Howto on creating local repo:
sudo mkdir /var/my-local-repo
sudo dpkg-scanpackages  /var/my-local-repo /dev/null > /var/my-local-repo/Packages
echo "deb file:/var/my-local-repo ./" > /tmp/my-local.list
sudo mv /tmp/my-local.list /etc/apt/sources.list.d/my-local.list
sudo apt-get update

Verbose kernel compile output in openwrt:

include/kernel-build.mk:
KERNEL_MAKEOPTS V=1

Log in to remote systems without password:

cat .ssh/id_rsa.pub
[copy]
log in to remote system
mkdir .ssh
chmod 700 .ssh
cat >> .ssh/authorized_keys2
[paste]
Ctrl+D

Brasero in squeeze doesn't correctly write archives to CD/DVD. Workaround:

genisoimage -o all.iso all.tar

Browser proxy settings to use tor on openwrt:

SOCKS proxy: 192.168.1.1:9050

Split one multi-patch file into many files, one file per patch (file paths in patch must not use spaces):

perl -ne 'BEGIN{$c=1}if(m!diff -urN.* [^/]+/(.*)!){($x=$1)=~s!/!_!g;close F;open F,">",sprintf("%03d-",$c).$x.".patch";$c++}print F' mult-patch-filename.patch

In git, if part of a file is staged and part is unstaged, commit only staged changes:

cp file file.unstaged 
git co file 
git ci file 
mv file.unstaged file