TTYS(5) File Formats Manual TTYS(5)
ttys - terminal initialization data
The ttys file is read by the init program and specifies which terminal
special files are to have a process created for them so that people can
log in. There is one line in the ttys file per special file.
The first character of a line in the ttys file is either `0' or `1'.
If the first character on the line is a `0', the init program ignores
that line. If the first character on the line is a `1', the init pro-
gram creates a login process for that line. The second character on
each line is used as an argument to getty(8), which performs such tasks
as baud-rate recognition, reading the login name, and calling login.
For normal lines, the character is `0'; other characters can be used,
for example, with hard-wired terminals where speed recognition is
unnecessary or which have special characteristics. (Getty will have to
be fixed in such cases.) The remainder of the line is the terminal's
entry in the device directory, /dev.
gettytab(5), init(8), getty(8), login(1)
18 July 1983 TTYS(5)