Including git “contrib” subtree about git_osx_installer HOT 6 CLOSED

$ find /usr/local/git/ | grep subtree
/usr/local/git/libexec/git-core/git-merge-subtree
/usr/local/git/libexec/git-core/git-subtree
/usr/local/git/share/man/man1/git-subtree.1

$ git subtree
usage: git subtree add   --prefix=<prefix> <commit>
   or: git subtree add   --prefix=<prefix> <repository> <ref>
   or: git subtree merge --prefix=<prefix> <commit>
   or: git subtree pull  --prefix=<prefix> <repository> <ref>
   or: git subtree push  --prefix=<prefix> <repository> <ref>
   or: git subtree split --prefix=<prefix> <commit...>

    -h, --help            show the help
    -q                    quiet
    -d                    show debug messages
    -P, --prefix ...      the name of the subdir to split out
    -m, --message ...     use the given message as the commit message for the merge commit

options for 'split'
    --annotate ...        add a prefix to commit message of new commits
    -b, --branch ...      create a new branch from the split subtree
    --ignore-joins        ignore prior --rejoin commits
    --onto ...            try connecting new tree to an existing one
    --rejoin              merge the new branch back into HEAD

options for 'add', 'merge', 'pull' and 'push'
    --squash              merge subtree changes as a single commit