Linux grep and file filter

I can find all files that contain 8585 in the following command (inlcuing files within subdirectories)

grep -R "8585" .

How can I search for 8686, but only for files that end in .txt (in other words *.txt) ?

Thanks
Anthony LuciaAsked:
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woolmilkporcCommented:
find . -type f -name "*.txt" | xargs grep "8585"

Why we have to use "find"?

When "grep" is used with "-R" the file parameter must be a directory ("." in this case), so there is no way of directly applying a filename filter.
"find" works recursively (as "grep -R" does),  has the option of filename filtering, but doesn't have a content filter (which "grep" has). So we must use "find" and "grep".
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savoneCommented:
You can specify the file extension with grep.

grep -r --include "*.txt" 8686 .

or

grep -r "8686" *.txt .
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