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Top Forums UNIX for Advanced & Expert Users calling a Universe program Post 302290262 by botao on Sunday 22nd of February 2009 08:20:07 PM
Old 02-22-2009
ya2c (yet another 2 cents)

my 2 cents are about /dev/tty and nohup :

- first, you should consider that some applications "like" (*) to open "/dev/tty" ;

- the simplest test you should perform is to force you command to use "/dev/tty" and see if it satisfies your application ;

- speciffically, if you run a shell script in this fashion :

Code:
$ somescript.sh < /dev/tty > /dev/tty

- then your script should not complain about "tty output"

(*) they really shouldn't ; it's poor programming practice .

- second, nohup has 2 relevant properties :

-- it can't afford /dev/tty communication ;

-- it ignores ".profile" sourcing ;

- those two peculiarities above are responsible for most script execution misfortunes ;

- so if you need to run a script thru nohup, be sure to source your ".profile" explicitly within its first few lines ;

good luck, and success !

alexandre botao
 

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TTY(4)							     Linux Programmer's Manual							    TTY(4)

NAME
tty - controlling terminal DESCRIPTION
The file /dev/tty is a character file with major number 5 and minor number 0, usually of mode 0666 and owner.group root.tty. It is a syn- onym for the controlling terminal of a process, if any. In addition to the ioctl(2) requests supported by the device that tty refers to, the ioctl(2) request TIOCNOTTY is supported. TIOCNOTTY Detach the calling process from its controlling terminal. If the process is the session leader, then SIGHUP and SIGCONT signals are sent to the foreground process group and all processes in the current session lose their controlling tty. This ioctl(2) call only works 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 /dev/tty. If the open succeeds, it detaches itself from the terminal by using TIOCNOTTY, while if the open fails, it is obviously not attached to a terminal and does not need to detach itself. FILES
/dev/tty SEE ALSO
chown(1), mknod(1), ioctl(2), termios(3), console(4), tty_ioctl(4), ttyS(4), agetty(8), mingetty(8) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2003-04-07 TTY(4)
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