[bug #54730] Add additional valuable example of find -quit

[Bernhard Voelker]

Follow-up Comment #4, bug #54730 (project findutils):

I agree.  I'm trying to find a good example.

What about the following?

  ---------------------------------------------------------------------------
  Find the name of a file in the current directory (and below) which contains
  the word "needle", and stop when the first such file is found.

    # Prepare 4 files, 2 of them contain the word "needle".
    $ touch a b c d    
    $ echo needle > b
    $ echo needle > dc

  Without -quit, 'find' would call 'grep' for every file (and there's
  currently no option to make 'grep' stop after a match across files):

    $ find -type f \
        -printf 'Checking: %p ...\n'  \
        -exec grep -FH needle '{}' \;
    Checking: ./c ...
    ./c:needle
    Checking: ./d ...
    Checking: ./a ...
    Checking: ./b ...
    ./b:needle

  With -quit, 'find' stops after the first match:

    $ find -type f \
        -printf 'Checking: %p ...\n' \
        -exec grep -FH needle '{}' \; \
        -quit
    Checking: ./c ...
    ./c:needle
  --------------------------------------------------------------------------




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