me@ubuntu:tmp$ mkdir open
me@ubuntu:tmp$ cd open/
me@ubuntu:open$ ls
me@ubuntu:open$ echo 123567 > file1
me@ubuntu:open$ echo 123567 > file2
me@ubuntu:open$ echo 123567 > file3
me@ubuntu:open$ echo helloworld > file4
me@ubuntu:open$ find ./ | xargs grep -Hn 'hello'
./file4:1:helloworld
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