d. Write a shell script to count the number of accounts which belong to particular primary

guys,
I am new shelll scripting..
this a question on passt exam paper, I was trying to solve it , I can not.
the question is as follow?

a. Write a shell script to count the number of accounts which belong to particular primary group in a standard UNIX system which uses local authentication. The primary group should be supplied to the shell as parameter.
can anyone help.

Past exam paper or not, this looks like homework!

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