Does not xargs(1) accept the output from find(1) as it arrives, and
ship it off to grep(1) in suitable buffersful without waiting for
find(1) to finish?
No, xargs takes from stdin a list and builds the argv[] for it's command.
So worst case scenario it will wait for 1023 "lines" of input (without
the minus-ell flag) before doing it's fork()
This can of course take a LONG time to accumulate if you are walking
many NFS mounts. But if you use a suitable minus-ell flag, it will still
be faster than -exec
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