Unix Tip #4453- May 21, 2013


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Tru64 STTY DEC


On Tru64 Unix (at least on 4.0F),
some non-root-user drop an error
message on the root's Mail
account when cronjobs used

su - foo -c /usr/bin/bar

Even some Compaq technicians could
not tell that this results from
terminal settings in the .profile,
which are invalid on non-interactive
terminals. The error messages
(2 in fact) looks like this:

stty: tcgetattr: not a typewriter
Not a terminal.

The solution is to wrap commands
like "stty dec" and "tset -I -Q"
with a check on terminal capabilities:

if tty -s
then
stty dec
tset -I -Q
fi


This tip generously supported by: nils@poppendiek.de

NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted by various unix admins around the globe. UGU suggest you read and test each tip in a non-volitile environment before placing into production.


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