git rebase -i -p <some HEAD before all of your bad commits>

git rebase --continue

git filter-branch -f --env-filter "GIT_AUTHOR_NAME='Newname'; GIT_AUTHOR_EMAIL='new@email'; GIT_COMMITTER_NAME='Newname'; GIT_COMMITTER_EMAIL='new@email';" HEAD

git config --global user.name "you name"
git config --global user.email you@domain.com
git commit --amend --reset-author

git rebase -i HEAD^^^^^^ # as required

pick abcd Someone else's commit
pick defg my bad commit 1
pick 1234 my bad commit 2

pick abcd Someone else's commit
pick defg my bad commit 1
exec git commit --amend --author="New Author Name <email@address.com>" -C HEAD
pick 1234 my bad commit 2
exec git commit --amend --author="New Author Name <email@address.com>" -C HEAD

git change-commits GIT_AUTHOR_NAME "old name" "new name"

git change-commits GIT_AUTHOR_EMAIL "old@email.com" "new@email.com" HEAD~10..HEAD

change-commits = "!f() { VAR=$1; OLD=$2; NEW=$3; shift 3; git filter-branch --env-filter "if [[ \"$`echo $VAR`\" = '$OLD' ]]; then export $VAR='$NEW'; fi" $@; }; f "

john=John Doe <john.doe@hotmail.com>
jill=Jill Doe <jill.doe@hotmail.com>

Name you want <email you want> Name you don't want <email you don't want>

$ git rebase --onto origin/master origin/master@{1} master

$ git log --author=user@wrong.email --all

$ git cat-file -p <ID of wrong commit> |
  sed -e 's/user@wrong.email/user@example.com/g' > tmp.txt
$ git hash-object -t commit -w tmp.txt
<ID of corrected commit>

$ git replace <ID of wrong commit> <ID of corrected commit>

$ git replace -l

$ git log --author=user@wrong.email --all

git config user.name <good name>
git config user.email <good email>
git reset HEAD^
git stash
git reset HEAD^
git commit -a
git stash pop
git commit -a

pick a07cb86 Project tile template with full details and styling
x git commit --amend --reset-author -Chead

git config user.email my_other_email@example.com
git commit --amend

#!/bin/sh

REPO_URL=ssh://path/to/your.git
REPO_DIR=rewrite.tmp

# Clone the repository
git clone ${REPO_URL} ${REPO_DIR}

# Change to the cloned repository
cd ${REPO_DIR}

# Checkout all the remote branches as local tracking branches
git branch --list -r origin/* | cut -c10- | xargs -n1 git checkout

# Rewrite the history, use a system that will preseve the eol (or lack of in commit messages) - preferably Linux not OSX
git filter-branch --env-filter '
OLD_EMAIL="me@something.com"
CORRECT_NAME="New Me"

if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$CORRECT_NAME"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$CORRECT_NAME"
fi
' --tag-name-filter cat -- --branches --tags

# Force push the rewritten branches + tags to the remote
git push -f

# Remove all knowledge that we did something
rm -rf ${REPO_DIR}

# Tell your colleagues to `git pull --rebase` on all their local remote tracking branches

$ git changemail -a old@email.com -n newname -m new@email.com

$ git changemail -b old@email.com -n newname -m new@email.com -- -f <branch> <branch2>

$ git changemail --show-both

git rebase -i YOUR_FIRTS_COMMIT_SHA^

while true; do git commit --amend --author="Name Surname <email@example.com>" --no-edit && git rebase --continue; done

$ git checkout <commit-hash>                            # checkout to the commit need to modify
$ git commit --amend --author "name <author@email.com>" # change the author name and email

$ git replace <old-commit-hash> <new-commit-hash>      # replace the old commit by new one
$ git filter-branch -- --all                           # rewrite all futures commits based on the replacement

$ git replace -d <old-commit-hash>     # remove the replacement for cleanliness
$ git push -f origin HEAD              # force push

$ git rebase -i <commit-hash>          # go to last good commit

# Editor would open, replace 'pick' with 'edit' before the commit want to change author

$ git commit --amend --author="author name <author@email.com>"  # change the author name & email

# Editor would open, save and exit
$ git rebase --continue                    # finish the rebase

#!/bin/sh
PWD=`pwd`
if [[ $PWD == *"Ippon"* ]] # 1)
then
  EMAIL=$(git config user.email)
  if [[ $EMAIL == *"Work"* ]] # 2)
  then
    echo "";
  else
    echo "Email not configured to your Work email in the Work directory.";
    git config user.email "youremail@youremail.com"
    echo "Git email configuration has now been changed to "$(git config user$
    echo "nPlease run your command again..."
    echo ''
    exit 1
  fi;
elif [[ $PWD == *"Personal"* ]]
then
  EMAIL=$(git config user.email)
  if [[ $EMAIL == "youremail@youremail.com" ]]
  then
    echo "";
  else
    echo "Email is not configured to your personal account in the Personal di$
    git config user.email "youremail@youremail.com"
    echo "Git email configuration has now been changed to "$(git config user$
    echo "nPlease run your command again..."
    echo ''
    exit 1;
  fi;
fi;