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6.3. agetty
agetty is an “alternative getty”. It takes all of its parameters on the command line, with no use of /etc/gettydefs or any other configuration file. agetty is documented in the manual page agetty(8).
Figure 6-5 shows how to invoke agetty for use with a serial console.
ttyS0 refers to the serial device /dev/ttyS0.
9600 is the bits per second of the serial link. agetty will support multiple values, using the modem's CONNECT message or the RS-232 Break signal to select between them. Only use one value, as serial consoles only have only one data rate.
vt102 sets the TERM environment variable to indicate that a VT100 terminal is connecting.
-h activates CTS/RTS handshaking.
-t 60 allows 60 seconds for someone to attempt to log in before the modem is hung up.
agetty uses escape sequences in /etc/issue to insert information. For example, \n.\o \l will appear as remote.example.edu.au ttyS0.