07-25-2011
Purpose of - (hypen) in script or command line
Hi,
I am new for unix and I am following ABS guide. What is the purpose of - (hypen ) in the below command and What it will do in this?. Can anyone explain it in detail. Rest of the things in the below command I understood somewhat.
(cd /source/directory && tar cf - . ) | (cd /dest/directory && tar xpvf -)
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LEARN ABOUT DEBIAN
virt-tar-in
virt-tar-in(1) Virtualization Support virt-tar-in(1)
NAME
virt-tar-in - Unpack a tarball into a virtual machine disk image.
SYNOPSIS
virt-tar-in -a disk.img data.tar /destination
virt-tar-in -d domain data.tar /destination
zcat data.tar.gz | virt-tar-in -d domain - /destination
WARNING
Using "virt-tar-in" on live virtual machines can be dangerous, potentially causing disk corruption. The virtual machine must be shut down
before you use this command.
DESCRIPTION
"virt-tar-in" unpacks an uncompressed tarball into a virtual machine disk image or named libvirt domain.
The first parameter is the tar file. Use "-" to read the tar file from standard input. The second parameter is the absolute target
directory to unpack into.
EXAMPLES
Upload a home directory to a guest:
virt-tar-in -d MyGuest homes.tar /home
JUST A SHELL SCRIPT WRAPPER AROUND GUESTFISH
This command is just a simple shell script wrapper around the guestfish(1) "tar-in" command. For anything more complex than a trivial
copy, you are probably better off using guestfish directly.
OPTIONS
Since the shell script just passes options straight to guestfish, read guestfish(1) to see the full list of options.
SEE ALSO
guestfish(1), virt-cat(1), virt-copy-in(1), virt-copy-out(1), virt-edit(1), virt-make-fs(1), virt-tar-out(1), <http://libguestfs.org/>.
AUTHORS
Richard W.M. Jones ("rjones at redhat dot com")
COPYRIGHT
Copyright (C) 2011 Red Hat Inc. <http://libguestfs.org/>
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
libguestfs-1.18.1 2013-12-07 virt-tar-in(1)