Show installed packages sorted by disc usage 
dpkg-query --show --showformat='${Installed-Size}\t${Package}\t${Status}\n' | grep -v deinstall | sort -nr | less

adapted from Martins Blog

Clear dpkg status file

dpkg-Status sorted:
grep Status /var/lib/dpkg/status|sort|uniq -c

purge rc packages:
dpkg -P $(dpkg -l \*|grep ^rc|awk '{print $2}')

purge for other status:
grep -B 2 'deinstall ok config-files' /var/lib/dpkg/status|sed /^$/d |grep Package|awk '{print $2}'

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apt-get on many hosts with clusterssh 
Clusterssh opens for each connection a xterm and sends a keystroke to each window.

You can also work in only one xterm.

#> apt-get install clusterssh

I use approxd for caching .deb's using port 9999. This port is not reachable by all my hosts,
therefore i use remote port forwarding from ssh.

I can type

#> cssh -o "-R9999:approxy:9999" host1 host2 host3

or create a default config

#> cssh -u > $HOME/.csshrc

You can define different clusters aliases. Each alias consists of some hosts:
clusters = apt mon
apt = host1 host2 host3
ssh_args= -x -o ConnectTimeout=10 -R9999:approxy:9999
now i only type

#> cssh apt

a small patch makes "retile windows" working for me:

--- 2010-09-27 13:23:02.561375883 +0200
+++ /usr/share/perl5/App/ 2010-09-27 13:09:27.011375882 +0200
@@ -1319,7 +1319,7 @@
logmsg( 3,
"x:$current_x y:$current_y, r:$current_row c:$current_col" );

- $xdisplay->req( 'UnmapWindow', $servers{$server}{wid} );
+# $xdisplay->req( 'UnmapWindow', $servers{$server}{wid} );

if ( $config{unmap_on_redraw} =~ /yes/i ) {
$xdisplay->req( 'UnmapWindow', $servers{$server}{wid} );

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ubuntu 8.10 (intrepid ibex) troubles with an old Acer Travelmate 630 
I could not run the ubuntu live installcd and also the alternate hang sometimes. After a successful install X freezes. I tried to boot with various boot options. Only with acpi=off my system seams to working but with fan running and no battery info. An older knoppix was running, so i decided to install older ubuntu kernels and saw my system running with a gutsy kernel (2.6.22) but not with a hardy kernel (2.6.24).

What changed inside the kernel?

After searching a lot i found pci=nommconf.

It seams that something in the way pci is configured has changed.

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script to rescue/backup a raid1 system and restore from a cd with initramfs 
Searching for a rescue system that creates a bootable CD to restore my system i found mkcdrec. Because sometimes things (mkcdrec/debian/ubuntu) changes and i had to test and patch for new mkcdrec versions, so i droped it.

Then i started to make a live CD with debian-live and make my install script by myself. I also dropped it (long boottime and had too much to hack to let it work like i wanted).

Now i had the idea to build my own script that tar's my system and builds a bootable cd. I liked the idea of initramfs to extend it like i will and it boots much faster. The only drawback is that all things are hardcoded and have to be changed for every system i backup. But its only a single script: Read More...

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block ssh brute force attacs / prevent synflooding 
With iptables module recent you can limit the count of tcp connection attempts. In my case i allow only 3 ssh connection attempts per minute. This stops script kiddies doing ssh brute force attacs.
iptables -N synflood
iptables -A synflood -p tcp --dport ssh -m recent --set --name SSH
iptables -A synflood -p tcp --dport ssh -m recent --update \
--seconds 60 --hitcount 4 --name SSH -j DROP

iptables -A INPUT -p tcp -m state --state NEW -j synflood
iptables -A FORWARD -i $OUT -p tcp -m state --state NEW -j synflood

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