronous data transmission.
  • File transfer: UUCP can transfer files and directory structures.
  • Remote command execution: UUCP allows commands to be executed on remote systems.

Function of the uucico command:

uucicoThe main function of the command is to manage UUCP connections. It can perform the following tasks:

  • Establish connections：uucicoResponsible for establishing connections with remote systems, usually through a modem or serial line.
  • File transfer：uucicoHandle the sending and receiving of files.
  • Command execution：uucicoCan execute commands on remote systems.
  • Connection maintenance：uucicoResponsible for maintaining the connection status with remote systems and handling connection interruptions and reconnections.

Syntax

uucico [-cCDefqvwz][-i<类型>][-I<文件>][-p<连接端口号码>][-][-rl][-s<主机>][-S<主机>][-u<用户>][-x<类型>][--help]

Parameter Description

  • -c or --quiet When no work is being performed, do not change the contents of the log file or update the current state.
  • -C or --ifwork Only call the host specified by the -s or -S parameter when there is work to be performed.
  • -D or --nodetach Do not detach from the controlling terminal.
  • -e or --loop Execute in slave mode and display a login prompt.
  • -f or --force When an execution error occurs, call the host again without waiting any time.
  • -i<type> or --stdin<type> When using the standard input device, specify the type of the connection port.
  • -I<file> or --config<file> Specify the configuration file to use.
  • -l or --prompt Display a login prompt.
  • -p<port number> or --port<port number> Specify the connection port number.
  • -q or --quiet Do not start the uuxqt service program.
  • -r0 or --slave Start in slave mode.
  • -s<host> or --system<host> Call the specified host.
  • -u<user> or --login<user> Specify the user account for login, and do not allow entering an arbitrary login account.
  • -v or --version Display version information and exit the program.
  • -w or --wait In active mode, when performing a call action, display a login prompt.
  • -x<type> or -X<type> or outgoing-debug<type> Start the specified debug mode.
  • -z or --try-next When execution is unsuccessful, try the next option without ending the program.
  • --help Display help and exit the program.

Common options:

  • -r1: Run in master mode (Master Mode)uucico, that is, actively initiate connections.
  • -r0: Run in slave mode (Slave Mode)uucico, that is, wait for remote systems to connect.
  • -s 系统名称: Specify the name of the system to connect to.
  • -x 调试级别: Set the debug level, used to debuguucicothe running process of uucico.

Examples

Suppose we want to actively connect to a remote system namedremote_system, you can use the following command:

uucico -r1 -s remote_system

In this command,-r1means to run in master mode,-s remote_systemspecifies the name of the system to connect to.

If we wantuucicoto wait for a remote system to connect, you can use the following command:

uucico -r0

In this command,-r0means to run in slave mode,uucicowill wait for the remote system to initiate a connection.

uucico Configuration Files

uucicoThe behavior of uucico can be customized through configuration files. The main configuration files include:

  • /etc/uucp/sys: Define connection information for remote systems, such as telephone numbers, login names, passwords, etc.
  • /etc/uucp/port: Define the configuration of serial ports and modems.
  • /etc/uucp/config: Defineuucicothe global configuration of uucico.

Configure Remote Systems

In/etc/uucp/sysIn the 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,systemspecifies the name of the remote system,phonespecifies the dialing number,loginandpasswordspecifies the login name and password.

Configure Serial Ports

In/etc/uucp/portIn the file, you can define the configuration of the serial port. For example:

port ttyS0
    type modem
    speed 9600

In this configuration,portspecifies the name of the serial port,typespecifies the port type (such as a modem),speedspecifies the baud rate.

Debugging uucico

uucicoIt provides debugging features that can help us diagnose connection problems. Through-xthe option, you can set the debug level. For example:

uucico -r1 -s remote_system -x9

In this command,-x9means setting the debug level to 9,uucicoit will output detailed debugging information.

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