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Count occurences of the word without it repeating


 
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Note: If you do not specify a field separator (FS) in awk, it uses the default of a single space (" "), which has a special meaning:
Quote:
If FS is <space>, skip leading and trailing <blank> and <newline> characters; fields shall be delimited by sets of one or more <blank> or <newline> characters.
The Open Group Base Specifications Issue 7, 2018 edition

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