How to merge remote master to local branch

From your feature branch (e.g configUpdate) run:

git fetch
git rebase origin/master

Or the shorter form:

git pull --rebase

Why this works:

git merge branchname takes new commits from the branch branchname, and adds them to the current branch. If necessary, it automatically adds a "Merge" commit on top.
git rebase branchname takes new commits from the branch branchname, and inserts them "under" your changes. More precisely, it modifies the history of the current branch such that it is based on the tip of branchname, with any changes you made on top of that.
git pull is basically the same as git fetch; git merge origin/master.
git pull --rebase is basically the same as git fetch; git rebase origin/master.

So why would you want to use git pull --rebase rather than git pull? Here's a simple example:

You start working on a new feature.
By the time you're ready to push your changes, several commits have been pushed by other developers.
If you git pull (which uses merge), your changes will be buried by the new commits, in addition to an automatically-created merge commit.
If you git pull --rebase instead, git will fast forward your master to upstream's, then apply your changes on top.

I found out it was:

$ git fetch upstream
$ git merge upstream/master

Switch to your local branch

> git checkout configUpdate

Merge remote master to your branch

> git rebase master configUpdate

In case you have any conflicts, correct them and for each conflicted file do the command

> git add [path_to_file/conflicted_file] (e.g. git add app/assets/javascripts/test.js)

Continue rebase

> git rebase --continue

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