dump and restore from cron

[Jeffrey Kays]

Problem at hand:

I am trying to dump my root partition to another disk partition
via cron. I execute a shell script that runs the command:

dump 0f - / | (cd /mnt; restore xf -)

This command works fine when I do it from the shell. But when it
runs from cron, I get this output:

open("/dev/tty"): No such device or address
  DUMP: Date of this level 0 dump: Wed Nov 21 08:19:05 1990
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rrz2a (/) to standard output
  DUMP: Mapping (Pass I) [regular files]
  DUMP: Mapping (Pass II) [directories]

  DUMP: Estimated 9127936 bytes output to Standard Output

  DUMP: Dumping (Pass III) [directories]
  DUMP: Child 3278 returns LOB status 15
  DUMP: Bad return code from dump: 0


What DEC tells me is that I can't do this because dump and restore
want to open /dev/tty, and since this is running from cron, there
is no associated terminal. But I know it's not dump, because I'm
using it in other places to dump out partitions to tape. And if I
do something like this from my script:

dump 0f /tmp/root.dump /
cd /mnt
restore xf /tmp/root.dump

it works. So why can't I use dump and restore in a pipe??

I'm running Ultrix 3.1 (Worksystem V2.1) on a DECstation 3100.
Any ideas would be *greatly* appreciated!!

  jeff


-- 

Jeff Kays				E-Mail: jkays at msc.edu
Minnesota Supercomputer Center		 Phone: (612) 626-1824
Minneapolis, Minnesota			   Fax: (612) 624-6550

		"May fortune favor the foolish"