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+date = 2021-05-30
+title = "Changing Git Authors"
+description = "Learn how to haphazardly replace Git authors and/or emails within the Git history."
++++
+
+## Changing Git Author/Email Based on Previously Committed Email
+
+Here's the dilemma: You've been committing changes to your git repository with
+an incorrect name or email (or multiple repositories), and now you want to fix
+it.
+Luckily, there's a semi-reliable way to fix that.
+While I have never experienced issues with this method, some people have 
+warned that it can mess with historical hashes and integrity of commits, so 
+use this method only if you're okay accepting that risk.
+
+Okay, let's create the bash script:
+
+```sh
+nano change_git_authors.sh
+```
+
+The following information can be pasted directly into your bash script. The only
+changes you need to make are to the following variables:
+
+-   `OLD_EMAIL`
+-   `CORRECT_NAME`
+-   `CORRECT_EMAIL`
+
+```sh
+#!/bin/sh
+
+# List all sub-directories in the current directory
+for dir in */
+do
+    # Remove the trailing "/"
+    dir=${dir%*/}
+    # Enter sub-directory
+    cd $dir
+
+    git filter-branch --env-filter '
+
+    OLD_EMAIL="old@example.com"
+    CORRECT_NAME="your-new-name"
+    CORRECT_EMAIL="new@example.com"
+
+    if [ "$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
+
+    git push --force --tags origin 'refs/heads/*'
+
+    cd ..
+done
+```
+
+Finally, save the bash script and make it executable.
+
+```sh
+chmod a+x change_git_authors.sh
+```
+
+Now you can run the script and should see the process begin.
+
+```sh
+./change_git_authors.sh
+```