bug#17420: [PATCH] grep: always convert fgrep to grep

[Paul Eggert]

Norihiro Tanaka wrote:
> By the way, if `FGREP_NO_DFA' env. is set, fgrep still uses fgrep matcher.

I'd rather not introduce another environment variable.  GREP_COLOR and 
GREP_COLORS and GREP_OPTIONS are now commonly considered to have been 
mistakes, and I'd rather not compound them.

Instead, how about removing the fgrep matcher entirely?  That'll make 
the code simpler and easier to maintain, which is a real plus.  Perhaps 
it'll be slower in a few cases, but as long as significant slowdowns are 
rare, that's OK.

Something like the attached patch, say.

0001-grep-simplify-by-removing-Fexecute-kwsearch.c-etc.patch
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