to look at the file C<daemon/debug.c> in the libguestfs source
to find out what you can do.
+=head2 df
+
+ df
+
+This command runs the C<df> command to report disk space used.
+
+This command is mostly useful for interactive sessions. It
+is I<not> intended that you try to parse the output string.
+Use C<statvfs> from programs.
+
+=head2 df-h
+
+ df-h
+
+This command runs the C<df -h> command to report disk space used
+in human-readable format.
+
+This command is mostly useful for interactive sessions. It
+is I<not> intended that you try to parse the output string.
+Use C<statvfs> from programs.
+
=head2 dmesg
dmesg
This automatically calls L<sync(2)> before the operation,
so that the maximum guest memory is freed.
+=head2 du
+
+ du path
+
+This command runs the C<du -s> command to estimate file space
+usage for C<path>.
+
+C<path> can be a file or a directory. If C<path> is a directory
+then the estimate includes the contents of the directory and all
+subdirectories (recursively).
+
+The result is the estimated size in I<kilobytes>
+(ie. units of 1024 bytes).
+
=head2 e2fsck-f
e2fsck-f device
This command installs GRUB (the Grand Unified Bootloader) on
C<device>, with the root directory being C<root>.
+=head2 head
+
+ head path
+
+This command returns up to the first 10 lines of a file as
+a list of strings.
+
+Because of the message protocol, there is a transfer limit
+of somewhere between 2MB and 4MB. To transfer large files you should use
+FTP.
+
+=head2 head-n
+
+ head-n nrlines path
+
+If the parameter C<nrlines> is a positive number, this returns the first
+C<nrlines> lines of the file C<path>.
+
+If the parameter C<nrlines> is a negative number, this returns lines
+from the file C<path>, excluding the last C<nrlines> lines.
+
+If the parameter C<nrlines> is zero, this returns an empty list.
+
+Because of the message protocol, there is a transfer limit
+of somewhere between 2MB and 4MB. To transfer large files you should use
+FTP.
+
=head2 hexdump
hexdump path
of somewhere between 2MB and 4MB. To transfer large files you should use
FTP.
+=head2 initrd-list
+
+ initrd-list path
+
+This command lists out files contained in an initrd.
+
+The files are listed without any initial C</> character. The
+files are listed in the order they appear (not necessarily
+alphabetical). Directory names are listed as separate items.
+
+Old Linux kernels (2.4 and earlier) used a compressed ext2
+filesystem as initrd. We I<only> support the newer initramfs
+format (compressed cpio files).
+
=head2 is-busy
is-busy
The filesystem options C<sync> and C<noatime> are set with this
call, in order to improve reliability.
+=head2 mount-loop
+
+ mount-loop file mountpoint
+
+This command lets you mount C<file> (a filesystem image
+in a file) on a mount point. It is entirely equivalent to
+the command C<mount -o loop file mountpoint>.
+
=head2 mount-options
mount-options options device mountpoint
=head2 sfdisk-N
- sfdisk-N device n cyls heads sectors line
+ sfdisk-N device partnum cyls heads sectors line
This runs L<sfdisk(8)> option to modify just the single
partition C<n> (note: C<n> counts from 1).
You should always call this if you have modified a disk image, before
closing the handle.
+=head2 tail
+
+ tail path
+
+This command returns up to the last 10 lines of a file as
+a list of strings.
+
+Because of the message protocol, there is a transfer limit
+of somewhere between 2MB and 4MB. To transfer large files you should use
+FTP.
+
+=head2 tail-n
+
+ tail-n nrlines path
+
+If the parameter C<nrlines> is a positive number, this returns the last
+C<nrlines> lines of the file C<path>.
+
+If the parameter C<nrlines> is a negative number, this returns lines
+from the file C<path>, starting with the C<-nrlines>th line.
+
+If the parameter C<nrlines> is zero, this returns an empty list.
+
+Because of the message protocol, there is a transfer limit
+of somewhere between 2MB and 4MB. To transfer large files you should use
+FTP.
+
=head2 tar-in
tar-in (tarfile|-) directory
List all the volumes groups detected. This is the equivalent
of the L<vgs(8)> command. The "full" version includes all fields.
+=head2 wc-c
+
+ wc-c path
+
+This command counts the characters in a file, using the
+C<wc -c> external command.
+
+=head2 wc-l
+
+ wc-l path
+
+This command counts the lines in a file, using the
+C<wc -l> external command.
+
+=head2 wc-w
+
+ wc-w path
+
+This command counts the words in a file, using the
+C<wc -w> external command.
+
=head2 write-file
write-file path content size