Provided by: guestfs-tools_1.48.2-1ubuntu1_amd64

#### NAME

       virt-cat - Display files in a virtual machine



#### SYNOPSIS

        virt-cat [--options] -d domname file [file ...]

virt-cat [--options] -a disk.img [-a disk.img ...] file [file ...]

Old-style:

virt-cat domname file

virt-cat disk.img file



#### DESCRIPTION

       "virt-cat" is a command line tool to display the contents of "file" where "file" exists in
the named virtual machine (or disk image).

Multiple filenames can be given, in which case they are concatenated together.  Each
filename must be a full path, starting at the root directory (starting with '/').

"virt-cat" can be used to quickly view a file.  To edit a file, use "virt-edit".  For more
complex cases you should look at the guestfish(1) tool (see "USING GUESTFISH" below).



#### EXAMPLES

       Display /etc/fstab file from inside the libvirt VM called "mydomain":

virt-cat -d mydomain /etc/fstab

Find out what packages were recently installed:

virt-cat -d mydomain /var/log/yum.log | tail

Find out who is logged on inside a virtual machine:

virt-cat -d mydomain /var/run/utmp > /tmp/utmp
who /tmp/utmp

or who was logged on:

virt-cat -d mydomain /var/log/wtmp > /tmp/wtmp
last -f /tmp/wtmp



#### OPTIONS

       --help
Display brief help.

-a file
Add file which should be a disk image from a virtual machine.  If the virtual machine
has multiple block devices, you must supply all of them with separate -a options.

The format of the disk image is auto-detected.  To override this and force a
particular format use the --format=.. option.

-a URI

--blocksize=512
--blocksize=4096
--blocksize
This parameter sets the sector size of the disk image.  It affects all explicitly
added subsequent disks after this parameter.  Using --blocksize with no argument
switches the disk sector size to the default value which is usually 512 bytes.  See

-c URI
--connect URI
If using libvirt, connect to the given URI.  If omitted, then we connect to the
default libvirt hypervisor.

If you specify guest block devices directly (-a), then libvirt is not used at all.

-d guest
--domain guest
Add all the disks from the named libvirt guest.  Domain UUIDs can be used instead of
names.

--echo-keys
When prompting for keys and passphrases, virt-cat normally turns echoing off so you
cannot see what you are typing.  If you are not worried about Tempest attacks and
there is no one else in the room you can specify this flag to see what you are typing.

--format=raw|qcow2|..
--format
The default for the -a option is to auto-detect the format of the disk image.  Using
this forces the disk format for -a options which follow on the command line.  Using
--format with no argument switches back to auto-detection for subsequent -a options.

For example:

virt-cat --format=raw -a disk.img file

forces raw format (no auto-detection) for disk.img.

virt-cat --format=raw -a disk.img --format -a another.img file

forces raw format (no auto-detection) for disk.img and reverts to auto-detection for
another.img.

If you have untrusted raw-format guest disk images, you should use this option to
specify the disk format.  This avoids a possible security problem with malicious
guests (CVE-2010-3851).

--key SELECTOR
Specify a key for LUKS, to automatically open a LUKS device when using the inspection.
"ID" can be either the libguestfs device name, or the UUID of the LUKS device.

--key "ID":key:KEY_STRING
Use the specified "KEY_STRING" as passphrase.

--key "ID":file:FILENAME

--keys-from-stdin
Read key or passphrase parameters from stdin.  The default is to try to read
passphrases from the user by opening /dev/tty.

If there are multiple encrypted devices then you may need to supply multiple keys on
stdin, one per line.

-m dev[:mountpoint[:options[:fstype]]]
--mount dev[:mountpoint[:options[:fstype]]]
Mount the named partition or logical volume on the given mountpoint.

If the mountpoint is omitted, it defaults to /.

Specifying any mountpoint disables the inspection of the guest and the mount of its
root and all of its mountpoints, so make sure to mount all the mountpoints needed to
work with the filenames given as arguments.

If you don’t know what filesystems a disk image contains, you can either run guestfish
without this option, then list the partitions, filesystems and LVs available (see
"list-partitions", "list-filesystems" and "lvs" commands), or you can use the
virt-filesystems(1) program.

The third (and rarely used) part of the mount parameter is the list of mount options
used to mount the underlying filesystem.  If this is not given, then the mount options
are either the empty string or "ro" (the latter if the --ro flag is used).  By
specifying the mount options, you override this default choice.  Probably the only
time you would use this is to enable ACLs and/or extended attributes if the filesystem
can support them:

-m /dev/sda1:/:acl,user_xattr

Using this flag is equivalent to using the "mount-options" command.

The fourth part of the parameter is the filesystem driver to use, such as "ext3" or
"ntfs". This is rarely needed, but can be useful if multiple drivers are valid for a
filesystem (eg: "ext2" and "ext3"), or if libguestfs misidentifies a filesystem.

-v
--verbose
Enable verbose messages for debugging.

-V
--version
Display version number and exit.

-x  Enable tracing of libguestfs API calls.



#### OLD-STYLECOMMANDLINEARGUMENTS

       Previous versions of virt-cat allowed you to write either:

virt-cat disk.img [disk.img ...] file

or

virt-cat guestname file

whereas in this version you should use -a or -d respectively to avoid the confusing case
where a disk image might have the same name as a guest.

For compatibility the old style is still supported.



#### LOGFILES

       To list out the log files from guests, see the related tool virt-log(1).  It understands
binary log formats such as the systemd journal.

To follow (tail) text log files, use virt-tail(1).



#### WINDOWSPATHS

       "virt-cat" has a limited ability to understand Windows drive letters and paths (eg.
E:\foo\bar.txt).

If and only if the guest is running Windows then:

•   Drive letter prefixes like "C:" are resolved against the Windows Registry to the
correct filesystem.

•   Any backslash ("\") characters in the path are replaced with forward slashes so that
libguestfs can process it.

•   The path is resolved case insensitively to locate the file that should be displayed.

There are some known shortcomings:

•   Some NTFS symbolic links may not be followed correctly.

•   NTFS junction points that cross filesystems are not followed.



#### USINGGUESTFISH

       guestfish(1) is a more powerful, lower level tool which you can use when "virt-cat"
doesn't work.

Using "virt-cat" is approximately equivalent to doing:

where "domname" is the name of the libvirt guest, and "file" is the full path to the file.
Note the final "-" (meaning "output to stdout").

The command above uses libguestfs’s guest inspection feature and so does not work on
guests that libguestfs cannot inspect, or on things like arbitrary disk images that don't
contain guests.  To display a file from a disk image directly, use:

where disk.img is the disk image, /dev/sda1 is the filesystem within the disk image, and
"file" is the full path to the file.



#### EXITSTATUS

       This program returns 0 if successful, or non-zero if there was an error.



#### SEEALSO

       guestfs(3), guestfish(1), virt-copy-out(1), virt-edit(1), virt-log(1), virt-tail(1),
virt-tar-out(1), http://libguestfs.org/.



#### AUTHOR

       Richard W.M. Jones http://people.redhat.com/~rjones/



       Copyright (C) 2010-2012 Red Hat Inc.



       This program is free software; you can redistribute it and/or modify it under the terms of
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.



#### BUGS

       To get a list of bugs against libguestfs, use this link:
https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools

To report a new bug against libguestfs, use this link:
https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools

When reporting a bug, please supply:

•   The version of libguestfs.

•   Where you got libguestfs (eg. which Linux distro, compiled from source, etc)

•   Describe the bug accurately and give a way to reproduce it.

•   Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug
report.