$ git config --global user.name "Firstname Lastname"Sets the name of the user for all git instances on the system
$ git config --global user.email "your_email@youremail.com"

[core]
    repositoryformatversion = 0
    filemode = false
    bare = false
    logallrefupdates = true
    symlinks = false
    ignorecase = true
    hideDotFiles = dotGitOnly
[remote "origin"]
    url = git@github.com:freeenergy/my-project.git
    fetch = +refs/heads/*:refs/remotes/origin/*
[user]
    name = my name
    email = myEmail.com

[user]
    name = Bob Gilmore
    email = me@mydomain.com

$ git config user.email
# you@there.com

$ git config --global user.email "me@here.com"

> git config --local -e

[user]
    name = Anna Kowalska
    email = anna.kowalska@wp.pl

#!/bin/sh

git filter-branch --env-filter '
OLD_EMAIL="your-old-email@example.com"
CORRECT_NAME="Your Correct Name"
CORRECT_EMAIL="your-correct-email@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