Разные «аккаунты» для git

git config --local

[user "https://github.com/repo1/repo1.git"]
    name = Repo1Name
    email = repo1@github.com
[user "https://github.com/repo2/repo2.git"]
    name = Repo2Name
    email = repo2@github.com

$ git config --get-urlmatch user.name https://github.com/repo1/repo1.git
Repo1Name
$ git config --get-urlmatch user.name https://github.com/repo2/repo2.git
Repo2Name

GIT-COMMIT-TREE(1)                Git Manual                GIT-COMMIT-TREE(1)

NAME
       git-commit-tree - Create a new commit object
............
While parent object ids are provided on the command line, author and
       committer information is taken from the following environment
       variables, if set:

           GIT_AUTHOR_NAME
           GIT_AUTHOR_EMAIL
           GIT_AUTHOR_DATE
           GIT_COMMITTER_NAME
           GIT_COMMITTER_EMAIL
           GIT_COMMITTER_DATE

       (nb "<", ">" and "\n"s are stripped)