Section (1) tty
tty — print the file name of the terminal connected to standard input
Print the file name of the terminal connected to standard input.
print nothing, only return an exit status
display this help and exit
output version information and exit
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Section (4) tty
tty — controlling terminal
/dev/tty is a
character file with major number 5 and minor number 0,
usually with mode 0666 and ownership root:tty. It is a
synonym for the controlling terminal of a process, if
Detach the calling process from its controlling terminal.
If the process is the session leader, then
SIGCONT signals are sent to the
foreground process group and all processes in the current
session lose their controlling tty.
This ioctl(2) call works only
on file descriptors connected to
/dev/tty. It is used by daemon processes
when they are invoked by a user at a terminal. The process
attempts to open
the open succeeds, it detaches itself from the terminal by
TIOCNOTTY, while if the
open fails, it is obviously not attached to a terminal and
does not need to detach itself.
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Copyright (c) 1993 Michael Haardt (michaelmoria.de),
Fri Apr 2 11:32:09 MET DST 1993
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Modified 1993-07-24 by Rik Faith (faithcs.unc.edu)
Modified 2003-04-07 by Michael Kerrisk