[bug #17623] grep -R should NOT follow symlinks

[Jim Meyering]

Follow-up Comment #2, bug #17623 (project grep):

Hi Paolo,

I too have long wished for a way to make grep -R not follow symlinks.

My first thought was to handle it like find, cp, du, ls and chown etc.
have done, with their -H, -L and -P options, but all of those are already
in use with grep.

One approach would be to extend
--directories=...
or some new long-option to accept three new values,
corresponding to these (useful only with --recursive, which is
equivalent to --directory=recurse, or perhaps implying that):

  H  traverse-command-line-symlink-to-dir
  L  traverse-every-symlink-to-dir
  P  traverse-no-symlink-to-dir


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