When using a version control system (such as Git) in Visual Studio Code, you may observe markers next to files, such as 'U' and 'M'. These markers provide a quick overview of the current file status, helping users identify which files have changed since the last commit.
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M marker: Indicates the file has been modified. This means the file has been edited since the last commit but has not yet been committed again. For example, if you add new code or modify existing code in a project file, the file will be marked as 'M'.
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U marker: Typically indicates the file is untracked. This means the file has been newly added to the project but has not yet been tracked by the version control system. In other words, Git does not recognize the file unless you explicitly instruct Git to start tracking it. For example, if you create a new file, such as 'example.txt', and save it in the project directory, the file will display as 'U' until you use a command like
git addto add it to Git's tracking list.
These markers are highly valuable for development teams as they enable each member to clearly see which files have been changed or added, thereby improving work coordination and reducing conflicts.