Github user michael-o commented on the issue:
https://github.com/apache/maven/pull/114
They are several issues. People are used to
[GNU](https://www.gnu.org/software/grep/manual/grep.html#General-Output-Control)
and [BSD](https://www.freebsd.org/cgi/man.cgi?query=grep&sourceid=opensearch)
tools like grep. They use values `never`, `always`, `auto`. Having said that I
do think we need to do this exactly the same way:
[`grep.c`](https://github.com/freebsd/freebsd/blob/master/usr.bin/grep/grep.c#L627-L647).
Option `always` requires special attention due to `isatty` in combination with
`less(1)`.
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