Change author information in past commits

Change Author.sh

#!/bin/sh
# Rename an email address in all old commits.
# WARNING: Will change all your commit SHA1s.

git filter-branch -f --env-filter '

    an="$GIT_AUTHOR_NAME"
    am="$GIT_AUTHOR_EMAIL"
    cn="$GIT_COMMITTER_NAME"
    cm="$GIT_COMMITTER_EMAIL"
    
    case "$GIT_AUTHOR_NAME" in
    
        oldname)
            an="newname"
            am="newemail@example.com"
        ;;

        plugin-master)
            an="plugin-master"
            am="cabal@wordpress.org"
        ;;
    
    esac

    case "$GIT_COMMITTER_NAME" in

        oldname)
            cn="newname"
            cm="newemail@example.com"
        ;;

        plugin-master)
            cn="plugin-master"
            cm="cabal@wordpress.org"
        ;;

    esac

    export GIT_AUTHOR_NAME="$an"
    export GIT_AUTHOR_EMAIL="$am"
    export GIT_COMMITTER_NAME="$cn"
    export GIT_COMMITTER_EMAIL="$cm"
'