Everything You Need To know about Git


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BestASPNETHostingReview.com | Best and cheap Git hosting. In this post I will share some tips about Git. So let’s check it out.

Show branches, tags in git log

$ git log –oneline –decorate

Diff by highlighting inline word changes instead of whole lines

$ git diff –word-diff

This flag works with other git commands that take diff flags such as git log -p and git show.

Short status output

The default, verbose status output is fine for beginners, but once you get proficient with git there is no need for it. Since I check the status often, I want it to be as concise as possible.

Push a branch and automatically set tracking

“Tracking” is essentially a link between a local and remote branch. When working on a local branch that tracks some other branch, you can git pull and git push without any extra arguments and git will know what to do.

However, git push will by default push all branches that have the same name on the remote. To limit this behavior to just the current branch, set this configuration option:

This is to prevent accidental pushes to branches which you’re not ready to push yet.

Easily track a remote branch from someone else

Once your teammate has shared a branch he or she was working on, you need to create a local branch for yourself if you intend to make changes to it. This does that and sets up tracking so that you can just git push after making changes.

Checkout a branch, rebase and merge to master

# on branch “master”: $ git checkout feature && git rebase @{-1} && git checkout @{-2} && git merge @{-1} # rebases “feature” to “master” and merges it in to master

The special “@{-n}” syntax means “n-th branch checked out before current one”. When we checkout “feature”, “@{-1}” is a reference to “master”. After rebasing, we need to use “@{-2}” to checkout master because “@{-1}” is a reference to the same branch (“feature”) due to how rebasing works internally.

Pull with rebase instead of merge

Because branch merges in git are recorded with a merge commit, they are supposed to be meaningful—for example, to indicate when a feature has been merged to a release branch. However, during a regular daily workflow where several team members sync a single branch often, the timeline gets polluted with unnecessary micro-merges on regular git pull. Rebasing ensures that the commits are always re-applied so that the history stays linear.

You can configure certain branches to always do this without the --rebase flag:

You can also set up a global option to set the last property for every new tracked branch:

Find out if a change is part of a release

It’s not rare that you know a SHA-1 of a commit but aren’t sure where is it located in project’s history. If you’re like me, you probably want to know was that change a part of some release or not. You can use git show to see the commit message, date and the full diff, but this doesn’t help us much—especially since comparing commit dates in a project’s history doesn’t necessarily correspond to the order in which they were applied.

The name-rev command can tell us the position of a commit relative to tags in the project. The example above is from the Ruby on Rails project. This tells us that this commit is located 6 commits before “v2.3.8” was tagged—we can be certain that this change is now part of Rails 2.3.8, then.

The command goes even further in its usefulness. Suppose you follow a discussion in which someone mentions a few commits:

This bug was introduced in e6cadd422b72ba9818cc2f3b22243a6aa754c9f8 but fixed in 50f3754525c61e3ea84a407eb571617f2f39d6fe, if I recall correctly.

You can copy that to clipboard and pipe the comment to git name-rev, which will recognize commit SHAs and append tag information to each:

See also: git help describe

Find out which branch contains a change

This filters the lists of branches to only those which have the given commit among their ancestors. To also include remote tracking branches in the list, include the “-a” flag.

See which changes from a branch are already present upstream

The cherry command is useful to see which commits have been cherry-picked from a development branch to the stable branch, for instance. This command compares changes on the current (“feature”) branch to upstream (“master”) and indicates which are present on both with the “-” sign. Changes still missing from upstream are marked with “+”.

Show the last commit which message matches a regex

Fetch a group of remotes

You can define a default list of remotes to be fetched by the remote update command. These can be remotes from your teammates, trusted community members of an opensource project, or similar. You can also define a named group like so:

Write commit notes

Git notes are annotations for existing commits. They don’t change the history, so you are free to add notes to any existing commits. Your notes are stored only in your repo, but it’s possible to share notes. There are interesting ideas for possible use-cases for notes, too.

Install “hub”

Hub teaches git about GitHub. If you’re using repos from GitHub on a regular basis, you definitely want to install hub and save a lot of keystrokes—especially if you’re involved in opensource.