[bug #17623] add option to grep -R to NOT follow symlinks to directory

[Alexei Colin]

Follow-up Comment #6, bug #17623 (project grep):

This would break compatibility, but distinguishing based on case would be a
simple option: -r/-R. For example, grep in Heirloom
<http://heirloom.sourceforge.net/> seems to be doing that. Afaict, for grep
2.7 -R, -r, --recursive are all the same.

>From Heirloom grep man <http://heirloom.sourceforge.net/man/grep.1.html>:

The following options are supported as extensions:
-r       With this option given, grep does not directly search in each given 
file
that is a directory, but descends it recursively and scans each regular file
found below it. Device files are ignored. Symbolic links are followed.
-R       Operates recursively as with the -r option, but does not follow 
symbolic
links that point to directories unless if they are explicitly specified as
arguments.


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