topic Re: shell script question - redirect standard output in Operating System - HP-UX

shell script question - redirect standard output

Ridzuan Zakaria — Tue, 03 Dec 2002 18:23:03 GMT

Hi,

I am having the following problem in redirecting message to stdout.

Senario 1:
Here is my script and it works fine if I logged as user A and run the script.
----------------------------
TTY=`tty`

. /oracle/utils/orasid rendb

echo test start > $TTY

(sqlplus /nolog <connect system/manager
host echo hai > $TTY
exit
EOF
) > $HOME/sqllog.log

echo test finish > $TTY
---------------------------
The output is
-------------
test start
hai
test finish
------------

Senario 2:
But it doesn't work if I logged on as user A then change user to ' su - B' because my terminal device (tty) is own by user A.

Output:
/bin/sh: /dev/ttyp2: Cannot create the specified file.

Then I have tried to use file descriptor

exec 5>&1
. /oracle/utils/orasid rendb

echo test start >&5

(sqlplus /nolog <connect system/ora99dba
host echo hai >&5
exit
EOF
) > $HOME/sqllog.log

echo test finish >&5

Output:
test start
/bin/sh: /dev/ttyp2: Cannot create the specified file.
test finish.

With the above method and still having the problem to display message 'hai' in the sql block above.

The above script will be used in Senario 2. Does anyone know how to go about resolve the issue.

Thanks.

Re: shell script question - redirect standard output

harry d brown jr — Tue, 03 Dec 2002 18:26:10 GMT

REmove the redirection to $TTY

live free or die
harry

Re: shell script question - redirect standard output

harry d brown jr — Tue, 03 Dec 2002 18:34:45 GMT

You could also just redirect to /dev/tty

live free or die
harry

Re: shell script question - redirect standard output

.Olav Kappert. — Wed, 04 Dec 2002 18:28:48 GMT

You could also just redirect to /dev/tty

Instead of using $TTY, redirect the output to /dev/tty.

Good luck.
Olav Kappert

Re: shell script question - redirect standard output

Ridzuan Zakaria — Wed, 04 Dec 2002 18:31:09 GMT

Hi,

Thanks everyone for your feedback. I have changed my script to use /dev/tty.