How to change git username

In the process of using Git for code management, we sometimes need to modify the configured Git user name and email address. When we submit code to the remote code repository, Git will use the username and email address we added in the local Git configuration file by default.

If you need to modify the username on Git, you need to follow the steps below:

1. Open the command line tool (Command Prompt under Windows, Mac OS X and Linux (Terminal below), enter the following command to view the current Git username and email address:

git config --global user.name
git config --global user.email

This will output the username and email address set in your current Git configuration.

2. If you need to change your username, enter the following command:

git config --global user.name "你的新用户名"

3. If you need to change your email address, enter the following command:

git config --global user.email "你的新邮箱地址"

4. To check whether the modification is successful, run the following command:

git config --global user.name
git config --global user.email

At this time, your new username and email address will be output.

Note: Modifying your Git username and email address will only affect your settings in the local Git configuration file. If the code you submitted has been forked or cloned by other users into their own code base, they will See your previous username and email address. To do this, you need to replace your public key and reset your identity in your ssh configuration file (if you used ssh key authentication). If you want to globally modify the username and email address in all historical submission information, you need to use the following command:

git filter-branch -f --env-filter '
OLD_EMAIL="你的旧邮箱地址"
CORRECT_NAME="你的新用户名"
CORRECT_EMAIL="你的新邮箱地址"
if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$CORRECT_NAME"
    export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$CORRECT_NAME"
    export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

Note: This command will modify all your historical submissions. Only execute this if you are sure to do so. Execute this command after the operation. Also note that this command will modify the commit hash, which will force hard changes to be added to Git's history, possibly affecting other people's work. So please do this with caution.

In short, it is easy to modify your Git username and email address, but be aware that modifications may affect previous submission records, especially in the case of multi-person collaboration. It is recommended to think carefully before modifying.

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