Re: [bug #32501] Manual page does not include a warning for GREP_OPTIONS

[Reuben Thomas]

I agree with the subject of the bug report; what I didn't agree with
was the specific suggestion of warning about --color, but it's true
that currently there's no warning in the man page. Something like
(adding a paragraph to the GREP_OPTIONS section):

You should consider the effect of GREP_OPTIONS on other programs that
use grep: avoid options like `-P' which will change their behavior.
(Shell aliases are a better way to include such options in a default
set, rather like rgrep.) Programs calling grep should unset
GREP_OPTIONS to avoid unintended behavior (and security holes).

If we can get an agreed wording, I'll put together a patch for the man
page and texinfo.

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