Inspired by spring cleaning of a collection of "New Text Document (n).txt" files on my desktop I decided to prepare a collection of git useful scripts, yet another. Here is the list:

1. Replace git commit user name and email address in a branch history:

   #!/bin/sh
   
   git filter-branch --env-filter '
   OLD_EMAIL="not@used.anymore"
   CORRECT_NAME="My Name"
   CORRECT_EMAIL="my@new.email"
   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 master --branches --tags