flush dns cache
http://www.cyberciti.biz/faq/rhel-debian-ubuntu-flush-clear-dns-cache/

vim tips:
tab to spacekey

:set tabstop=4
:set shiftwidth=4
:set expandtab

git svn
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1. Install svn, git svn, bala bala
git svn needs svn-perl module, which is included in svn 1.6 and above. So you need install svn 1.6 and svn-perl module, pls refer to the reference:
To be sure, all your installed libraries are updated in ldconfig
[Update:] If failed to git svm dcommit, with the error "Term::ReadKey...", install perl-termreadkey
2. Howto:
Still looking at it