On Wed, 29 May 2002, GIC MLs wrote:
> # dd if=/dev/nrsa0 bs=32k skip=1 | /usr/local/bin/gtar -xf usr.dump
>
> ... but I get:
>
> /usr/local/bin/gtar: usr.dump: Cannot open: (null)
> /usr/local/bin/gtar: Error is not recoverable: exiting now
>
> What am I doing wrong here? Am I using the gtar command incorrectly?
> I read through the tar manpage trying to find my mistake, but can't seem to
> see what I'm doing wrong.
Yeah, it's right here in the SYNOPSIS section of the man page:
SYNOPSIS
tar [ - ] A --catenate --concatenate | c --create | d
--diff --compare | r --append | t --list | u --update | x
-extract --get [ --atime-preserve ] [ -b, --block-size N ]
[ -B, --read-full-blocks ] [ -C, --directory DIR ] [
--checkpoint ] [ -f, --file [HOSTNAME:]F ] [ --force-
local ] [ -F, --info-script F --new-volume-script F ] [
-G, --incremental ] [ -g, --listed-incremental F ] [ -h,
--dereference ] [ -i, --ignore-zeros ] [ -I, --bzip ] [
--ignore-failed-read ] [ -k, --keep-old-files ] [ -K,
--starting-file F ] [ -l, --one-file-system ] [ -L,
--tape-length N ] [ -m, --modification-time ] [ -M,
--multi-volume ] [ -N, --after-date DATE, --newer DATE ] [
-o, --old-archive, --portability ] [ -O, --to-stdout ] [
-p, --same-permissions, --preserve-permissions ] [ -P,
--absolute-paths ] [ --preserve ] [ -R, --record-num�
ber ] [ --remove-files ] [ -s, --same-order, --preserve-
order ] [ --same-owner ] [ -S, --sparse ] [ -T, --files-
from F ] [ --null ] [ --totals ] [ -v, --verbose ] [
-V, --label NAME ] [ --version ] [ -w, --interactive,
--confirmation ] [ -W, --verify ] [ --exclude FILE ] [
-X, --exclude-from FILE ] [ -Z, --compress, --uncompress ]
[ -z, --gzip, --ungzip ] [ --use-compress-program
PROG ] [ --block-compress ] [ -[0-7][lmh] ]
filename1 [ filename2, ... filenameN ]
directory1 [ directory2, ...directoryN ]
Ok, see it now? (Neither do I :-) But you need a - after the -xf,
otherwise tar is trying to read its input from usr.dump, which it can't
find. a - after the -f option says to read from stdin. So try changing
that to read:
# dd if=/dev/nrsa0 bs=32k skip=1 | /usr/local/bin/gtar -xf - usr.dump
and let us know how it goes.
-Mitch
