stty -a

[jerry1]

Can someone tell me why I have stty susp on this one system. I cannot do a ^z to background processes unless I set it myself.
I thought this was set by default.

The other systems have susp = ^Z after login.
Checked all source files for login.
root using /sbin/sh.

HP-UX 11.0.

[Sridhar Bhaskarla · Accepted solution]

Hi,

There are may be quite a few reasons why it got changed. One is a previous reset of these options by redirecting the stdin to /dev/ttyconf.

You can set it back by redirecting stdin to the device /dev/ttyconf

For ex., you would set susp to ^Z by

stty susp ^Z < /dev/ttyconf

From next login onwards, it will set the suspend character to ^Z.

-Sri

[Paddy_1]

Did you look at /etc/profile ?
If so has it recently changed.

Check for .profile entries like this
---------------
stty susp ^z
stty intr ^c
stty eof ^d
----------

The simple solution is to add these to your shell startup profile wherever it is.

[jerry1]

It works. That is cool. How does that work exactly.

stty susp ^Z < /dev/ttyconf

[A. Clay Stephenson]

The answer to that lies in the stty man pages. Look under "Control Character Default Assignments". Note that this device can only be accessed by root. The /dev/tty device is YOUR terminal device no matter what you are physically connected to. It saves you the trouble of having to determine the actual port in use.

[Sridhar Bhaskarla]

Hi,

Look at the man page for more information. Particularly

//The default values for the control characters may be changed by a user
with root capability by using stty and redirecting stdin to the device
/dev/ttyconf//

See one of the examples given also.

There was a bug with make_sys_image (run by make_tape_recovery/make_net_recovery) that it was modifying the defaults for /dev/ttyconf. Yours could have been this case.

-Sri

[Bill Hassell]

I always have the following in /etc/profile:

if tty -s
then
eval $(ttytype -s)
stty erase "^H" kill "^U" intr "^C" eof "^D" -parity ixoff
stty susp \^Z dsusp \^Y
fi

The above code figures out your terminal type (only when /etc/profile is run from an interactive session) and sets the most important stty values for your terminal session. /dev/ttyconf is a global device file used to set permanent stty values, for example, to make backspace work during login.