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git init <repo>
cd <repo>
git remote add -f origin <url>

This creates an empty repository with your remote, and fetches all objects but doesn't check them out. Then do:

git config core.sparseCheckout true

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Git with R-forge

In the following example we will use the package gamboostLSS. Replace this were necessary.

First "download" (clone) existing r-forge repository

mkdir gamboostLSS
cd gamboostLSS

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Undoing the last (local) merge (and thus rewriting the history):

git reset --hard HEAD~

Reverting last commit (commits the commit of mainline before the last commit again)

git revert -m 1 HEAD

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Review code

## set your difftool once:
git config --global diff.tool meld
## then use 
git difftool -d master other_branch
## to see differences

See http://stackoverflow.com/a/2006241/2574238

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Review and Change Remote URL

git remote -v
# View existing remotes

git remote set-url origin https://github.com/user/repo2.git
# Change the 'origin' remote's URL

git remote -v

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Overview of git HowTos

Basics

• Reviewing Code using difftool and mergetool
• Undoing merges

Advanced

• Create sparse clones, i.e. clones of sub-folders of the repository

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Very nice badges for download statistics: https://github.com/metacran/cranlogs.app

See also their project page: http://cranlogs.r-pkg.org/

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Create and push tags

By adding tags and pushing these to github, one can create release versions (aka builts) with Travis-CI that are part of the repository.

I do this for example for my RR Guideline repository.

To make a release do the following:

1. Make changes and commit these:

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## R version 3.2.2 (2015-08-14) -- "Fire Safety"
## Copyright (C) 2015 The R Foundation for Statistical Computing
## Platform: x86_64-pc-linux-gnu (64-bit)
##  
## R is free software and comes with ABSOLUTELY NO WARRANTY.
## You are welcome to redistribute it under certain conditions.
## Type 'license()' or 'licence()' for distribution details.
##