Grepping for exact words with UNIX

Question

I want to search Exact word pattern in Unix. Example: Log.txt file contains following text:

aaa
bbb
cccaaa   ---> this should not be counted          


        

Answer 1

Word boundary matching is an extension to the standard POSIX grep utility. It might be available or not. If you want to search for words portably, I suggest you look into perl instead, where you would use

perl -ne 'print if /\baaa\b/' $EAT_Setup_BJ3/Log.txt