Multiple working directories
Git for a long time allowed to specify where to find the administrative area of the repository (the .git directory) with the git --git-dir=<path> <command>, or the GIT_DIR environment variable, making it possible to work from the detached working directory.
To be able to reliably use multiple working directories sharing a single repository, we had to wait until version 2.5 of Git. With it, you can create a new linked work tree by using git worktree add <path> <branch>, allowing us to have more than one branch checked out. For convenience, if you omit the <branch> argument, then a new branch will be created based on the name of the created worktree.
Note
If you use an older Git version, there is always the git-new-workdir ...
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