Don, I think you mean
grep reads from the pipe stream, and cannot see the file names.
It is equivalent to
where grep sees the file names and the -h prevents printing them as a prefix.
Unfortunately grep by default prefixes the file names when it has got two or more file names. But not with one file name.
And there is no option to enforce the prefix. Therefore the /dev/null trick: it is one more file name. Nothing is ever found there, but it enforces the prefix. For example
will prefix the file name even if the "$@" has only one argument (file name).
Hi MadeInGermany,
Yes. I agree with all of the above. Note that the code the user posted was:
and I was demonstrating how to get the same output. And, I later suggested using the /dev/null trick because I assume (without any indication from the original poster of this thread) that just having a list of matching lines without knowing what files they came from would not be very useful. I should have made clear in post #7 that the discussion I included in post #3 still applied.
Quote:
Originally Posted by cola
Are {} \+ and {} + same?
Yes. But {} ; cannot be used instead of {} \;. The semicolon has special meaning to the shell and must be escaped to make the shell pass the semicolon to find. The plus-sign is not special to the shell in this context, so it does not need to be escaped.
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