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bug#26205: Unhappy with deprecating GREP_OPTIONS

From: Paul Eggert
Subject: bug#26205: Unhappy with deprecating GREP_OPTIONS
Date: Tue, 21 Mar 2017 09:43:40 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 03/21/2017 08:39 AM, Thomas Güttler wrote:
Why is GREP_OPTIONS deprecated?

The main reason is that it breaks shell scripts. Scripts generally expect 'grep' to behave as specified in POSIX and as implemented via traditional 'grep' implementations. GREP_OPTIONS breaks this.

Some shell scripts work around the problem by explicitly unsetting GREP_OPTIONS before they call 'grep'. However, most scripts don't, I expect because their authors are not generally aware of this compatibility issue. So in practice the convenience of GREP_OPTIONS can be more trouble than it's worth.

* Strategy 4: Write a simple wrapper script. No, I think this is too dirty and makes more trouble than it solves.
Why is it dirty? What trouble does it cause, other than the trouble GREP_OPTIONS causes?

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