$3\mathrm{.}3.($Script $3)$ You are supposed to write a shell script that will count the number of files stored in the directory given as the script execution parameter. For test purposes, a test environment has been prepared in the script check system with some files. You must use loop instruction. Your script will be executed in the command line as:

scriptname dir$\_$name

Suppose you$$ve got the following directory structure:

A$-$

$-$a$.$txt $($size $5$ bytes$)$

$-$b$.$txt $($size $7$ bytes$)$

$-$c$.$txt $($size $1$ byte$)$

$-$d$.$txt $($size $4$ bytes$)$

For the example execution:

scriptname $./$A

your script should return $4.$

The only thing your script is expected to return is a number reflecting the total number of files in the given directory. Neither, runtime messages nor error messages should appear on the screen $($you may need to re$-$direct the standard error stream for operations that might be a source of any kind of error as $$command $2>/$dev$/$null$).$

Your solution will be marked concerning the correctness of the file counting operation.