Need help with Basic Unix Program

I am a newbie to UNIX. I'm learning UNIX on my own, just trying to get the jerk of how things work in UNIX environment. I am familiar with Windows environment.

Can anyone pls write simple 'envprint' programs to :
1) List all the environment Information (using the -l or --l options)
2) List only the names of environment variables (using the -n or --n options)
3) List all entries containing the (in 'value' part)VAL string (using the -s VAL or --search Val options)
4) List the value for each of the specified environment variables (without using any option )

Do not post classroom or homework problems in the main forums. Homework and coursework questions can only be posted in this forum under special homework rules.

Please review the rules, which you agreed to when you registered, if you have not already done so.

More-than-likely, posting homework in the main forums has resulting in a forum infraction. If you did not post homework, please explain the company you work for and the nature of the problem you are working on.

If you did post homework in the main forums, please review the guidelines for posting homework and repost.

Thank You.

The UNIX and Linux Forums.