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Underlines are only for links; don't use them in copy for anything else (outside certain legal contexts). Either use bold/italic or quotes, but not both. It's redundant. Which one you choose will...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/20113 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/20113 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Underlines are only for links; don't use them in copy for anything else (outside certain legal contexts). Either use bold/italic or quotes, but not both. It's redundant. Which one you choose will depend on what's easiest to read. If you have many of these steps and commands, I would go with a bold or italic, as too many quotes gets visually exhausting.