UNIX for Dummies Questions & Answers

I'm having trouble running this script. I'm new to Unix so be kind please.

#!/bin/sh

# Test to make sure only a single parameter is passed from the
# command line.
if [ "$#" -ne "1" ]
then
echo "Usage: AC.sh <directory>"
exit
fi

# Is the parameter a directory test
if [ ! -d $1 ]
then
echo "This is a directory."
else
echo "$1: No such directory."
exit
fi

if [ $? -eq 0 ]
then
echo $1 " is a directory."
elif [ $? -gt 0 ]
then
echo $1 " is not a directory."
fi

The script working but, I'm not sure if the result is the same as you want to reach?

No need to have the quotes in "$#" -ne "1"
if [ ! -d $1 ] here to have the quotes...for $1...

Kindly let me know what is the error u r getting...so that it will be easier to solve...

I'm sorry, I was copying code from my teacher's sample solution and I noticed he had more than what I pasted. Thanks for the help anyway. I'll be needing some more in the near future since exams are in 2 weeks. Thanks again.