Is there a way to grep with a constrained file type?
Solution 1:
POSIX grep doesn't have such options, but coreutils grep does.
grep -r --include='*.xml' -l foobar .
should do it.
FreeBSD grep (and OS X) appear to have the same thing, Solaris & AIX lack them AFAICT.
Solution 2:
You could also do:
find . -name "*.xml" -exec grep -l "foobar" {} \;