Web Reference: Jun 2, 2015 · Select only those matches that exactly match the whole line. For a regular expression pattern, this is like parenthesizing the pattern and then surrounding it with ^ and $. Now with grep we have an argument (-w) which is used to grep for exact match of whole word from a file. As you observe, it did filtered the output by removing non-relevant match although the grep was not 100% successful. From the man page of grep: Recently I came across an issue in grep. I was trying to match the pattern x.y.z and grep returned x.y-z.Using some regular expression we may can overcome this, but with grep whole word matching did not help.
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