In use brew when，Often you will encounter all kinds of weird errors，Such as updating time often encountered：
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fatal: git-write-tree: error building trees Cannot save the current index state Error: Failure while executing: git stash save --include-untracked --quiet |
and this：
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Error: Failure while executing: git pull --ff --no-rebase --quiet origin refs/heads/master:refs/remotes/origin/master |
Experiencing these problems，Eighty per cent of your brew directory permissions error。
Use the following command to repair[……]