GREP_OPTIONS is useful, because it allows the user set one option for
many forms of grep (grep, egrep, fgrep, rgrep, zgrep, bzgrep, bzfgrep,
bzegrep, etc.).
For example, here's what the man page for bzgrep says:
If the GREP environment variable is set, bzgrep uses it as the grep
program to be invoked.
For example:
for sh: GREP=fgrep bzgrep string files
for csh: (setenv GREP fgrep; bzgrep string files)
If you disable GREP_OPTIONS and insist that users replace it with an
alias, then users will need to set an alias for every form of *grep, and
there are many different greps.
--
Please create and enforce a system-wide policy to unset GREP_OPTION by default
https://bugs.launchpad.net/bugs/67141
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