will libvirt don't create vnetX tun device?

When I create the vm instance using libvirt, it will create a TUN device named vnetX. I wonder whether the libvirt don't create the vnet device, and I use other method to create it.

Event not found in sed

I tried the code as given on delete text between curly brackets

however I am facing this different error regarding event in sed.

file contains:

This is {
{the multiline
text} file }
that wants
{ to {be
changed}
} anyway.

sed ':again;$!N;$!b again; s/{[^}]*}//g' file

what is supposively going wrong in the workout?

Mounting synology disks in ubuntu

I have some files on synology disk that I would like to recover with extundelete. I have mounted the raid1 setup. So on the disk is two raid storages (md2 and md3) and they are connected to one with lvm. I try to get the lvm going. I think it doesn't like the md2p1. I tried to mount md2p1, but it doesn't mount, so I thnik it's some garbage. How could I make that work that LVM would find the other device?

sudo lsblk -o name,uuid,mountpoint
NAME        UUID                                   MOUNTPOINT
sda                                                
├─sda1      bb4b1f59-9349-4e59-cced-5de7ca715931   
├─sda2      291dec99-01d5-7031-cced-5de7ca715931   
├─sda5      46288321-39d3-353d-7014-c3a9333d1c33   
│ └─md2     8s9LfU-Egt2-sbtJ-1zkH-ewqb-LjRT-xZ2RC2 
│   └─md2p1 8da77aa4-43ff-4cd1-81f0-f311284e0b04   
└─sda6      a7ff03a3-29c2-a100-ecdd-c31c151ca783   
  └─md3     Eu0fsK-Cu1W-3PCw-ZEV6-80fL-05rf-H0qlcE 
sdb                                                
├─sdb1      e29faa0c-a7b4-4851-a17d-75c20238edc2   /
├─sdb2      ce06f4bb-5f73-423b-9794-b94a1e47d4f8   
└─sdb3      6089A7F658D702D4                       
sdc                                                
└─sdc1      09d3c590-3a6a-4436-8718-7c14ab0e282b 

sudo lvs
 Couldn't find device with uuid 8s9LfU-Egt2-sbtJ-1zkH-ewqb-LjRT-xZ2RC2.
LV   VG     Attr      LSize Pool Origin Data%  Move Log Copy%  Convert
lv   vg1000 -wi-----p 2,72t

Route specificity vs metric

I understand that Linux chooses the most specific route to the destination when it does routing selection. But what about a route's metric? Does it have a higher priority than route's specificity?

A reference to the details of the routing selection algorithm would also be appreciated.

How to copy a whole directory structure with a certain file size limit?

For some reasons, I need to do a data clone.

In which I need to copy the whole structure of a huge directory, but I'd like to only copy those files which are smaller than 1MB(with their hierarchy unchanged), because there are many giant temp files I want to avoid clone with.

Which utilities or commands I should use to achieve that goal?

Does zip command can realize this goal directly?

Remove tar compress spool from cron email

I have a crontab job that call a simple script to backup a website:

15 0 1,10,20 * * /home/username/bin/backup_whatever

This is the script:

#!/bin/bash
TODAY=$(date +"%Y%m%d")
FILE_TO_PUT="filename.$TODAY.tar.gz"
rm -rf /home/username/filename.tar.gz
tar -zcvf /home/username/filename.tar.gz -C / var/www/website/
s3cmd put /home/username/filename.tar.gz s3://s3bucket/backups/$FILE_TO_PUT

As the tar command compress lots of files, the email I got when this is executed is really huge. How can I do to just display a message like compression successfully instead the full output of tar command?

Will be ok, if I do something like this? Can't find out the tar return codes.

EXITCODE=$(tar -zcvf /home/username/filename.tar.gz -C / var/www/website/)
if [ $EXITCODE -eq 0]
then
    echo "compression successfully"
else
    echo "compression unsuccessfully"
fi

Run itext script as cups filter

I have an itext script to apply some customisations to pdf files. These need to be done on-the-fly.

I can easily do it this way :

java -cp ".:itext5.jar" pdflayout input.pdf | lpr -P CP800/print

But would rather set up some shareable cups queue that would run the script, so that our graphics people can print to it directly.

Can anyone point me in the right direction?

O/S is Debian Sqeeze.