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Reborg,
Using the same test data:

a aa aaa
aaa aa a
aaa aa a aaa aa a aaa

Using your solution to find the number of 'a' words:

awk 'BEGIN {RS="a" } END { print NR }' FILE

Gives total...

Using the same test data:

a aa aaa
aaa aa a
aaa aa a aaa aa a aaa

This solution does not work for the following case:

tr -s ' \011\012' '\n\n\n' < FILE | grep -c "a"

It gives the total...

This solution does not work.

Here is a sample file:

a aa aaa
aaa aa a
aaa aa a aaa aa a aaa


Here is one test:

tr -cs 'A-Za-z' '\n' < FILE | grep -c "aaa"


It gives the total of...