update: make --help
consistent, add options
Document short options and common global options. Apply the same indent as other command help strings.
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#: Fetch the newest version of Homebrew and all formulae from GitHub using `git`(1) and perform any necessary migrations.
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#:
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#: --merge `git merge` is used to include updates (rather than `git rebase`).
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#: --force Always do a slower, full update check (even if unnecessary).
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#: -f, --force Always do a slower, full update check (even if unnecessary).
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#: -v, --verbose Print the directories checked and `git` operations performed.
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#: -d, --debug Display a trace of all shell commands as they are executed.
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#: -h, --help Show this message.
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# Don't need shellcheck to follow this `source`.
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# shellcheck disable=SC1090
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