question in shell script

Hell guys,
I need a little help to solve this question

Write a Bourne shell script which:
� Has one command line argument.
� If the command line argument is a directory then the script should output the number of files in the directory.
� If the command line argument is an ordinary file then the script should output whether or not the file has execute permission for the file owner.
� If the command line argument is neither a file or directory then the script should output an appropriate error message.
� If no command line argument is supplied then the script should output an appropriate error message.

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