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takuya@~$ xcode-select --install xcode-select: error: command line tools are already installed, use "Software Update" to install updates
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takuya@~$ softwareupdate -i -r Software Update Tool Finding available software Downloading Safari Downloading ã»ãã¥ãªãã£ã¢ãããã¼ã2018-003
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https://stackoverflow.com/questions/34617452/how-to-update-xcode-from-command-line