Git, create new repository from subfolder

git clone --no-hardlinks repo_original new_repo;
cd new_repo
git filter-branch --subdirectory-filter subdir/you/want
git remote rm origin
git update-ref -d refs/original/refs/heads/master
git reflog expire --expire=now --all
git repack -ad


Edit incorrect commit

git commit --amend

Changing old commits:

git rebase --interactive $HASH

Creating n repositories at same time


for i in kernel filesystem bootloader application
do
mkdir /tmp/$i
cd /tmp/$i
git init
git remote add origin git@$SERVER:$i.git
touch README.$i
git add README.$i
git commit -a -m "First commit submodule $i"
git push origin master:refs/heads/master
done


Git rollback your repository to desirable commit


Locate your rollback point, it is a SHA1 hash

git log

Run:

git reset --hard SHA1_HASH , example:
git reset --hard 53f2445ee322b13668966049329929d2fdfe8adb


Maintaining Git

Ensuring good performance

On large repositories, git depends on compression to keep the history information from taking up too much space on disk or in memory.

This compression is not performed automatically. Therefore you should occasionally run git gc:

$ git gc

to recompress the archive. This can be very time-consuming, so you may prefer to run git-gc when you are not doing other work.
Ensuring reliability

The git fsck command runs a number of self-consistency checks on the repository, and reports on any problems. This may take some time. The most common warning by far is about “dangling” objects:

$ git fsck
dangling commit 7281251ddd2a61e38657c827739c57015671a6b3
dangling commit 2706a059f258c6b245f298dc4ff2ccd30ec21a63
dangling commit 13472b7c4b80851a1bc551779171dcb03655e9b5
dangling blob 218761f9d90712d37a9c5e36f406f92202db07eb
dangling commit bf093535a34a4d35731aa2bd90fe6b176302f14f
dangling commit 8e4bec7f2ddaa268bef999853c25755452100f8e
dangling tree d50bb86186bf27b681d25af89d3b5b68382e4085
dangling tree b24c2473f1fd3d91352a624795be026d64c8841f
…

Dangling objects are not a problem. At worst they may take up a little extra disk space. They can sometimes provide a last-resort method for recovering lost work.

Check original at http://book.git-scm.com/4_maintaining_git.html

Git clone SVN repository

git svn clone git@git-server:project.git
cd project
git remote add beanstalk git@mmarco.beanstalkapp.com:/userwish.git
git push beanstalk master