topic Shell programming in Operating System - HP-UX

Shell programming

Kerry_1 — Mon, 18 Feb 2002 05:25:27 GMT

Hi everybody
I have written the script on hp-ux 10.20, which includes "tar cvf" command. This script is started by cron using the string which redirects stdout to "> /dev/pts/0"-everything to X-terminal of CDE. Everything is OK but tar command doesn't stdout anything.So how can I stdout the protocol of tar command to /dev/pts/0 ?
Thank you.

Re: Shell programming

Sanjay_6 — Mon, 18 Feb 2002 05:30:37 GMT

Hi Kerry,

/dev/pts/0 is assigned dynamically to the terminal which connects to the system. so when you try to redirect the output of the tar command to /dev/pts/0 there should be someone connected to the system using the port /dev/pts/0.

Normally we redirect output of the commands to a file, that makes it easy to keep track of any errors.

Hope this helps.

regds

Re: Shell programming

Deepak Extross — Mon, 18 Feb 2002 05:53:54 GMT

Kerry,
Remember that tar spews it "output" onto stderr, not stdout.
You may want to try redirecting the standard error (2) instead of standard output (1)

Hope this helps.

Re: Shell programming

Peter Kloetgen — Mon, 18 Feb 2002 08:20:01 GMT

Hi Kerry,

The standard out of tar is channel 2 (normally standard error), so try the following:

script_name >/dev/pts/0 2&>1

using this way, you first redirect the output of all other commands to standard output, and the output of the tar- command is also redirected to the same terminal.

Allways stay on the bright side of life!

Peter

Re: Shell programming

Steven Sim Kok Leong — Mon, 18 Feb 2002 08:26:19 GMT

Hi Peter,

No offence but I think there is a small typo in your response. It should be:

script_name >/dev/pts/0 2>&1

Hope this helps. Regards.

Steven Sim Kok Leong