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If you want to get a count of files containing a patterns "X" ,"Y" and "Z" execute the following awk command. Otherwise pls clarify your question.
awk -F"_" '$2 ~ /X/ { x++ }; $2 ~ /Y/ { y++ }; $2...

There is always another way in Linux ::)

x1="This is Kiran"
x2= `echo $x1 | awk '{ print $NF }'