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+#+title: Changing Git Authors
+#+date: 2021-05-30
+#+description: A guide to change Git author names and emails in old commits.
+#+filetags: :dev:
+
+* 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:
+
+#+begin_src sh
+nano change_git_authors.sh
+#+end_src
+
+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=
+
+#+begin_src 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
+#+end_src
+
+Finally, save the bash script and make it executable.
+
+#+begin_src sh
+chmod a+x change_git_authors.sh
+#+end_src
+
+Now you can run the script and should see the process begin.
+
+#+begin_src sh
+./change_git_authors.sh
+#+end_src