secure rsync to only one directory 
I want to rsync to a remote host to a given directory.

ssh-keygen -t rsa
keyfilename: ~/.ssh/rsync
ssh-copy-id -i .ssh/rsync rsyncuser@remote-host

rsync files with ssh:
rsync -vaHxr --delete \
-e "ssh -i ~/.ssh/rsync -c arcfour -o Compression=no -x" \
LOCALDIR rsyncuser@remote-host:


ssh-dss 012345678...
limit access with from (optional).
On sucessfully ssh login command is executed.

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ffmpeg http Transfer-Encoding: chunked 
Today i a made a patch for ffmpeg to be able to fetch a png file from a cgi script

ffmpeg -f image2 -vcodec png -i 'http://server/cgi-bin/graph.cgi'

This didn't work because ffmpeg/libavformat/http could't handle "Transfer-Encoding: chunked"


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How to recompile / rebuild a debian package 
$ sudo apt-get install build-essential fakeroot dpkg-dev
$ mkdir build
$ cd build
$ sudo apt-get source foo
$ sudo apt-get build-dep foo
$ cd foo
$ dpkg-buildpackage -rfakeroot -b -us -uc -nc

-nc does not clean, usefull if you change something and rebuild ... y-package/

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run webalizer over existing (also compressed) logs 
LogFile /var/log/apache2/access.log.1
OutputDir /var/www/webalizer
Incremental yes
To have the right sorting order (oldest logs first) i use ls -tr.
for i in $(ls -tr access.log*); do \
webalizer -c /etc/webalizer/webalizer.conf $i; \

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ip crossover: send packets on eth0 out and receive them via eth1  
For testing my intellon driver on one pc i need to send packets on eth0 (intellon usb) out and receive them via eth1 (intellon ethernet).

The only solution i found was a not anymore supported module for netfilter from Rusty Russell.

I tried to fix the compiler errors/warnings and finally it worked.


ifconfig eth0
ifconfig eth1
arp -s <hardware address of eth1> -i eth0
arp -s <hardware address of eth0> -i eth1
modprobe ip_crossover dev1=eth0 dev2=eth1

Then doing ping, ICMP ping goes out eth0 and comes back in eth1.


for testing packets with differenz sizes i did:

for i in $(seq 0 1472); do ping -q -c1 -s$i >/dev/null || echo fail $i; done

for i in $(seq 0 1472); do ping -q -c1 -s$i >/dev/null || echo fail $i; done

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