OS: SCO Osr 5.0.7 with Maintenance Pack 5

I'm trying to,write a Bourne script that I can use to backup files. I hope
to redirect cpio's verbose output to a file, for later comparison with an
earlier file that contains the filenames that I wish to backup. In the
following script, cpio send its verbose outrput to the console, instead of
to the file named "backnames". Can anyone tell me why?

TIA,
Arby

# Remove backup status file
echo Bad Backup > /tmp/backup_status
echo > Daily
echo Daily > backnames
find /usr/myapp/db/* -depth -print >> backnames
echo "User requested a Daily backup." > /tmp/backnames

# Perform the backup
# Increased block i/o size from 1024 to 64 kB and media size to 79 GB: RB

cat backnames | cpio -ocaBv -C65536 -O/dev/mt \
-K7990000 > /tmp/backnames

# -K7990000 \
# -M "Please insert tape %d and then press RETURN: " > /tmp/backnames


# Compare /tmp/backnames to backnames. If a good backup, they'll match.
# (excluding media errors, of course.)
. . . etc

On Sun, Oct 07, 2007, Arby wrote:
>OS: SCO Osr 5.0.7 with Maintenance Pack 5
>
>I'm trying to,write a Bourne script that I can use to backup files. I hope
>to redirect cpio's verbose output to a file, for later comparison with an
>earlier file that contains the filenames that I wish to backup. In the
>following script, cpio send its verbose outrput to the console, instead of
>to the file named "backnames". Can anyone tell me why?

Most likely because the output is to standard error, not standard output.

>cat backnames | cpio -ocaBv -C65536 -O/dev/mt \
>-K7990000 > /tmp/backnames

This would be self-destructive as the command would empty
/tmp/backnames on startup, and could also be considered an
example of useless use of the cat command

Should be:

cpio -ocaBv -C65536 -O/dev/mt -K7990000 < /tmp/backnames > /tmp/cpioout 2>&1

The part ``2>&1'' joins standard output and standard error into a
single file stream.

Bill
--
INTERNET: bill@celestial.com Bill Campbell; Celestial Software LLC
URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way
FAX: (206) 232-9186 Mercer Island, WA 98040-0820; (206) 236-1676

What's this script do?
unzip ; touch ; finger ; mount ; gasp ; yes ; umount ; sleep
Hint for the answer: not everything is computer-oriented. Sometimes you're
in a sleeping bag, camping out.
(Contributed by Frans van der Zande.)