agetty command in Linux with Examples Last Updated : 15 Oct, 2024 Comments Improve Suggest changes Like Article Like Report agetty is a Linux version of getty. getty short for "get tty" is a Unix program running on a host computer that manages physical or virtual terminals to allow multi-user access. Linux provides a virtual terminal(tty) which is similar to the regular Linux terminal. agetty command opens a virtual terminal(tty port), prompts for a login name, and invokes the /bin/login command. Syntaxagetty [options] port [baud_rate...] [term]where,port: It is a pathname relative to the /dev directory. If a "-" is specified, then this command considers that its standard input is already connected to a tty port and that a connection to a remote user has already been established.baud_rate, ...: It is a comma-separated list of one or more baud rates. It should be specified in the descending order.term: It is the value to be used for the TERM environment variable.Common Options used with the agetty commandOptionDescription-8, --8bitsAssume 8-bit tty, meaning full 8-bit data transmission.-a, --autologinAutomatically logs in the specified user without a password prompt.-c, --noresetDo not reset control mode upon start.-E, --remoteAllows passing a hostname to login for remote connections (e.g., via telnetd).-h, --flow-controlEnables hardware flow control using CTS/RTS handshaking for smoother communication.-i, --noissueDo not display the issue file (custom login message).-J, --noclearDo not clear the screen before displaying the login prompt.-m, --extract-baudExtract the baud rate from the terminal device during connection.-n, --skip-loginSkip the login prompt and go directly to session (useful for auto-login setups).-p, --login-pauseWait for the user to press any key before showing the login prompt.-R, --hangupPerform a virtual hangup (vhangup) to disconnect the specified terminal.-s, --keep-baudAttempt to keep the previously used baud rate for the terminal connection.-t, --timeoutSets a timeout (in seconds) to terminate the session if the login prompt is not completed in time.-U, --detect-caseDetect uppercase-only terminals and adjust login accordingly.--helpDisplay a help message with a list of all available options.--versionDisplay the current version of the agetty command.For more details about the options you can run the following command on the terminal: agetty --helpLinux agetty command Examples1. agetty -8 - linux -8 option for 8-bit tty.'-' for specifies that standard input is already connected to a tty port.baud rate is optional so not used here.'linux' is value of TERM environment variable.2. agetty -8 -t 5 - linux -t 5 is the login process timeout.3. agetty -h -t 60 tty 9600 vtxxx tty refers to the device /dev/tty.9600 is the bits per second bound rate.vtxxx is the TERM environment variable to indicate that a VTxxx terminal is connecting, in the previous example 'linux' is used as TERM env.-h activates CTS/RTS handshaking (flow control).-t 60 allows 60 seconds for someone to attempt to log in before the modem is hung up.4. agetty -a -h -t 60 tty 9600 vt102 -a specifies autologin.5. agetty --version To display the version information. 6. agetty -a -h -t 60 -U -s -m tty 9600 vt100 -U detects the uppercase terminal.-s try to use existing baud rate.-m use exact baud rate specified in the command.ConclusionThe agetty command is an essential tool for managing terminal sessions in Linux, particularly for embedded systems, servers, and environments requiring serial connections. 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