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Search the forums. Exactly this question has been answered a few days ago.

find . -type f -name "*.csv" | wc -lThis gives only a number, and can be stored in a variable as you did.
But storing the list in a variable can lead to a "too long" error in the shell.

This give the number of csv files in current directory tree.

count=$( find . -type f -name "*.csv" | wc -l )
echo $count

Try this


filecount=$(find . -type f -name "*.csv" | wc -l)

using (n)awk:


# nawk 'NR==FNR{x[$1]=$2;next}{print x[$1]}' map infile
2
45
2
56
98
6598
98
56
56
98
98


HTH