A subsequent GitHub Desktop tutorial will look at the GitHub Desktop client's support for branching, merging, reverting and interacting with remote repositories through push, pull and fetch commands. GitHub Desktop setup. The GitHub Desktop app download and setup process is straightforward. It's a 77 MB download, and the.exe file will install. GitHub Git OS X Mac As a developer, you probably use Git and GitHub all the time. In this short tutorial, we’ll make sure that’s all set up correctly, and walk you through how to connect the two together on your Mac.
Apps on GitHub allow you to automate and improve your workflow. You can build apps to improve your workflow. You can also share or sell apps in GitHub Marketplace. To learn how to list an app on GitHub Marketplace, see 'Getting started with GitHub Marketplace.'
GitHub Apps are the officially recommended way to integrate with GitHub because they offer much more granular permissions to access data, but GitHub supports both OAuth Apps and GitHub Apps. For information on choosing a type of app, see 'About apps' and 'Differences between apps.'
If you are using your app with GitHub Actions and want to modify workflow files, you must authenticate on behalf of the user with an OAuth token that includes the
workflow scope. The user must have admin or write permission to the repository that contains the workflow file. For more information, see 'Understanding scopes for OAuth apps.'
For a walkthrough of the process of building a GitHub App, see 'Building Your First GitHub App.'
Requesting support
For questions, bug reports, and discussions about GitHub Apps, OAuth Apps, and API development, explore the GitHub API Development and Support Forum. The forum is moderated and maintained by GitHub staff, but questions posted to the forum are not guaranteed to receive a reply from GitHub staff.
Consider reaching out to GitHub Support directly using the contact form for:
Comparing changes with git diff
Diffing is a function that takes two input data sets and outputs the changes between them.
git diff is a multi-use Git command that when executed runs a diff function on Git data sources. These data sources can be commits, branches, files and more. This document will discuss common invocations of git diff and diffing work flow patterns. The git diff command is often used along with git status and git log to analyze the current state of a Git repo.Reading diffs: outputsRaw output format
The following examples will be executed in a simple repo. The repo is created with the commands below:
If we execute
git diff at this point, there will be no output. This is expected behavior as there are no changes in the repo to diff. Once the repo is created and we've added the diff_test.txt file, we can change the contents of the file to start experimenting with diff output.
Executing this command will change the content of the
diff_test.txt file. Once modified, we can view a diff and analyze the output. Now executing git diff will produce the following output:
Let us now examine a more detailed breakdown of the diff output.
1. Comparison input
This line displays the input sources of the diff. We can see that
a/diff_test.txt and b/diff_test.txt have been passed to the diff.
2. Meta data
This line displays some internal Git metadata. You will most likely not need this information. The numbers in this output correspond to Git object version hash identifiers.
3. Markers for changes
These lines are a legend that assigns symbols to each diff input source. In this case, changes from
a/diff_test.txt are marked with a --- and the changes from b/diff_test.txt are marked with the +++ symbol.
4. Diff chunks
The remaining diff output is a list of diff 'chunks'. A diff only displays the sections of the file that have changes. In our current example, we only have one chunk as we are working with a simple scenario. Chunks have their own granular output semantics.
The first line is the chunk header. Each chunk is prepended by a header inclosed within
@@ symbols. The content of the header is a summary of changes made to the file. In our simplified example, we have -1 +1 meaning line one had changes. In a more realistic diff, you would see a header like:
In this header example, 6 lines have been extracted starting from line number 34. Additionally, 8 lines have been added starting at line number 34.
The remaining content of the diff chunk displays the recent changes. Each changed line is prepended with a
+ or - symbol indicating which version of the diff input the changes come from. As we previously discussed, - indicates changes from the a/diff_test.txt and + indicates changes from b/diff_test.txt .
Highlighting changes1.
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