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When using Git for version control, is a feature that allows developers to select one or more commits from one branch and apply them to the current branch. This is particularly useful when you want to apply specific commits to your branch instead of merging the entire branch's content.To pick multiple commits individually, you can repeatedly use the command followed by the commit hashes you want to select. For example:Each time you run , it applies the specified commit to the current branch.If you want to pick a series of consecutive commits at once, you can use the following command:In this example, refers to the parent commit of , and is the last commit you want to pick. The above command will pick all commits between and (including both).If you want to pick non-consecutive commits, you can list all the commit hashes you want to select in a single command, separated by spaces. For example:This will apply the commits , , and individually.When performing a operation, conflicts may occur. If conflicts arise, Git will stop applying the commit and prompt you to resolve them. After resolving the conflicts, you need to mark the conflicted files as resolved using , and then use to proceed with applying the selected commits. If you decide not to continue with the operation, you can use to discard the changes and revert to the state before the operation.

To generate patches for specific Git commits, you can use the command. Here are some common usages:Generate a patch for the latest commit:refers to the most recent commit (HEAD). This generates a file starting with the commit hash followed by the commit message.Generate a patch for a specific commit:First, you need to know the commit hash. You can use to view the commit history and identify the hash of the specific commit you want to patch. Then use:Replace with the actual commit hash.Generate patches for a series of commits:If you want to generate patches for a sequence of commits (e.g., from a specific commit to the latest commit), you can do the following:Here, is the hash of the first commit in the sequence, denotes the parent commit, and indicates up to the latest commit on the current branch.Generate patches for all commits within a range:If you want to obtain patches for all commits between two commits, use:This generates a patch file for each commit from to (excluding ).Each generated patch file contains the complete content of a single commit. These files can be applied to another repository or used for code review and other purposes. They are typically shared via email with other developers or distributed through project management tools.

To completely remove a directory from your Git repository, follow these steps:Delete the Local Directory:First, in your local working copy, remove the directory using system commands. For example, on UNIX systems, use the command:Stage the Changes to Git:After deleting the directory, inform Git of this change. To do this, use the command to stage the deletion, with the option, which tells Git to consider all changes (including file deletions):Alternatively, you can stage only the deleted directory:Commit the Changes:Next, commit your changes. When committing, provide an appropriate message describing the changes made:Remove from History:If the directory did not exist in the previous history, simply commit the changes. However, if you want to completely remove the directory from history (e.g., if it contains sensitive data), you'll need to use advanced tools like or .Using :Using (a faster and easier-to-use tool):Note that these operations rewrite your Git history, which may affect other repository copies. Perform these operations with caution and ensure all team members are aware.Push Changes to Remote Repository:Once you've committed the changes (and optionally cleaned the history), push these changes to the remote repository. If you modified the history, you may need to use (or in Git 2.0 and later) to push your changes:If you did not modify the history, the standard push command suffices:Remember that all team members must be aware of these changes, as they will affect their local repositories. If they have uncommitted work based on the deleted directory, they may encounter conflicts.

To view Git logs for a specific user's commits, you can use the command with the option to specify the author's name. This will filter the commits to show only those matching the specified author. The basic format is:Replace "username" with the real name or part of the email address of the user you want to view. Git will display all commits matching the username fragment.For example, if you want to view all logs submitted by John Doe, you can run:If you know the user's email address and want a more precise filter, you can write:Additionally, for more refined searches, you can use regular expressions:This command will display all commits from authors whose names start with 'John'.Example:Suppose I participated in a project named and made many contributions. The project manager wants to view all my commit records, and my Git username is . The project manager can open a terminal or command prompt in the project's root directory and enter the following command:This will output all commits I authored, including commit hashes, commit messages, dates, and times, among other details. The project manager can analyze this information to assess my workload and contributions.

When you want to query all global Git configurations on your current computer, you can use the following Git command:This command lists all global configurations stored in the file within your user's home directory. For example, it displays user name, email, diff tools, and aliases.If you want to view a specific global setting, you can use the following commands:These commands respectively show the user name and email configured globally.For instance, if you have set up global configurations on your machine—such as your user name and email, and aliases for common commands—executing might produce the following output:In this output, you can see the user name is "John Doe", the email is "johndoe@example.com", and several command aliases are defined, such as using instead of and instead of .

Using to Search the Working Directory:If you only want to search files in the current working directory, you can directly use the command. For example:Searching Content in Historical Commits:To search for content in historical commits, combine the parameter of with the command. For example, to search for commits containing 'search keyword':Here, displays the diff for each commit (i.e., code changes), and specifies the string to search for. identifies commits that added or removed the specified string.Combining with External Command:You can pipe the output of to an external command to leverage its advanced search capabilities. For example:For more specific information, such as displaying commit hashes where the keyword matches, add additional parameters. For example:Here, shows the matching line along with the four preceding lines, which typically includes the commit message.Using for Regular Expression Search:For complex searches, use the parameter followed by a regular expression:Limiting the Search Scope to Specific Files:To search only specific file types or paths, specify file paths or patterns in the command. For example, to search only files:Searching Content in Specific Branches or Tags:To search content in a specific branch or tag, specify the branch or tag name in the command. For example, to search in the branch named 'feature-branch':By following these steps, you can flexibly search through Git commit history. Remember to replace and with your actual search terms.

In Git, you can display a pretty branch graph by using different parameters with the command in the command line. Here are several methods:Basic Branch GraphThe simplest branch graph can be generated with the following command:The parameter displays an ASCII art representation of the branch graph.The parameter shows each commit on a single line for a more compact output.The parameter shows all branches, not just the current one.Branch Graph with More InformationIf you want to display additional details such as the author's name and commit date in the branch graph, you can use:The parameter adds pointers to branch names, tags, and other references.Customized Branch GraphYou can customize the output format using . For example:The format string allows customization of colors, commit hashes, branch names, commit messages, commit dates, and author names., , , etc., are used to define color schemes.shows the abbreviated commit hash.shows refnames (branch names, tags).shows the commit message.shows the relative time (e.g., '3 days ago').shows the author's name.shortens the hash length.Using AliasesTo avoid lengthy commands, set aliases in Git. For example, create an alias named :Then, simply use to display the pretty branch graph.ExampleHere is an illustrative example of the output when using in a repository with multiple branches:This simple tree structure shows the commit order and branch relationships. Each and character forms ASCII art representing commits and branches. The leftmost lines indicate the direct history of the current branch, while the right lines represent commits from other branches.

If an error occurs while using , or if you later decide to undo this operation, you can recover using the following methods:Use to locate the previous HEAD position:In Git, records changes to the local repository's HEAD, including branch switches and reset operations. You can first view the recent commit history and HEAD changes using .This will display a series of operations, for example:In this example, represents the HEAD position before the operation.Reset to the commit before the operation:After locating the point you want to recover using , you can reset the HEAD to that point using the command. To recover to the shown in the previous example, you can execute:This will reset the current HEAD, index, and working directory to the state of .Note that the option will discard all uncommitted changes in the working directory. If you want to preserve these changes, you can use the or option, depending on the level of change preservation you desire:: Reset the HEAD to the specified commit, but preserve the staging area and working directory.(default): Reset the HEAD and staging area to the specified commit; changes in the working directory are preserved but not staged.Example:Suppose you accidentally reset your HEAD to two commits before, losing your recent work. You can recover as follows:View to find the recent commit history:Assuming the output shows that the commit to recover is , you can execute:If you want to preserve changes in the working directory and only reset the index and HEAD, you can use:Before performing any operation that might lose data, it's best to make a backup, especially when using the option. This ensures that you don't accidentally lose your work.

If the commit occurred within the past 90 days, executing this command by date appears as follows:Note that refers to the HEAD being at 2013-02-25 in this repository (using reflog), not the last commit before 2013-02-25 in the branch history.This means that by default, this method only applies to history within the last 90 days. Otherwise, you need to execute the following:

Git has a configuration setting that determines whether it treats the file system as case-sensitive or case-insensitive: . To instruct Git to handle the file system as case-sensitive, simply set this option to .Note that setting this option to on a case-insensitive file system is generally not advisable. This can result in unexpected errors. For example, renaming files solely by altering letter case may cause Git to report false conflicts or generate duplicate files.DocumentationFrom the documentation: If set to , this option enables various workarounds that allow Git to function better on case-insensitive file systems (e.g., FAT). For instance, if the directory listing shows but Git expects , Git will assume it is the same file and continue to track it as . The default value is , but is automatically detected and set to (if applicable) when creating a repository via or .

Typically, add the changes you don't want to hide to the index, then use the option to hide them.The last step is optional but usually necessary. It removes the changes from the index.Warning pushes all changes to the stash, including both staged and unstaged changes. After the stash is created, only the index remains. When you later pop the stash, this may result in merge conflicts.

和 都是Git中用于合并不同分支上的更改的命令，但它们以不同的方式处理合并操作。Git merge:命令通常用于将两个不同的分支合并到一起。当你执行 时，Git会创建一个新的“合并提交”（merge commit），该提交具有两个父提交：一个是当前分支的最后一个提交（HEAD），另一个是被合并分支的最后一个提交。合并提交的出现保留了项目历史的真实性，显示了一个分支合并到另一个分支的时间点。合并是一个非破坏性操作，即它不会改变已有分支的历史。Git rebase:命令用于将一个分支的更改重新应用于另一个分支上。当你执行 时，Git会将你正在工作的分支的提交“转移”到目标分支的顶端。这种操作会改写历史，因为它实际上是重新创建了那些提交，就好像你是在目标分支的当前状态下重新做了那些工作。可以创造出一条更干净、线性的历史，这样当查看项目历史的时候，就像是按照时间顺序一步步地发生的。例子:假设你在 分支上工作，并且需要将 分支的最新更改集成到你的 分支中。你可以选择 或 来实现这个目的。如果你选择 ，那么Git会创建一个新的合并提交，使得 分支包含了 分支的所有更改。这个合并提交会有两个父提交，一个指向 分支的最后一个提交，另一个指向 分支的最后一个提交。如果你选择 ，Git会将你 分支上的每个提交重新应用到 分支的最新提交之上。结果是你的 分支看起来就像是在 分支的最新提交之后才开始的，这就创造了一条干净的、没有分叉的历史线。但是需要注意的是，如果 分支上的更改与 分支上的更改有冲突，你需要在 过程中手动解决这些冲突。

You can enable credential storage in Git using .When you run this command, the system will prompt you for your username and password the first time you pull or push from a remote repository.Subsequently, for subsequent communication with the remote repository, you do not need to provide your username and password.The credentials are stored in the file in plaintext format.Additionally, you can use other helpers like for memory caching:It requires an optional that determines how long credentials are retained in memory. With this helper, credentials never touch the disk and are deleted after the specified timeout. The default value is 900 seconds (15 minutes).Warning: If you use this method, your Git account password will be stored in plaintext in the global file, for example, at on Linux.If you do not wish to do this, use an SSH key instead for your account.

The .gitignore file tells Git which files and directories to ignore. Typically, these files are build artifacts, temporary files, or other types of files not part of the repository. Git will ignore any directory or file that matches the patterns specified in the .gitignore file.Examples:Instead, the .gitkeep file is used in Git to maintain otherwise empty directories. By default, Git does not track empty folders, so if you want to keep a directory in the repository, you must add a .gitkeep file to it. The filename is more important than the actual content of the file..gitkeep file example:Overall, the .gitignore file tells Git which files and directories to ignore. To maintain an otherwise empty Git directory, use .gitkeep. They serve different purposes and are distinct from each other.

To change the commit author of a specific commit, you can use the command to modify the most recent commit, or if you need to change an earlier commit, you can use the command. Below is a detailed explanation of the steps for both scenarios.UsingIf you are changing the most recent commit, you can use the option to change the commit author. Below are the steps:Open the command line or terminal.Navigate to the repository directory where you want to change the commit author.Execute the following command to change the author of the most recent commit:For example, if you want to change the author to "John Doe" with the email "johndoe@example.com", the command would be:This will open a text editor, allowing you to modify the commit message. After saving and closing the editor, the commit author information will be updated.Note that this method modifies the last commit and creates a new commit hash. Therefore, if you have already pushed the commit to a remote repository, you must use to overwrite the commit history on the remote repository.UsingIf you need to change the author of an earlier commit, you can use the command. Here is a simplified example:Open the command line or terminal.Navigate to your repository directory.Find the commit hash of the commit you want to change the author for. You can use to view the commit history.Run the command to start an interactive rebase:For example, if the commit hash is , the command would be:In the opened text editor, change the for the commit you want to change to .Save and close the editor.When rebasing to the specified commit, execute the following command to change the author information:Using the same example, for "John Doe", the command would be:After modifying the author information, continue the rebase process:If there are conflicts, resolve them and use to mark the changed files as resolved.Re-run until the rebase is complete.Since this will change the commit hashes of all subsequent commits in history, if these commits have already been pushed to a remote repository, you may need to use to update the remote repository. When performing these operations, be aware that modifying public history is a risky behavior as it can confuse and cause extra work for other collaborators. Therefore, these operations should only be performed when absolutely necessary and with the agreement of all other collaborators in the repository.

When you encounter a merge conflict in Git and decide not to proceed with completing the merge, you can use the following command to abort the merge process:Alternatively, in older versions of Git, you may need to use:Using the command will revert to the state before the merge began and attempt to restore the working directory and index to their pre-merge state.If your working directory was clean (with no uncommitted changes) before the merge, then will return your working directory to its exact state prior to the merge. If there were uncommitted changes before the merge, those changes will remain in your working directory, but you may need to manually resolve any conflicts introduced by the merge.For example, suppose I developed a new feature on the branch and now want to merge these changes into the branch. When I run , I encounter a conflict. I realize it's not the appropriate time to resolve these conflicts, or I decide to adopt a different strategy for integrating these changes, so I choose to abort the merge. I then run to return to the state before the merge and reconsider my merge strategy.

git add -A and git add . behave similarly in most cases, but they can exhibit different behaviors in specific Git versions and contexts. Here are their main differences:git add -A: This command is shorthand for , which stages all changes in the working directory—including file additions, modifications, and deletions—into the staging area. This operation affects the entire repository.git add .: This command stages new files and modified files in the current directory and its subdirectories but does not stage deleted files. This operation is limited to the current directory and its subdirectories.In newer Git versions (starting from 2.0), and are nearly equivalent because now includes deleted files. However, is confined to the current directory, whereas can be executed anywhere in the repository and affects the entire repository.In summary, if you want to include all change types (additions, modifications, deletions) and ensure staging applies to the entire repository, using is a safer choice. If you only need to stage changes in the current directory and its subdirectories, use . Always verify your Git version's behavior, as it may impact command accuracy.

When you want to push a local Git tag to a remote repository, you can use the command to accomplish this. There are two main scenarios: pushing a single tag or pushing multiple tags. Below I will explain the operation methods for both.Pushing a Single Tag to a Remote RepositoryAssume you have already created a local tag . To push this tag to the remote repository, use the following command:Here, is the default name for the remote repository, and is the tag name you want to push. After executing this command, the tag will be pushed to the remote repository.Pushing All Newly Created Local Tags to a Remote RepositoryIf you want to push all newly created local tags to the remote repository at once, use:This command pushes all newly created local tags to the remote repository. Note that this command does not push deleted tags.ExampleAssume you are releasing a project version and create a tag named to mark this release:After creating the tag, confirm it can be pushed to the remote repository for team sharing:This way, your team members can obtain this specific project snapshot by pulling the remote tag.If your team has adopted a versioning strategy and you have a series of tags (e.g., , , , etc.) that need to be pushed together, you might choose to push all tags:This is how to push Git tags to a remote repository.

How to list all files in a commit? To list all files in a Git commit, you can use the command with the or option. Here's how to do it:Using the option:is the hash of the commit you want to inspect. This command lists all file names that were changed (including additions and deletions) in that commit.Using the option:This command not only lists the file names but also shows the status of each file, such as for Modified, for Added, and for Deleted.If you only want to obtain the file list without seeing other commit details (such as diff or commit message), you can use to suppress additional output:Or:If you don't know the commit hash but know it's the most recent commit, you can use to reference the latest commit, or for the previous commit, and so on. For example, to list all files in the most recent commit:Additionally, if you want to view which files were modified in the last commit of a specific branch or tag, replace with the branch name or tag name. For example, to view the last commit of the branch:Using these methods, you can easily view all files included in a Git commit.

When working with Git, you might find yourself making changes on the wrong branch or decide that your modifications should be on a new branch to keep the main branch clean or for other reasons. Fortunately, Git offers flexibility to move uncommitted changes to a new branch. Here are the steps:Check current changes:Before moving the changes, check the status of your working directory and staging area. You can use the following command:This will display the status of your current changes, whether they are staged or unstaged.Create and switch to a new branch:If you have staged the changes, unstage them first (if you intend to move them to the new branch). Then, create and switch to a new branch using the following command:This command creates a new branch named and switches to it.Add and commit changes:Now that you are on the new branch, add and commit your changes. Use the following command to stage all changes:Or, if you want to add specific files, use:Next, commit the changes to your new branch:(Optional) Keep the main branch clean:If you just created the new branch from the main branch (e.g., or ) and don't want these changes to appear on the main branch, switch back to the main branch and discard these changes. First, switch back to the main branch:Then, use the following command to discard uncommitted changes:This will reset the main branch to the last commit state, discarding all uncommitted changes. Note that this is a dangerous operation as it discards all uncommitted changes. Before using , ensure you don't need these uncommitted changes.This is the basic process for moving uncommitted work to a new branch. Let's look at a specific example:Suppose you are working on the main branch and have made some changes. Now you want to move these changes to a new branch .Check changes:Create and switch to new branch :Stage all changes and commit them to the new branch:If needed, switch back to branch and discard changes:Now, the new branch contains the previously uncommitted work, while the branch remains unchanged.