Most traditional command line tools (such as those found on a *nix system) have very simple outputs and usually never print in color, unless requested to, even if they do have the capability to do so.
However, there are some "modern" command line tools (especially those used in the field of web development, for example 1,2,3,4) that usually have a lot of color in their outputs and highlight various fields in the presented information.
What are the guidelines for outputting color in a command-line application? Specifically, when should colors be used for the output of a command-line application?
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