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bug#29354: GREP_OPTIONS not processed

From: Paul Eggert
Subject: bug#29354: GREP_OPTIONS not processed
Date: Sat, 18 Nov 2017 19:10:13 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

Dennis wrote:
Running grep 2.20 on Debian Jessie.

Apparently grep is not processing the GREP_OPTIONS
environment variable.

That's odd; in the master sources GREP_OPTIONS still works; it's just that it's deprecated and issues a warning. Perhaps Debian has changed that?

Anyway, GREP_OPTIONS is deprecated because of correctness and security issues caused by having environment variables change the behavior of standard commands. If you want your grep to default to -i, you can create a script called 'grep' that invokes /usr/bin/grep -i, and put your script in your PATH before /usr/bin.

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